Abstract:
Images may be automatically annotated with place identifiers based on textual metadata associated with the images. The quality of these place identifiers may be scored based on a number of different factors. For example, these annotations may also include confidence and topicality values indicative of the relationships between the place identifier and the text as well as topics of the text of the textual metadata. Images that also have additional location information that includes GPS coordinates or a location specified by a user, may be used to evaluate the quality of a given place identifier, combination of confidence and topicality values, and the overall annotation system. These valuations may, in turn, be used to score the quality of such automatic annotations of other images that do not have such additional location information.

Description:
BACKGROUND 
       [0001]    Various systems provide users with images of different locations, including panoramic images. For example, a panoramic image may include an image or collection of images having a field of view which is greater than that of the human eye, e.g., 180 degrees or greater. Some panoramic images may provide a 360-degree view of a location. 
         [0002]    Some systems allow users to view images in sequences, such as in time or space. In some examples, these systems can provide a navigation experience in a remote or interesting location. Some systems allow users to feel as if they are rotating within a virtual world by clicking on the edges of a displayed portion of a panorama and having the panorama appear to “rotate” in the direction of the clicked edge. 
       SUMMARY 
       [0003]    Aspects of the disclosure provide a computer implemented method for selecting time-distributed panoramas for display. The method includes accessing, by one or more computing devices, a plurality of panoramic images. Each given panoramic image of the plurality of panoramic images is associated with multi-dimensional location information defined in at least two dimensions, uni-dimensional (1D) location information defined in only one dimension, three dimensional (3D) geometry data corresponding to a surface of an object depicted in the given panoramic image, and time information identifying when the given panoramic image was captured. For a first one of the plurality of panoramic images that is associated with first multi-dimensional location information, first 1D location information, and first time information, the one or more computing devices select a second panoramic image of the plurality of panoramic images. The second panoramic image panoramic image is associated with second multi-dimensional location information, second 1D location information, and second time information. The second panoramic image is selected such that the second 1D location information is closest to the first 1D location information and the first time information and second time information indicate that the first panoramic image and the second panoramic image were captured on different days. The one or more computing devices provide the first panoramic image for display with an indication that the second panoramic image is available. The one or more computing devices also determine a zoom level for the second panoramic image based on the first 3D geometry data, the first multi-dimensional location information, the second 3D geometry data, and the second multi-dimensional location information. The one or more computing devices provide the second panoramic image for display with the zoom level for the second panoramic image. 
         [0004]    In one example, the method also includes receiving view port information identifying a viewing angle of a display of the first panoramic image and a zoom level of the display of the first panoramic image. In this example, determining the zoom level for the second panoramic image further includes identifying a first distance to a three dimensional point on a surface of an object in the viewing angle of the display of the first panoramic image based on the first 3D geometry data, the first multi-dimensional location information, and the zoom level of the display of the first panoramic image; identifying a second distance to the three dimensional point on the surface of the object in the second panoramic image based on the first location information and the second 3D geometry data; and determining the zoom level for the second panoramic image using at least the first distance and the second distance. In addition, determining the zoom level for the second panoramic image is further based on a ratio of the first distance to the second distance. Also, the second distance is a linear distance between the three dimensional point and the second location information. In some examples, when the zoom level of the display of the first panoramic image indicates that the first panoramic is not zoomed in, the first distance is a linear distance between the first location of the first panoramic image and the three dimensional point on the surface of the object in the viewing angle of the display of the first panoramic image. In other such examples, the view port information further identifies a viewing angle of a display of the first panoramic image, and the method also includes determining a viewing angle of the second panoramic image based on the viewing angle and the viewing angle for the second panoramic image is provided with the second panoramic image. In another example, the 1D location information associated with each particular panoramic image of the plurality of panoramic images is defined relative to a point on a line corresponding to a portion of road. 
         [0005]    Another aspect of the disclosure provides a system comprising one or more computing devices. The one or more computing devices are configured to access a plurality of panoramic images. Each given panoramic image of the plurality of panoramic images being associated with multi-dimensional location information defined in at least two dimensions, uni-dimensional (1D) location information defined in only one dimension, three dimensional (3D) geometry data corresponding to a surface of an object depicted in the given panoramic image, and time information identifying when the given panoramic image was captured. For a first one of the plurality of panoramic images associated with first multi-dimensional location information, first 1D location information, and first time information, the one or more computing devices are configured to select a second panoramic image of the plurality of panoramic images. The second panoramic image panoramic image is associated with second multi-dimensional location information, second 1D location information, and second time information. The second panoramic image is selected such that the second 1D location information is closest to the first 1D location information and the first time information and second time information indicate that the first panoramic image and the second panoramic image were captured on different days. The one or more computing devices are also configured to provide the first panoramic image for display with an indication that the second panoramic image is available and determine a zoom level for the second panoramic image based on the first 3D geometry data, the first multi-dimensional location information, the second 3D geometry data, and the second multi-dimensional location information. The one or more computing devices are also configured to provide the second panoramic image for display with the zoom level for the second panoramic image. 
         [0006]    In one example, the one or more computing devices are further configured to receive view port information identifying a viewing angle of a display of the first panoramic image and a zoom level of the display of the first panoramic image. In this example, the one or more computing devices are configured to determine the zoom level for the second panoramic image by also identifying a first distance to a three dimensional point on a surface of an object in the viewing angle of the display of the first panoramic image based on the first 3D geometry data, the first multi-dimensional location information, and the zoom level of the display of the first panoramic image; identifying a second distance to the three dimensional point on the surface of the object in the second panoramic image based on the first location information and the second 3D geometry data; and determining the zoom level for the second panoramic image using at least the first distance and the second distance. In this example, determining the zoom level for the second panoramic image is further based on a ratio of the first distance to the second distance. Also, the second distance is a linear distance between the three dimensional point and the second location information. In some examples, when the zoom level of the display of the first panoramic image indicates that the first panoramic is not zoomed in, the first distance is a linear distance between the first location of the first panoramic image and the three dimensional point on the surface of the object in the viewing angle of the display of the first panoramic image. In other such examples, the view port information further identifies a viewing angle of a display of the first panoramic image, and the one or more computing devices are also configured to determine a viewing angle of the second panoramic image based on the viewing angle and the viewing angle for the second panoramic image is provided with the second panoramic image. In another example, the 1D location information associated with each particular panoramic image of the plurality of panoramic images is defined relative to a point on a line corresponding to a portion of road. 
         [0007]    A further aspect of the disclosure provides a non-transitory computer-readable storage medium on which computer readable instructions of a program are stored. The instructions, when executed by one or more processors, cause the one or more processors to perform a method. The method includes accessing a plurality of panoramic images. Each given panoramic image of the plurality of panoramic images being associated with multi-dimensional location information defined in at least two dimensions, uni-dimensional (1D) location information defined in only one dimension, three dimensional (3D) geometry data corresponding to a surface of an object depicted in the given panoramic image, and time information identifying when the given panoramic image was captured. For a first one of the plurality of panoramic images associated with first multi-dimensional location information, first 1D location information, and first time information, the method includes selecting a second panoramic image of the plurality of panoramic images. The second panoramic image panoramic image being associated with second multi-dimensional location information, second 1D location information, and second time information, the second panoramic image being selected such that the second 1D location information is closest to the first 1D location information and the first time information and second time information indicate that the first panoramic image and the second panoramic image were captured on different days. The method also includes providing the first panoramic image for display with an indication that the second panoramic image is available and determining a zoom level for the second panoramic image based on the first 3D geometry data, the first multi-dimensional location information, the second 3D geometry data, and the second multi-dimensional location information. The method also includes providing the second panoramic image for display with the zoom level for the second panoramic image. 
         [0008]    In one example, the method also includes receiving view port information identifying a viewing angle of a display of the first panoramic image and a zoom level of the display of the first panoramic image. In this example, determining the zoom level for the second panoramic image also includes identifying a first distance to a three dimensional point on a surface of an object in the viewing angle of the display of the first panoramic image based on the first 3D geometry data, the first multi-dimensional location information, and the zoom level of the display of the first panoramic image; identifying a second distance to the three dimensional point on the surface of the object in the second panoramic image based on the first location information and the second 3D geometry data; and determining the zoom level for the second panoramic image using at least the first distance and the second distance. In addition, determining the zoom level for the second panoramic image is further based on a ratio of the first distance to the second distance. Also, the second distance is a linear distance between the three dimensional point and the second location information. In other such examples, when the zoom level of the display of the first panoramic image indicates that the first panoramic is not zoomed in, the first distance is a linear distance between the first location of the first panoramic image and the three dimensional point on the surface of the object in the viewing angle of the display of the first panoramic image. In another example, the view port information further identifies a viewing angle of a display of the first panoramic image, and the method also includes determining a viewing angle of the second panoramic image based on the viewing angle and the viewing angle for the second panoramic image is provided with the second panoramic image. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0009]      FIG. 1  is a functional diagram of an example system in accordance with aspects of the disclosure. 
           [0010]      FIG. 2  is a pictorial diagram of the example system of  FIG. 1 . 
           [0011]      FIG. 3A  is an example diagram of image collection locations in accordance with aspects of the disclosure. 
           [0012]      FIG. 3B  is an example diagram of data in accordance with aspects of the disclosure. 
           [0013]      FIG. 3C  is another example diagram of data locations in accordance with aspects of the disclosure. 
           [0014]      FIG. 4  is an example diagram of repositioning some of the collection locations of  FIG. 3A  in one dimension in accordance with aspects of the disclosure. 
           [0015]      FIG. 5  is an example screen shot of a portion of a panoramic image in accordance with aspects of the disclosure. 
           [0016]      FIG. 6  is an example screen shot of a portion of a panoramic image and a thumbnail image in accordance with aspects of the disclosure. 
           [0017]      FIG. 7  is another example screen shot of a portion of a panoramic image and a thumbnail image in accordance with aspects of the disclosure. 
           [0018]      FIG. 8  is an example diagram of determining corresponding orientations and zoom levels in accordance with aspects of the disclosure. 
           [0019]      FIG. 9  is a flow diagram in accordance with aspects of the disclosure. 
       
    
    
     DETAILED DESCRIPTION 
     Overview 
       [0020]    The technology relates to selecting and displaying panoramic images captured at different points in time. As an example, a user of a computing device (e.g., a smart phone, laptop, or other personal computing device) may view a street level panoramic image oriented in a particular direction. The computing device may display a “view port” or a portion of the panoramic image that includes various objects that appear to be at a particular distance from the user. The user may also want to view another panoramic image of those objects that was captured at a different point in time. From the user&#39;s perspective, he or she may select an option to switch to another panoramic image captured at a different point in time. In response, the user experiences a smooth transition from one panoramic image to another captured at a different point in time which feels like to the user was taken from the same position as the view port of the original panoramic image. 
         [0021]    In order to provide the user with another panoramic image as described above, a plurality of such street level panoramic images may be accessed. Each of these panoramic images may have been captured by a camera device mounted on a vehicle as the vehicle is driven along a street. In other examples, the panoramic images may be collected by a person using a camera rig attached to a backpack (e.g., for paths and other non-street areas), a smartphone camera, camera, etc. As the panoramic image is captured, the camera device, or another device, may identify and associate location and orientation information corresponding to a two or three dimensional (2D or 3D) location of the panoramic image. This location and orientation information may also be processed to reduce noise in the raw data. This processed (or unprocessed) location and orientation information may be referred to as the “actual” location of the panoramic image. 
         [0022]    In addition to the image and actual location, each panoramic image may also be associated with 3D geometry data corresponding to points on the surface of any objects in that panoramic image. For example, as a vehicle is driven along the street, a LIDAR system may be used to collect laser data or light intensity information which is converted into three dimensional points on the surface of objects. These objects will correspond to objects that are included in a panoramic image that was captured at approximately the same location as the laser data. 
         [0023]    Each panoramic image may be processed in order to identify a second location for that image. This second location may correspond to a location along a line through the center or nearly the center of the street along which the vehicle was driven or a “snap” location. This snap location may be defined in a single dimension (1D) along the line through the center of the street. 
         [0024]    For a first panoramic image, nearby panoramic images captured at a different point in time, for example on one or more different collection dates, may be selected by querying a plurality of images to identify an image that was both captured at the different point(s) in time and has a snap location that is closest to the snap location of the first panoramic image. Here, the different point in time refers to two different passes near the location of the given panoramic image. 
         [0025]    Once a second panoramic image is selected, a link between the first panoramic image and the second panoramic image may be established. Thus, when a user views the first panoramic image, he or she may be provided with an option to view, for example in a thumbnail view, the second panoramic image in conjunction with the first panoramic image or to switch to a view of the second panoramic image. In this example, the second panoramic image may be selected in advance, that is before the user has requested to view the first panoramic image. Alternatively, the selection may be performed in real time (e.g., without delay and in response to the request to view the first panoramic image) in order to keep the closest available panoramic images up to date as the plurality of panoramic images may change over time as additional images are collected. 
         [0026]    The view port of the first panoramic image may be used to determine how to display the second panoramic image. For example, the displayed orientation of the view port of the second panoramic image may be selected in order to correspond to the orientation of the view port of the second panoramic image. In addition, the three dimensional geometry data associated with the first panoramic image may be used to determine the distance between the point of view of the view port and an object. For instance, where there is no zoom, the point of view would be the actual location of the first panoramic image. This distance and the three dimensional geometry data associated with the second image are then used to adjust the zoom of the second panoramic image when the second panoramic image is displayed. In this regard, the second panoramic image may be displayed such that objects in the second panoramic image will appear to be the same distance from the user as those same objects in the view port of the first panoramic image. 
         [0027]    The features described above simplify the selection and display of other panoramic images from different points in time. For example, it is significantly more efficient to search for images in a single direction using a snap location than using an actual two or three dimensional location. In addition, if the second panoramic image was displayed from the view point at which the second panoramic image was captured, if the images were captured at different sides of the road, switching to the second panorama could be fairly jarring to the user. 
       Example Systems 
       [0028]      FIGS. 1 and 2  include an example system  100  in which the features described herein may be implemented. It should not be considered as limiting the scope of the disclosure or usefulness of the features described herein. In this example, system  100  can include one or more computing devices  110 ,  120 ,  130 , and  140 , storage system  150 , as well as collection devices  160  and  170 . One or more computing devices  110  can contain one or more processors  112 , memory  114  and other components typically present in general purpose computing devices. Memory  114  of the one or more computing devices  110  can store information accessible by one or more processors  112 , including instructions  116  that can be executed by the one or more processors  112 . 
         [0029]    Memory can also include data  118  that can be retrieved, manipulated or stored by the processor. The memory can be of any non-transitory type capable of storing information accessible by the processor, such as a hard-drive, memory card, ROM, RAM, DVD, CD-ROM, write-capable, and read-only memories. 
         [0030]    The instructions  116  can be any set of instructions to be executed directly, such as machine code, or indirectly, such as scripts, by the processor. In that regard, the terms “instructions,” “application,” “steps” and “programs” can be used interchangeably herein. The instructions can be stored in object code format for direct processing by the processor, or in any other computing device language including scripts or collections of independent source code modules that are interpreted on demand or compiled in advance. Functions, methods and routines of the instructions are explained in more detail below. 
         [0031]    Data  118  can be retrieved, stored or modified by processor  112  in accordance with the instructions  116 . For instance, although the subject matter described herein is not limited by any particular data structure, the data can be stored in computer registers, in a relational database as a table having many different fields and records, or XML documents. The data can also be formatted in any computing device-readable format such as, but not limited to, binary values, ASCII or Unicode. Moreover, the data can comprise any information sufficient to identify the relevant information, such as numbers, descriptive text, proprietary codes, pointers, references to data stored in other memories such as at other network locations, or information that is used by a function to calculate the relevant data. 
         [0032]    The one or more processors  112  can include any conventional processors, such as a commercially available CPU. Alternatively, the processor can be a dedicated component such as an ASIC or other hardware-based processor. Although not necessary, one or more computing devices  110  may include specialized hardware components to perform specific computing processes, such as decoding video, matching video frames with images, distorting videos, encoding distorted videos, etc. faster or more efficiently. 
         [0033]    Although  FIG. 1  functionally illustrates the processor, memory, and other elements of computing device  110  as being within the same block, the processor, computer, computing device, or memory can actually comprise multiple processors, computers, computing devices, or memories that may or may not be stored within the same physical housing. For example, the memory can be a hard drive or other storage media located in one or more housings different from those of the one or more computing devices  110 . Accordingly, references to a processor, computer, computing device, or memory will be understood to include references to a collection of processors, computers, computing devices, or memories that may or may not operate in parallel. For example, the computing devices  110  may include server computing devices operating as a load-balanced server farm. Yet further, although some functions described below are indicated as taking place on a single computing device having a single processor, various aspects of the subject matter described herein can be implemented by a plurality of computing devices, for example, communicating information over network  180 . 
         [0034]    The one or more computing devices  110  can be at various nodes of a network  180  and capable of directly and indirectly communicating with other nodes of network  180 . Although only a few computing devices are depicted in  FIGS. 1-2 , it should be appreciated that a typical system can include a large number of connected computing devices, with each different computing device (as well as collection device) being at a different node of the network  180 . The network  180  and intervening nodes described herein can be interconnected using various protocols and systems, such that the network can be part of the Internet, World Wide Web, specific intranets, wide area networks, or local networks. The network can utilize standard communications protocols, such as Ethernet, WiFi and HTTP, protocols that are proprietary to one or more companies, and various combinations of the foregoing. Although certain advantages are obtained when information is transmitted or received as noted above, other aspects of the subject matter described herein are not limited to any particular manner of transmission of information. 
         [0035]    As an example, the one or more computing devices  110  may include one or more web servers that are capable of communicating with storage system  150  as well as computing devices  120 ,  130 , and  140  via the network. For example, one or more server computing devices  110  may use network  180  to transmit and present information to a user, such as user  220 ,  230 , or  240 , on a display, such as displays  122 ,  132 , or  142  of computing devices  120 ,  130 , or  140 . In this regard, computing devices  120 ,  130 , and  140  may be considered client computing devices and may perform all or some of the features described below. 
         [0036]    Each of the client computing devices may be configured similarly to the server computing devices  110 , with one or more processors, memory and instructions as described above. Each client computing device  120 ,  130  or  140  may be a personal computing device intended for use by a user  220 ,  250 ,  250 , and have all of the components normally used in connection with a personal computing device such as a central processing unit (CPU), memory (e.g., RAM and internal hard drives) storing data and instructions, a display such as displays  122 ,  132 , or  142  (e.g., a monitor having a screen, a touch-screen, a projector, a television, or other device that is operable to display information), and user input device  124  (e.g., a mouse, keyboard, touch-screen or microphone). The client computing device may also include a camera for recording video streams, speakers, a network interface device, and all of the components used for connecting these elements to one another. 
         [0037]    Although the client computing devices  120 ,  130  and  140  may each comprise a full-sized personal computing device, they may alternatively comprise mobile computing devices capable of wirelessly exchanging data with a server over a network such as the Internet. By way of example only, client computing device  120  may be a mobile phone or a device such as a wireless-enabled PDA, a tablet PC, or a netbook that is capable of obtaining information via the Internet. In another example, client computing device  130  may be a head-mounted computing system. As an example the user may input information using a small keyboard, a keypad, microphone, using visual signals with a camera, or a touch screen. 
         [0038]    Storage system  150  may store various types of information. As described in more detail below, the storage system  150  may store images, such as those described above as having a field of view which is greater than that of the human eye, e.g., 180 degrees or greater. In that regard, example panoramic images described herein provide a 360-degree view of a location, though other types of images may also be used. In addition, each panoramic image may be associated with geographic location information indicating the location and, in some cases, the orientation at which the panoramic image was captured (e.g., which part of the panoramic image is oriented towards “North”, etc.) as well as timestamp information indicating the date and time at which the panoramic image was captured. 
         [0039]    The storage system  150  may also store 3D geometry data. As explained above and described in more detail below, this 3D geometry data may correspond to points on the surface of any objects in the plurality of panoramic image. The 3D geometry data may provide the position (x,y,z) of points relative to a particular coordinate system (e.g. relative to a position of a LIDAR system that generated the geometry data or a global positioning system (GPS) such as latitude, longitude, and altitude coordinates). 
         [0040]    Storage system  150  may also store map information. The map information may be an image based map or may include a plurality of vectors used to identify the shape, orientation, and other characteristics of streets used to display a map. In this regard, the streets may be divided into discrete road segments. As an example, collection of such road segments (or vectors) may be used to display a map. 
         [0041]    As with memory  114 , storage system  150  can be of any type of computerized storage capable of storing information accessible by server  110 , such as a hard-drive, memory card, ROM, RAM, DVD, CD-ROM, write-capable, and read-only memories. In addition, storage system  150  may include a distributed storage system where data is stored on a plurality of different storage devices which may be physically located at the same or different geographic locations. Storage system  150  may be connected to the computing devices via the network  180  as shown in  FIG. 1  and/or may be directly connected to or incorporated into any of the computing devices  110 - 140  (not shown). 
         [0042]    Collection devices  160  and  170  may include a computing device, configured similarly to one of the server computing devices or client computing devices with a processor and memory storing data and instructions (not shown in  FIG. 1  for simplicity). Collection devise  160  and  170  may also provide all or some of the images of storage system  150 . Each of the collection devices  160  and  170  may include a camera or other information collection device. For example, collection device  160  may include a camera  162  mounted on a vehicle. As the vehicle is driven along a street, the camera of collection device  160  may capture panoramic images. In this regard, all or some of the panoramic images of storage system  150  may be considered “street level images.” As another example, collection device  170  may include a camera rig attached to a backpack (e.g., for paths and other non-street areas), a smartphone camera, a dedicated camera device, etc. which a person walks, bikes, or otherwise moves around with in order to capture panoramic images. In addition to capturing images, the collection devices and/or camera may be configured to provide each panoramic image with a timestamp indicating the date and time at which the image was captured. The captured panoramic images and timestamps may be uploaded or downloaded to the storage system  150 . 
         [0043]    Each of collection devices  160  or  170  may include a position system  164  in order to determine the camera&#39;s relative or absolute position on a map or on the Earth when an image is captured. For example, the position system  164  may include a GPS receiver to determine the device&#39;s latitude, longitude and/or altitude position and provide a two or three dimensional (2D or 3D) location at which each panoramic image was captured by the collection device. Other location systems such as laser-based localization systems, inertial-aided GPS, trilateration/triangulation, or camera-based localization may also be used to identify the location of the vehicle. The location of the vehicle may include an absolute geographical location, such as latitude, longitude, and altitude as well as relative location information, such as location relative to other cars immediately around it which can often be determined with less noise than an absolute geographical location. 
         [0044]    The positioning system  164  may also include other devices in communication with the camera or collection device, such as an accelerometer, gyroscope or another direction/speed detection device to determine the orientation of the camera  162  when the panoramic image was captured. By way of example only, an acceleration device may determine its pitch, yaw or roll (or changes thereto) relative to the direction of gravity or a plane perpendicular thereto. The device may also track increases or decreases in speed and the direction of such changes. 
         [0045]    The collection device&#39;s provision of location and orientation data as set forth herein may be associated with the panoramic images as they are being captured and provided automatically to the storage system  150 , other computing devices and combinations of the foregoing. Although camera  162  and position system  164  are depicted within the collection device  160 , these components may or may not be included in the same physical housing. In this regard, the position system  164  may be a different device from the camera  162  such that both components output the 2D or 3D location information and orientation information and panoramic images to the collection device which processes these outputs in order to associate them with one another and provide them to the storage system  150 . 
         [0046]    In some examples, the collection device  160  may include a LIDAR system  166  for generating the 3D geometry data described above. For example, as a vehicle is driven along the street, a LIDAR system may be used to collect laser data or light intensity information which is converted into three dimensional points on the surface of objects. These objects will correspond to objects that are included in a panoramic image that was captured by a camera, such as camera  162 , at approximately the same geographic location as the laser data. 
       Example Methods 
       [0047]    In order to provide a user with images, a first plurality of panoramic images (at least some of which are street level images) may be captured and stored. As noted above, these images may be captured by a camera mounted on a vehicle (or other device). In this regard, panoramic images may be captured in a sequence as the camera is moved along. Each panoramic image may be associated with 2D or 3D location and orientation information corresponding to the geographic location where the panoramic image was captured as well as a timestamp indicating the date and time when the image was captured. For example, as a collection device such as collection device  160  is moved around, such as by driving a vehicle along a street, camera  162  may capture panoramic images. At the same time, the position system  164  may provide GPS coordinates for each panoramic image captured by camera  162 . Each time the collection device  160  captures a series of images may be considered a separate “run.” 
         [0048]      FIG. 3A  is an example diagram  300  of a birds-eye view of a portion of a street  302  including six lanes  304 ,  306 ,  308 ,  312 ,  314 , and  316 . The six lanes are divided into two sections by double lane lines  310 . Those appearing above double lane lines  310  are westbound lanes, while those below are eastbound. In this example, the circles correspond to the 2D locations (x,y) of street level images. These circles are arranged into five different runs  320 - 328 . Again, each run may correspond to a path taken by a collection device as the panoramic images of that run were captured. In this example, runes  320 ,  322 , and  324  appear in the westbound lanes  304 ,  306 , and  308 , while runs  326  and  328  appear in the eastbound lanes  312  and  314  (but not  316 ). Here, the street level panoramic images of run  320  were collected by camera  162  of collection device  160  as the vehicle was driven along lane  304  of street  302 . The panoramic images of runs  322 - 328  may have been collected by the same or a different collection device, but were each collected on different dates and times from one another. In the example of  FIG. 3A , different runs occur in different lanes for clarity, but this does not necessarily need to be the case. Multiple runs (e.g.,  320 ,  322 ) could appear in the same lane (e.g.,  306 ). 
         [0049]    As the panoramic images are collected during the different runs, 3D geometry data corresponding to objects in those images may also be collected. For example, as collection device  160  is driven along the street  302 , LIDAR system  166  may be used to collect laser data or light intensity information corresponding to the surfaces of buildings  330 - 338 . As noted above, this information is converted into three dimensional points on the surface of those buildings. Thus, this information may describe objects that are included in the panoramic image that was captured at approximately the same location as the laser data, or rather any of the panoramic images of runs  320 - 328 . Though not required, each run may be associated with its own 3D geometry data. This 3D geometry data may be associated with individual street level panoramic images or runs, or the 3D geometry data may be retrieved using the 2D or 3D location information for a panoramic image. 
         [0050]    In some instances, because of the noise inherent in the GPS coordinates, this information may also be processed in order to reduce noise in the raw data. For example, the laser data, for example generated by a LIDAR system, may be used to shift, confirm, or otherwise correct the GPS coordinates. Example  340  of  FIG. 3B  depicts two different runs through the same area (e.g., along the same portion of roadway, but not necessarily in the same lane of traffic). The first run includes 3D geometry data corresponding to the façades of buildings represented by lines  342  and  344 . The first run also include a plurality of GPS coordinates shown as open circles  346 . The second run includes 3D geometry data corresponding to the façades of buildings represented by lines  352  and  345 . The second run also include a plurality of GPS coordinates shown as solid circles  356 . Data from these two runs may then be shifted relative to one another as shown in example  350  of  FIG. 3C . Here, the lines  342  and  344  and/or lines  352  and  354  are shifted so that they align with one another. In addition, the GPS coordinates of each shifted run may also be shifted so that they remain the same relative distance from the lines corresponding to the 3D geometry data for that shifted run. This processed (or in some examples, unprocessed) location and orientation information may be referred to as the “actual” location of the panoramic image. 
         [0051]    Each panoramic image may also be processed in order to identify another location for that image which can be represented in one dimension (1D). For example, this second location may correspond to a location along a line through the center or nearly the center of the street along which the vehicle was driven or a “snap” location. The line may correspond to a road segment of the map information stored in storage system  150 . In other words, the 2D or 3D location of an image is snapped to a 1D location on the road segment. In this regard, the snap location may be defined in a single dimension along the road segment or rather the line through the street. 
         [0052]    Typically, the snap location of an image may be determined by identifying the location of a closest road segment in the map to the 2D or 3D location of a panoramic image. Where the map information has more complex arrangements of road segments (e.g., such as where the closest road segment may actually correspond to a different street), the snap location of an image may be determined based on the most likely snapped position of other images that were captured in that same run. In this regard, even if a single image is closer to a first road segment, it may be snapped to a different road segment if the images captured in the run before and/or after that image were all snapped to the different road segment. 
         [0053]      FIG. 4  is an example diagram  400  which depicts the snapping of a small number of images of the runs of  FIG. 3A  to a road segment  420  corresponding to a portion of street  302 . In this example, panoramic images  402 - 410  of runs  320 - 328 , respectively, are snapped to the closest location along road segment  420 , or locations  430 - 434 . In this regard, a 1D location corresponding to the positions of location  430 - 434  along road segment  420  is identified for each of panoramic images  402 - 410 . The other images of the runs  320 - 328  may also each be snapped to road segment  420  in order to identify a 1D location for those panoramic images as well. 
         [0054]    The 1D snap locations identified as discussed above may be used by the one or more server computing devices to select one or more panoramic images that was captured at approximately the same location but at different points in time. Here, a different point in time refers to two different runs near the location of a given panoramic image. In this regard, given a 1D snap location of a first panoramic image, other panoramic images of the storage system  150  may be queried by the one or more server computing devices  110  in order to identify a second panoramic image having a 1D snap location that is both closest to the 1D snap location of the first panoramic image and has a timestamp which indicates that the second image was captured on a different day (e.g., during a different run) than the first panoramic image. In some instances if the closest panoramic image for a different run is greater than a specified distance, for example, 15 meters or more or less, than no second panoramic images may be selected for that run. 
         [0055]    If there are multiple other runs for a given road segment, (e.g., one in August 2011, one in September 2012, etc.), the panoramic images associated with such runs (as identified by the timestamps) may be queried in groups such that a closest panoramic image along the road segment may be identified for each individual run. In this regard, a plurality of such second images, one for each run, may be selected based on a particular first image. Returning to the example of  FIG. 4 , if panoramic image  402  is a first panoramic image, a second panoramic image may be identified for each of runs  322 - 328  as each of these runs were each collected on different dates and times from one another, and also from run  320  during which panoramic image  402  was captured. Each of panoramic images  402 ,  406 ,  408 ,  410 , and  412  may be selected as a second panoramic image for panoramic image  402  as they would have the closes 1D snap locations for each respective run to the 1D snap location of panoramic image  402 . 
         [0056]    Any such second panoramic images may be provided for display to a user in conjunction with the first panoramic image. For example, a user, such as user  220 , may make a request to view the first panoramic image using a client computing device, such as client computing device  120 , by selecting an option to view the first panoramic image, by searching for the first panoramic image by entering a particular location into a search engine, selecting a point on a map corresponding to the 2D or 3D location of the first panoramic image, or in other conventional way. In response, the client computing device may send a request for or identify the first panoramic image to the one or more server computing devices  110 . 
         [0057]    The one or more server computing devices may receive the request to identify any second panoramic images for the first panoramic image. In one example, any selected second panoramic images described above may be associated with the first panoramic image such that the server computing device  110 , may use the first panoramic image to retrieve any second panoramic images. Thus, any second panoramic images may be selected in advance by the one or more server computing devices, that is, before the user has requested to view the first panoramic image. Alternatively, the selection may be performed in real time (e.g., without delay and in response to the request for or identifying the first panoramic image) in order to keep the closest available panoramic images up to date. This may be especially useful as the plurality of panoramic images of the storage system  150  may change over time as additional images are collected. 
         [0058]    Once identified, the one or more server computing devices may provide the first panoramic image as well as an option to view any of the identified second panoramic images for display. For instance, when a user views the first panoramic image, he or she may be provided with an option to view one or more second panoramic images in conjunction with the first panoramic image or to switch to a view of one of the second panoramic images. In some examples, any second panoramic images, although not immediately displayed may also be provided to the client computing device, before the user has selected the option, in order to allow the client computing device to display them more quickly. 
         [0059]      FIG. 5  is an example screen shot  500  which may be displayed to a user, such as user  220 , on a display of a client computing device, such as display  122  of client computing device  120 . In this example, the screen shot  500  includes a display of a portion of the panoramic image  502 , or a view port. This view port includes a particular orientation and zoom level which allows the user to view portions of buildings  504 ,  506 , and  508 . In this example, panoramic image  502  may be considered a first panoramic image as described above. The screen shot  500  also includes display box  510  which includes a first part with a clock icon  512  that indicates that a second panoramic image is available for the panoramic image  502 . Display box  510  also includes other information such as location data  514  identifying an approximate location of the portion of the panoramic image  502 . 
         [0060]    By selecting the option to view a second panoramic image, the user may be provided with a display of a portion of a second panoramic image. For example, as shown in example screen shot  600  of  FIG. 6 , once a user has selected clock icon  512 , the display box  510  changes to include a time window  602 . Time window  602  includes a portion (e.g., a thumbnail image) of a second panoramic image  604  that was selected for panoramic image  502 . In this example, the portion of panoramic image  604  includes buildings  620 ,  622 , and  624 . Here, buildings  624  and  620  may correspond to buildings  504  and  508 , respectively of panoramic image  502 . However, building  622  does not correspond to building  510 , as in this example building  622  did not exist at the time that panoramic image  502  was captured. Rather, at the time panoramic image  502  was captured, building  622  was replaced by building  510 . 
         [0061]    Time window  602  also includes a slider bar  606  or other selection arrangements which provides a number of different functions. In this example, slider bar  606  indicates the quantity of available second panoramic images for the panoramic image  502 . As there are three points  608 ,  610 , and  612  on the slider bar, this may indicate that there are panoramic images from at least two different runs or dates in time that correspond to the location of panoramic image  502 . For example, point  608 , as it is slightly larger than points  610  and  612 , may indicate that panoramic image  604  was captured in 2007 and, assuming that the user was viewing the most recent panoramic image, point  612  may indicate that panoramic image  502  was captured in 2011. Point  610  may further indicate that another image, captured sometime between 2007 and 2011 is also available for viewing by the user. Thus, my manipulating the slider bar, the user may view other available panoramic images, including the panoramic image corresponding to point  610  as well as panoramic image  502  (corresponding to point  612 ) in the time window. Of course, other slider bars may include fewer points than available panoramic images such that locations along the slider bar between points may also correspond to available panoramic images, and other such mechanisms may be used to indicate to the user that second panoramic images are available. 
         [0062]    As noted above, the user may also switch between the second panoramic images and the first panoramic image. For example, a user may simply select the panoramic image displayed in the time window  602  or one of the points of slider bar  606  using mouse pointer, finger and touchscreen. In response, the client computing device may transition from a display of the first panoramic image to a display of the selected second panoramic image. In between, if needed, the client computing device may request the second paranoiac image from the one or more server computing devices as well. 
         [0063]    As shown in the example screen shot  700  of  FIG. 7 , user  220  may select the panoramic image  604  and the display of the portion of panoramic image  502  transitions to, for example by simply switching or fading or by using some other transition mechanism, a display of the panoramic image  604 . 
         [0064]    The orientation and zoom level, or view port information, of the first panoramic image may be used to determine how to display the second panoramic image. For example, the displayed orientation of the second panoramic image may be selected in order to correspond to that of the first panoramic image. In addition, the three dimensional geometry data associated with the first panoramic image may be used to determine the distance between the point of view of the view port (e.g., where there is no zoom, the point of view would be the actual location of the first panoramic image) to an object. This distance and the three dimensional geometry data associated with the second image are then used to adjust the zoom of the second panoramic image when the second panoramic image is displayed. In this regard, the second panoramic image may be displayed such that objects in the second panoramic image will appear to be the same distance from the user as those same objects in the view port of the first panoramic image. For example, as can be seen from screen shot  600  of  FIG. 6 , the displayed portion of panoramic image  502  corresponds to the displayed portion of panoramic image  604 . In this regard, both the orientations of the panoramic images are corresponding as well as the zoom levels, even though they are not necessarily the same. 
         [0065]    For example, two corresponding orientations may either be identical or may be slightly different depending on the 2D or 3D location of each panoramic image. Referring to the example diagram  800  of  FIG. 8 , a user may be viewing panoramic image  406  oriented in a direction corresponding to South or some particular degree (e.g., 180 degrees from North, etc.) along line  802  at some zoom level z. Thus, the view port information for the panoramic image  406  in this example would include the orientation South and zoom level z. In this regard, the center point (or pixel) of the portion of panoramic image  406  that is displayed corresponds to the location of three dimensional point  804  on building  336 . 
         [0066]    If panoramic image  402  is available as a second panoramic image, a corresponding orientation may be selected by using the same orientation or south along dashed line  806 . Alternatively, the orientation may be selected such that the center point (or pixel) of the portion of panoramic image  406  that is displayed corresponds to the three dimensional point  804  on building  336 . This may be determined, for example, by using the 3D geometry data collected during each of runs  320  and  324  to identify the 3D location of point  804  as well as the 2D or 3D locations of panoramic images  402  and  406  to determine the angle α between dashed line  806  and solid line  808 . The orientation of panoramic image  406  may then be adjusted using the angle α in order to determine a corresponding orientation for panoramic image  402 . For example, as he the dashed line  806  is oriented clockwise from the solid line  808  if the orientation H of panoramic image  406  is in degrees and a is in degrees, a may be subtracted from H (or be made a negative value and added to H) to provide the orientation for panoramic image  402 . As another example, if the dashed line  806  were oriented counterclockwise from the solid line  808 , a may be made negative and subtracted from H (or be made added to H) to provide the orientation. If the orientation of the first panoramic image displayed to the user is expressed in two dimensions (e.g. a point on a sphere), the same or similar calculations may be performed in two dimensions to determine the orientation of the second panoramic image. 
         [0067]    A corresponding zoom level for the second panoramic image may also be determined. For example, referring again to  FIG. 8 , the distance along line  802 , D 1 , between the 2D or 3D location of panoramic image  406  and the 3D location of point  804  may be determined. Again, the center point (or pixel) of the portion of panoramic image  406  that is displayed corresponds to the location of three dimensional point  804  on building  336 . Similarly, the distance along line  808 , D 2 , between the 2D or 3D location of panoramic image  402  and the 3D location of point  804  may also be determined. A ratio of these two distances (D 2 /D 1 ) may provide a zoom value. Applying this zoom value to the zoom level of the display of panoramic image  406 , for example by multiplying (z*D 2 /D 1 ) may provide a zoom level for panoramic image  402 . In this regard if the zoom level of panoramic image  406  is 1, such that point  804  appears to be a distance D 1  from the user, than the zoom level for panoramic image  406  would be D 2 /D 1 . 
         [0068]    The corresponding orientation and zoom level may be determined by the one or more server computing devices or in real time by the client computing device. For example, the client computing device  120  may send the view port information to the one or more server computing devices when the user selects the option to view any second panoramic images (such as clock icon  512  of  FIG. 5 ). In response, the one or more server computing devices  1120  may determine the corresponding view port information for the second panoramic image that will be displayed in the time window  602  as described above and send this information to the client computing device  120 . 
         [0069]    The corresponding orientation and zoom level, or corresponding view port information, may be used to display the second panoramic images. For example, referring back to  FIG. 6 , the displayed portion of panoramic image  502  corresponds to the displayed portion of panoramic image  604  even though they may not necessarily have (or been captured at) the same exact 2D or 3D location. In this regard, if the user changes the orientation of panoramic image  502 , a corresponding change to the orientation of panoramic image  604  may be made in the time window  602 . Thus, when the user selects to transition between the panoramic image  502  and  604  (as shown between  FIGS. 6 and 7 ), the user experiences a smooth transition from one panoramic image to another captured at a different point in time which feels like to the user was taken from the same position as the view port of the original panoramic image. 
         [0070]    Flow diagram  900  of  FIG. 9  is an example of some of the features described above that may be performed by one or more computing devices, such as computing devices  110 , described above. As shown in block  902  of this example, the one or more computing devices access a plurality of panoramic images. Each given panoramic image of the plurality of panoramic images is associated with multi-dimensional location information defined in at least two dimensions, uni-dimensional (1D) location information defined in only one dimension, three dimensional (3D) geometry data corresponding to a surface of an object depicted in the given panoramic image, and time information identifying when the given panoramic image was captured. At block  904 , for a first panoramic image of the plurality of images, the first panoramic image being associated with first multi-dimensional location information, first 1D location information, and first time information, a second panoramic image of the plurality of panoramic images is selected. The second panoramic image panoramic image being associated with second multi-dimensional location information, second 1D location information, and second time information. The second panoramic image is selected such that the second 1D location information is closest to the first 1D location information and the first time information and second time information indicate that the first panoramic image and the second panoramic image were captured on different days. At block  906 , first panoramic image is provided for display with an indication that the second panoramic image is available. At block  908 , a zoom level for the second panoramic image is determined based on the first 3D geometry data, the first multi-dimensional location information, the second 3D geometry data, and the second multi-dimensional location information. The second panoramic image is provided for display with the zoom level for the second panoramic image at block  910 . 
         [0071]    Unless otherwise stated, the foregoing alternative examples are not mutually exclusive, but may be implemented in various combinations to achieve unique advantages. As these and other variations and combinations of the features discussed above can be utilized without departing from the subject matter defined by the claims, the foregoing description of the embodiments should be taken by way of illustration rather than by way of limitation of the subject matter defined by the claims. In addition, the provision of the examples described herein, as well as clauses phrased as “such as,” “including” and the like, should not be interpreted as limiting the subject matter of the claims to the specific examples; rather, the examples are intended to illustrate only one of many possible embodiments. Further, the same reference numbers in different drawings can identify the same or similar elements.