Patent Publication Number: US-2023160695-A1

Title: Surveying assistance device, surveying assistance system, surveying assistance method, and storage medium

Description:
CROSS-REFERENCE TO RELATED APPLICATION, BENEFIT CLAIM, AND INCORPORATION BY REFERENCE 
     This application is a continuation of and claims benefit under 35 USC 120 and 365(c) to copending International Application No. PCT/JP2021/028133, entitled“SURVEYING ASSISTANCE PROGRAM, SURVEYING ASSISTANCE DEVICE, SURVEYING ASSISTANCE METHOD, AND SURVEYING ASSISTANCE SYSTEM”, filed 29 Jul. 2021, the content of which is incorporated herein in its entirety by reference. 
    
    
     TECHNICAL FIELD 
     The present invention relates to a surveying assistance program, a surveying assistance device, a surveying assistance method, and a surveying assistance system. 
     BACKGROUND ART 
     In construction of a linear structure such as a route, a construction plan drawing is prepared, and a construction plan is drawn up while considering a volume of soil of cutting and banking. Route survey means surveying used for examination, planning, design development, etc. for construction of a linear structure. Route survey includes cross-sectional observation in which a height difference (vertical distance) between a constituent point on a cross-section orthogonal to a route and a center point on the cross-section and a center point distance (horizontal distance) are surveyed and a shape of the cross-section is observed. In cross-sectional observation, as a deliverable, a cross-sectional view is prepared for which observation points are connected traversably from the left to the right in a direction in which a section continues. 
     In route survey, in recent years, a method using an electro-optical device such as a total station or a GNSS survey device, with a target or a GNSS receiver used as a surveyed device respectively, a worker holding the surveyed device moves between observation points to acquires necessary observation point data is used. 
     Further, in the method described above, a surveying assistance system let a mobile information processing device read design information including constituent point data to display a plan view, a cross-sectional view, and numerical information on a display unit is proposed. (See, for example, Patent Literature 1, Non-Patent Literature 1, etc.) 
     CITATION LIST 
     Patent Literature 
     
         
         Patent Literature 1: Specification of Japanese Patent No. 6224659 
       
    
     Non-Patent Literature 
     
         
         Non-Patent Literature 1: Operation Manual for Data Collector FC-500 Kantoku-san. V, TOPKON CORPORATION, 2. Observation, p. 42-51 
       
    
     SUMMARY OF INVENTION 
     Technical Problem 
     However, in a surveying assistance system described in Non-Patent Literature 1, a cross-sectional view is created by drawing a straight line connecting observation point data in order of observation. 
     Therefore, a worker is required to observe in order from the left so that an assumed cross-sectional view is created. However, practically, it is not always possible to observe in order from the left. For example, in observation on a section as illustrated in  FIG.  1 A , in a case where there is a hollowed cliff or an obstacle between points P 2  and P 3  and it is difficult to observe the point P 2  and then the point P 3 , the order of measurement is sometimes unavoidable such as from P 1  to P 5 , P 4 , P 3 , P 2 , as in  FIG.  1 B . Alternatively, there is sometimes a case where measurement in order from the left to the right is remarkably inefficient. 
     In such a case, in a conventional surveying assistance system, a cross-sectional view as illustrated in  FIG.  10    is unavoidably created. In a case where an assumed cross-sectional view is not obtained by one-time observation, an observation work has to be performed once again (do-over) to perform measurement from the left and the right again, or very complicated processing has to be performed on a surveying assistance device to prepare a cross-sectional view again. 
     The present invention was made in view of the above circumstances, and an object thereof is to provide a technique with which a cross-sectional view assumed by a worker can be easily prepared in cross-sectional observation. 
     Solution to Problem 
     In order to achieve the object described above, an aspect of the present invention is a surveying assistance device including a screen, a terminal operation unit, a terminal control unit including at least a processor and a memory, and a storage. The processor is configured to, read design information including center point data and constituent point data of a route, in which a cross-section including a center point, the cross-section being orthogonal to the route is set, acquire position information indicating a current position of a surveyed device with a predetermined period, create a plan view and a cross-sectional view from the design information, and display the plan view and the cross-sectional view on the screen, record the acquired position information and survey information calculated from the position information in the storage as observation point data on the cross-section, display an observation point data list in which the observation point data is arranged as data placed in order and an observational cross-sectional view displaying positions of observation points on the cross-sectional view on the screen, make a display order of the observation point data in the observation point data list rearrangeable following a command from the terminal operation unit, and display the observation points on the observational cross-sectional view to be connected by a line following a rearranged display order. 
     Further, in the aspect described above, it is also preferable that the screen and the terminal operation unit are configured as a touch panel display, and the processor is configured to, make the display order of the observation point data rearrangeable by a worker touching a screen to move the displayed observation point data, and in conjunction with rearrangement of the display order, update a display of the connection line so as to connect the observation points in a rearranged display order on the observational cross-sectional view. 
     Further, in the aspect described above, it is also preferable that the processor is configured to, when the observation point data is selected for rearrangement of the display order, display an observation point corresponding to the selected observation point data on the observational cross-sectional view so that the observation point is identifiable. 
     Further, a surveying assistance system according to another aspect of the present invention includes a position acquiring device that acquires the current position of the surveyed device; and the surveying assistance device according to the aspects above. The surveying assistance device is capable of communicating with the position acquiring device, so as to acquire the position information of the surveyed device. 
     Further, a survey assistance method according to still another aspect of the present invention includes, by a computer including a processor, a memory, a screen, an operation unit, and a storage unit, reading design information including center point data and constituent point data of a route, in which a cross-section including a center point, the cross-section being orthogonal to the route is set, acquiring position information indicating a current position of a surveyed device with a predetermined period, creating a plan view and a cross-sectional view of the route from the design information, and displays the plan view and the cross-sectional view on a screen of the computer, recording the acquired position information and survey information calculated from the position information in a storage unit of the computer as observation point data on the cross-section, displaying an observation point data list in which the observation point data is arranged as data placed in order and an observational cross-section displaying positions of observation points on the cross-sectional view on the screen of the computer, making a display order of the observation point data in the observation point data list rearrangeable following a command from an operation unit of the computer, and displaying a connection line connecting the observation points on the observational cross-sectional view following the display order. 
     Further, a computer-readable storage medium according to still another aspect of the present invention includes a surveying assistance program to make a computer read design information including center point data and constituent point data of a route, the design information in which a cross-section including a center point, the cross-section being orthogonal to the route is set, acquire position information indicating a current position of a surveyed device with a predetermined period, create a plan view and a cross-sectional view of the route from the design information, and display the plan view and the cross-sectional view on a screen of the computer, record the acquired position information and survey information calculated from the position information in a storage unit of the computer as observation point data on the cross-section, display an observation point data list in which the observation point data is arranged as data placed in order and an observational cross-sectional view displaying positions of observation points on the cross-sectional view on the screen of the computer, make a display order of the observation point data in the observation point data list rearrangeable following a command from an operation unit of the computer, and display a connection line connecting the observation points on the observational cross-sectional view following the rearranged display order. 
     Benefits of Invention 
     With the surveying assistance program, the surveying assistance device, the surveying assistance method, and the surveying assistance system according to the aspects described above, it is possible to easily prepare a cross-sectional view assumed by a worker. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIGS.  1 A to  10    are views illustrating problems of a cross-sectional view created in a conventional surveying assistance system. 
         FIG.  2    is a view illustrating design information used in a surveying assistance system according to an embodiment. 
         FIG.  3    is a schematic external appearance view of the same surveying assistance system. 
         FIG.  4    is a configuration block diagram of the same surveying assistance system. 
         FIGS.  5 A and  5 B  are views each illustrating an example of an observation screen and a cross-sectional result screen displayed on a terminal screen unit of a surveying assistance device of the same embodiment. 
         FIG.  6    is a flowchart illustrating an example of a surveying assistance method using the same surveying assistance system. 
         FIG.  7    is a flowchart illustrating an example of processing of cross-sectional result display in the same surveying assistance method. 
         FIGS.  8 A to  8 C  are views each illustrating an example of a sorting method of observation point data in the surveying assistance system of the same embodiment. 
         FIG.  9    is a view illustrating an example of the cross-sectional result display displayed on the terminal screen unit of the surveying assistance device of the same embodiment. 
         FIG.  10    is a view illustrating an example of a cross-section of a surveying site to which the surveying assistance system of the same embodiment is preferably applicable. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings, however, the present invention is not limited to these. In the embodiments, members having the same functions and configurations will be provided with the same reference signs, and overlapping description will be omitted as appropriate. 
     EMBODIMENT 
     (Design Information) 
     Prior to description of a configuration of a surveying assistance system (hereinafter, simply referred to as the “system”)  100  according to the embodiment of the present invention, design information used in the present system will be described with reference to  FIG.  2   . Note that the example of  FIG.  2    is a view for the convenience of description and is not limited to a particular shape. 
     The design information is, for example, information prepared with absolute coordinates, the information including a route blueprint required in work of a route, etc. The design information includes centerline data indicating a centerline CL of the route. The design information also includes center point data indicating center points CP 0 , CP 1 , CP 2 , . . . set at predetermined intervals (for example, intervals of 20 m) on the centerline CL. The center points are points at which center stakes are installed in a site. 
     In the design information, cross-sections (hereinafter, simply referred to also as the “sections”) No. 0, No. 1, No. 2, . . . respectively including the center points CP 0 , CP 1 , CP 2 , . . . , the cross-sections being orthogonal to the centerline are set. On the sections, constituent points are set, for example, on the section No. 0, constituent points P 0   1  to P 0   4  are set. The constituent points are points at which stakes serving as marks in the site are installed like points that regulate a width of a road. For example, the constituent points P 0   1 , P 1   1 , P 2   1 , . . . are set at positions whose distances from the center points on the sections are equal along a route direction. 
     (Entire Configuration of System) 
     As illustrated in  FIGS.  3  and  4   , the system  100  includes a position acquiring device  30  and a surveying assistance device  50 . 
     (Configuration of Position Acquiring Device  30 ) 
     The position acquiring device  30  includes a survey device  10  and a surveyed device  40 . The survey device  10  is a total station (electronic distance-measuring and angle-measuring instrument) as a working example. The survey device  10  is installed at a known point via a tripod  2 . Alternatively, coordinate of an install point may be made known by, for example, a backward intersection method, or the like after the survey device  10  is installed. The known coordinate data of the survey device  10  is input into the surveying assistance device  50  in advance and stored in a terminal storage unit  53 . 
     The survey device  10  has, in appearance, a base portion  5  provided on a leveling unit  3 , a bracket portion  7  to be rotated horizontally about an axis H-H on the base portion  5 , and a telescope  9  to be rotated vertically about an axis V-V in the bracket portion  7 . A control arithmetic unit  23  to be described later is accommodated in the bracket portion  7 . 
     The survey device  10  includes an automatic collimation function and an automatic tracking function, and an optical distance-measuring system and an optical tracking system (not illustrated) are accommodated in the telescope  9 . Configurations of the optical distance-measuring system and the optical tracking system are conventionally publicly known. In the survey device  10 , by cooperation of horizontal rotation of the bracket portion  7  and vertical rotation of the telescope  9 , a distance-measuring light and a tracking light are irradiated over the entire circumference. 
     As illustrated in  FIG.  4   , the survey device  10  includes a distance-measuring unit  11 , a tracking unit  12 , a horizontal rotation driving unit  13 , a vertical rotation driving unit  14 , a horizontal angle detector  15 , a vertical angle detector  16 , a communication unit  17 , a tilt sensor  18 , a storage unit  19 , an operation unit  21 , a display unit  22 , and the control arithmetic unit  23 . 
     The distance-measuring unit  11  emits a distance-measuring light by using the optical distance-measuring system, receives a reflected light from a target  41  provided in the surveyed device  40 , and automatically collimates and measures a distance to the target  41 . 
     The tracking unit  12  emits a tracking light by using the optical tracking system, captures a position of the target  41  from a reflected light from the target  41 , and in a case where the target  41  is moved, automatically tracks the target  41 . 
     The horizontal rotation driving unit  13  is a motor provided in the base portion  5 . The horizontal rotation driving unit  13  rotates the bracket portion  7  about the axis H-H with respect to the base portion  5 . The vertical rotation driving unit  14  is a motor provided in the bracket portion  7 . The vertical rotation driving unit  14  rotates the telescope  9  about the axis V-V. 
     The horizontal angle detector  15  and the vertical angle detector  16  are rotary encoders. The horizontal angle detector  15  detects an angle of the bracket portion  7  about the axis H-H, and the vertical angle detector  16  detects an angle of the telescope  9  about the axis V-V. As a result, the horizontal angle detector  15  and the vertical angle detector  16  constitute an angle-measuring unit that measures an angle to the target  41 . 
     The communication unit  17  is a communication control device that connects the survey device  10  and the surveying assistance device  50  by wire or wirelessly. As a communications standard to realize the communication unit  17 , Wi-Fi (registered trademark) as one of wireless LAN standards or 4G (fourth-generation mobile communications system) may be adopted. Alternatively, a short-range wireless communications standard such as Bluetooth (registered trademark) and infrared communication may be adopted. 
     The tilt sensor  18  is atilt sensor of a bubble tube type, a capacitance type, etc., and is fixed on an upper surface of a rotation shaft (not illustrated) of the base portion  5 . A value of the tilt sensor  18  when a rotation shaft of the horizontal rotation driving unit  13  is once rotated forward and backward is read, and based on a gap amount of forward and backward rotations, horizontalness of the leveling unit  3  is adjusted. 
     The storage unit  19  is a storage medium that memorizes, stores, and transmits information in a form with which the control arithmetic unit  23  is capable of processing, and for example, an HDD (Hard Disc Drive), a flash memory, etc. is adopted. In the storage unit  19 , the measured survey data and a program for various processing in the control arithmetic unit are stored. 
     The operation unit  21  is a plurality of buttons provided on an outer surface of the bracket portion  7 . Various information relating to actions of the survey device  10  can be input via the operation unit  21 . 
     The display unit  22  is a liquid crystal display provided on the outer surface of the bracket portion  7 , and displays various information relating to surveying. 
     The control arithmetic unit  23  is a microcomputer for which a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), etc. are mounted on an integrated circuit. The control arithmetic unit  23  is connected to the units of the survey device  10 . 
     The control arithmetic unit  23  reads the program for executing various functions of the survey device  10  from the storage unit  19  or the RAM and controls the units of the survey device  10  to execute various functions such as automatic tracking, distance measurement, and angle measurement. The control arithmetic unit  23  also performs arithmetic processing on data obtained by distance measurement and angle measurement, and acquires position information (position coordinates) of the target  41 . 
     Further, the control arithmetic unit  23  communicates with the surveying assistance device  50  via the communication unit  17 , executes measurement following an order of the surveying assistance device  50 , and sends survey data of the surveyed device  40  to the surveying assistance device  50 . 
     The surveyed device  40  includes the target  41  and a pole-shaped support member  42  that supports the target  41 . 
     The target  41  is a so-called 360-degree prism configured by radially combining a plurality of triangular-pyramid-shaped prisms, however, the present invention is not limited to this. The target  41  retro-reflects incident light in a direction opposite to an incident direction. 
     In the support member  42 , a length H 1  from a leading end to center O of the target  41  is known. The support member  42  includes a level (not illustrated), and can be installed vertically. By subtracting the length H of the support member  42  from three-dimensional coordinates of the center O determined from distance measurement and angle measurement data which is obtained by measuring the distance and the angle to the target  41  installed vertically at an observation point P via the support member  42  by the survey device  10  installed at the known point, it is possible to determine three-dimensional coordinates of the observation point P as the position information of the surveyed device  40 . 
     As another working example of the position acquiring device  30 , it is possible to use a GNSS survey device. In this case, by using a GNSS receiving device capable of communicating with the surveying assistance device  50  as the surveyed device  40 , a current position of the surveyed device  40  is surveyed. 
     (Configuration of Surveying Assistance Device) 
     The surveying assistance device  50  is a portable information processing device capable of communicating with the position acquiring device  30 . The surveying assistance device  50  is realized by, for example, a mobile computer terminal such as a mobile phone, a smartphone, a tablet computer, a PDA, or a data collector. 
     The surveying assistance device  50  includes a terminal screen unit  51 , a terminal operation unit  52 , the terminal storage unit  53 , a terminal communication unit  54 , and a terminal control unit  55 . 
     The terminal screen unit  51  is configured by, for example, a touch-panel type liquid crystal display integrated with the terminal operation unit  52 . The terminal screen unit  51  displays images according to a processing content such as an observation screen  60 , a section designation screen (not illustrated), or a cross-sectional result display screen (hereinafter, referred to as the “cross-sectional result screen”)  80 . 
     For the terminal storage unit  53 , various programs and various data are stored in a storage medium in a readable and writable manner. The terminal storage unit  53  is, for example, an HDD. The terminal storage unit  53  may be, for example, an optical disc drive such as a CD (Compact Disc) drive. In the terminal storage unit  53 , a communication program, an image display program for displaying a work content, etc. and a communication content, etc. on the terminal screen unit  51 , various programs for executing cross-sectional observation, etc. are stored. 
     Further, in the terminal storage unit  53 , initial setting information such as coordinates of the survey device  10  and a height H of the target  41 , and the design information are also stored. The terminal storage unit  53  also stores measurement data of the target received from the survey device  10  and survey information calculated in a survey information display unit  555  in a form of a list in order of measurement in association with designated sections and names of the observation points indicating the constituent points. 
     The terminal communication unit  54  is a communication control device capable of communicating with the survey device  10  via the communication unit  17  of the survey device  10 , and has the same communications standard as the communication unit  17 . 
     The terminal control unit  55  is a control unit including at least a CPU and memories (ROM, RAM), etc. The terminal control unit  55  controls the surveying assistance device  50  and the survey device  10  based on an input signal from the terminal communication unit  54 , the terminal operation unit  52 , etc. The terminal control unit  55  calls and executes a program stored in the RAM or the terminal storage unit  53 . 
     The terminal control unit  55  includes a design information reading unit  551 , a section designating unit  552 , a view display unit  553 , a position information acquiring unit  554 , the survey information display unit  555 , a recording executing unit  556 , a cross-sectional observation result display unit (hereinafter, referred to as the “cross-sectional result display unit”)  557 , a display order changing unit  558 , and a connection line display unit  559  as functional units. 
     The design information reading unit  551  reads the design information stored in the terminal storage unit  53 . Alternatively, the design information reading unit  551  may receive and read design information stored in an external storage device via the terminal communication unit  54 . 
     The section designating unit  552  designates a section of an observation object from the sections set in the design information following an input of a worker. The section of the observation object is a section including a center point which serves as a reference in the calculation of vertical and horizontal distances and will be hereinafter referred to as the “designated section”. 
     The view display unit  553  creates a plan view  61  in which the centerline CL of the route is projected on a horizontal plane from the design information, and displays it on the observation screen  60  ( FIGS.  5 A and  5 B ). The view display unit  553  also creates a cross-sectional view  62  indicating the centerline CL in the designated section from the sections set in the design information, and displays it on the observation screen  60  of the terminal screen unit  51  ( FIGS.  5 A and  5 B ). The observation screen  60  will be described later. 
     The position information acquiring unit  554  receives the measurement data of the target  41  measured by the survey device  10  with a predetermined period via the terminal communication unit  54  upon each measurement. The position information acquiring unit  554  acquires position coordinates of the surveyed device  40  in an absolute coordinate system as the position information of the surveyed device  40  from coordinates of the survey device  10  and the height H 1  of the target stored in the terminal storage unit  53 . 
     The survey information display unit  555  makes display on the terminal screen unit  51  as the survey information based on the position information of the surveyed device  40  acquired by the position information acquiring unit  554  and updates the display every time the position information is acquired. The survey information includes the current position of the surveyed device  40 . The current position of the surveyed device  40  is displayed on the plan view  61  as a marking M 1  ( FIGS.  5 A and  5 B ), and also displayed on the cross-sectional view  62  as a marking M 2  ( FIGS.  5 A and  5 B ). 
     Further, the survey information includes various information calculated based on the position information. For example, the survey information is a distance of the surveyed device  40  from the designated section, the horizontal distance and the vertical distance from the center point on the designated section to the current position of the surveyed device  40 , etc. The survey information may also include various information relating to cross-sectional observation such as the number of a designated section (center point) and information of the constituent points in the design information. 
     When the worker thinks that he/she has reached the observation point, installs the surveyed device  40  at the observation point, and taps a confirmation button  69 , the recording executing unit  556  stores the survey information at the current position of the surveyed device  40  in the terminal storage unit  53  as observation point data of the observation point. The observation point data is stored in association with the designated section and the constituent point in the design information corresponding to the observation point. 
     The cross-sectional result display unit  557  displays the cross-sectional result screen  80 . The cross-sectional result screen  80  will be described later. 
     The display order changing unit  558  changes the display order of the observation points in an observation point data list displayed on the cross-sectional result screen  80  following an input of the worker. As an input method, the worker may move part of the displayed observation point data whose display order is to be changed by touching with a finger, etc. on the screen and moving it to a position of the aimed order. Specifically, for example, it is possible to perform the input by a method of re-arrangement by flicking on a display unit of the observation point data displayed as a list, etc. Alternatively, the displayed observation point data list may be configured such that an order change can be input and the order is changed following the input. 
     The connection line display unit  559  draws a line connecting the observation points in the display order changed by the display order changing unit  558 , and prepares an observational cross-sectional view. 
     Functions of the functional units may be realized by a circuit, or may be realized by executing a program. In a case where the functions are realized by a program, the program can be stored in a computer-readable storage medium such as a magnetic disk, a flexible disc, an optical disc, a compact disc, a Blu-ray (registered trademark) disc, and a DVD. 
     (Observation Screen and Cross-Sectional Result Screen) 
     Next, with reference to  FIGS.  5 A and  5 B , the observation screen  60  and the cross-sectional result screen  80  will be described. Note that the numbers themselves displayed on the screens of  FIGS.  5 A and  5 B  do not indicate numerical data corresponding to the cross-sectional view but are mere examples of display. The same applies to  FIGS.  8 A to  8 C . 
     (Observation Screen) 
     On the observation screen  60 , the plan view  61  and the cross-sectional view  62  created by the view display unit  553  are displayed side by side. 
     Further, in the plan view  61 , the marking M 1  indicating the current position of the surveyed device  40  is displayed. In the cross-sectional view  62 , the marking M 2  indicating the current position of the surveyed device  40  is displayed. 
     Further, on the observation screen  60 , an orientation mark  63  indicating north, south, east, and west of the plan view  61 , and a map scale  64  indicating scale are displayed. Further, on the observation screen  60 , functional icons  65   a ,  65   b ,  65   c , . . . for aiding a surveying work, including a functional icon (cross-sectional result display button)  65   d  for calling the cross-sectional result screen  80  are displayed. A screen shift button  66  for shifting to the section designating screen (not illustrated) for selecting the designated section as initial setting is also displayed. 
     Further, on the observation screen  60 , an observation start/stop button  67  for ordering the survey device  10  to start and stop tracking and observation of the surveyed device  40 , and a recording button  68  for recording the observation point data is displayed. 
     Further, on the observation screen  60 , survey information marks  64   a  to  64   f  are displayed by the survey information display unit  555 . The survey information marks  64   a  to  64   f  respectively indicate, for example, the section number, a designated reference point, a horizontal distance of the surveyed device  40  from the designated section in a front and rear direction of the route, a horizontal distance of the surveyed device  40  from the selected reference point in a left and right direction orthogonal to the front and rear direction of the route, a vertical distance of the surveyed device  40  from the designated reference point, and an objective height, that is, the length H 1  from the leading end of the support member  42  to the center O of the target  41 . 
     In addition, the plan view  61  and the cross-sectional view  62  can accept arbitrarily zooming. It is possible to change a position of the cross-sectional view  62  relative to the plan view  61  which is displayed on the terminal screen unit  51  at the same time in response to a command from the terminal operation unit  52 , and specifically to change the position freely in a frame by a touch panel operation. It is also possible to switch display/non-display of the cross-sectional view  62 . 
     (Cross-Sectional Result Screen) 
     On the cross-sectional result screen  80 , an observation point data list  81  in which observation point data  81   a  to  81   e  recorded at the observation points are arranged as data placed in order and an observational cross-sectional view  83  displaying observation point markings  82   a  to  82   e  which indicate positions of the observation points on the basis of the observation point data  81   a  to  81   e  on the cross-sectional view  62  created by view display unit  553  are displayed. 
     The observation point data include, for example, the names of the observation points (e.g. RO.000_No. 1+01000 L0.000), an elevation (e.g. Elev: 5.300), and a distance from the center point (horizontal distance) (e.g. CL Offset: L7.200). 
     Further, in the observational cross-sectional view  83 , a connection line  84  connecting the observation point markings  82   a  to  82   e  is displayed. 
     (Surveying Assistance Method) 
       FIG.  6    is a flowchart illustrating an example of a surveying assistance method using the surveying assistance device  50  of the present embodiment. 
     In cross-sectional observation, the survey device  10  is installed at the known point and in a state of being capable of automatically tracking the target  41 . The worker holds the surveying assistance device  50  while vertically holding the surveyed device  40 , walks on the designated section of a surveying site, and when coming to a point corresponding to the constituent point (observation point), records the observation point data. This is repeated at the constituent points on the designated section. 
     When the surveying assistance device starts processing for cross-sectional observation, in Step S 01 , the design information reading unit  551  reads the design information. 
     Next, in Step S 02 , the section designating unit  552  selects a section of the observation object (designated section) following an input of the worker as initial setting. 
     Next, in Step S 03 , the view display unit  553  displays the created plan view  61  and the created cross-sectional view  62  on the observation screen  60  of the terminal screen unit  51 . 
     Next, in Step S 04 , when the worker taps the observation start/stop button  67  and thereby observation is started, the survey device  10  measures the surveyed device  40  at predetermined intervals, and sends measurement data to the surveying assistance device  50  upon each measurement. 
     Then, in Step S 05 , the position information acquiring unit  554  receives the measurement data and acquires the position information of the current position of the surveyed device  40 . 
     Next, in Step S 06 , the survey information display unit  555  calculates the survey information based on the position information of the current position of the surveyed device  40 . 
     Next, in Step S 07 , the survey information display unit  555  displays the markings M 1  and M 2  indicating the current position of the surveyed device  40  on the observation screen  60  of the terminal screen unit  51 , and also displays the survey information marks  64   a  to  64   f  on the observation screen  60 . The survey information display unit  555  updates the displays from the second time. 
     Next, in a case where there is no command to execute recording (No) in Step S 08 , the terminal control unit  55  repeats Steps S 05  to S 08 , calculates the survey information every time the position information is acquired, and updates the displays of the markings M 1  and M 2  and the survey information. 
     Then, when the worker taps the recording button  68  and thereby execution of recording is commanded (Yes) in Step S 08 , in Step S 09 , the recording executing unit  556  records the position information and the survey information at that time point in the terminal storage unit  53  as the observation point data. The worker walks toward a constituent point while confirming the terminal screen unit  51 . When judging that he/she has reached the constituent point to be observed, the worker vertically holds the surveyed device  40 , taps the recording button  68 , and makes the surveying assistance device  50  record the survey information at that position as the survey information of the observation point. 
     Next, in Step S 10 , the worker judges whether or not a next observation point is to be observed, and in a case where the next observation point is to be observed (Yes), in Step S 11 , the worker moves to the next observation point. In the meantime, the surveying assistance device  50  repeats the processing of Steps S 05  to S 08 . Then, when reaching the next observation point, the worker taps the recording button  68 . Thereby, the processing shifts to Step S 09  and recording is executed. 
     In a case where the next observation point is not to be observed, including for the reason, for example, “an interim result is wished to be confirmed”, etc. in Step S 10 , when the worker taps the cross-sectional result display button  65   d  and thereby inputs a command to display a cross-sectional result (Yes) in Step S 12 , in Step S 13 , the cross-sectional result display unit  557  displays the cross-sectional result screen  80  on the terminal screen unit  51 . When display of the cross-sectional result is completed, the processing shifts to Step S 14 . Details of the cross-sectional result display will be described later. 
     On the other hand, in a case where there is no input of the command to display the cross-sectional result (No) in Step S 12 , the processing shifts to Step S 14 . Then, the terminal control unit  55  repeats Steps S 05  to S 14  until an operation to end observation of tapping the observation start/stop button  67  again is performed by the worker in Step S 14 , and in a case where a command to end observation is issued by the worker (Yes in Step S 14 ), ends observation. 
     Next, the details of the cross-sectional result display will be described. For convenience of description, it is assumed that in the section of the shape illustrated in  FIGS.  1 A to  10   , observation is performed in the order of P 1 , P 5 , P 4 , P 3 , P 2 . Data of the points P 1  to P 5  are stored in a terminal storage unit  85  as the observation point data  81   a  to  81   e.    
     As illustrated in  FIG.  7   , when the cross-sectional result display is started, in Step S 21 , the cross-sectional result display unit  557  displays the observation point data list  81  on the terminal screen unit  51  as illustrated in FIGS.  8 A to  8 C. 
     At the same time, in Step S 22 , the cross-sectional result display unit  557  displays the observational cross-sectional view  83  on the terminal screen unit  51 . 
     Next, in Step S 23 , the connection line display unit  559  displays the connection line  84  so that the observation point markings  82   a  are connected in the display order of the observation point data list  81  ( FIGS.  8 A to  8 C ). 
     Next, when a command to sort data by the worker is detected (Yes) in Step S 24 , in Step S 25 , the observation point data list  81  is sorted following the command. Then, in Step S 26 , the connection line display unit  559  updates the display of the connection line  84  so that the observation point markings  82   a  to  82   e  are connected in an order of arrangement in the observation point data list  81  and the processing shifts to Step S 27 . 
     In the present example, specifically, by flicking the observation point data  81   b  as illustrated by the arrow  91  in the state of  FIG.  8 A , a position of the observation point data  81   b  is moved to the next to the observation point data  81   a  as illustrated in  FIG.  8 B . Corresponding to this, the display of the connection line  84  is updated. By flicking as in the arrow  92  from the state of  FIG.  8 B  and further continuing similarly, it is possible to create a correct observational cross-sectional view. In this way, in the present example, Steps S 24  to S 26  are executed substantially in conjunction at the same time. 
     Regarding which observation point data is to be flicked by the worker at the time of flicking, it is possible to perform while confirming the name of the observation point included in the observation point data. To which observation point marking displayed on the observational cross-sectional view  83  the selected observation point data corresponds may be displayed to be visually identifiable. Specifically, as illustrated in  FIG.  9   , when the observation point data is tapped, the corresponding observation point marking  82   b  may be deformed, or the like. Alternatively, colors may be respectively different between the observation point markings  82 , and the markings of the same color may be displayed for the corresponding observation point data. 
     On the other hand, in a case where there is no need for sorting the data and no command to sort the observation point data is detected (No) in Step S 24 , the processing shifts to Step S 27  straightaway. 
     Next, detection of a command to store the observational cross-sectional view data is determined and the command is detected (Yes) in Step S 27 , in Step S 28 , the observational cross-sectional view data is stored in the terminal storage unit  53  and the processing is ended. On the other hand, in a case where there is no command (No), the processing of the cross-sectional result display is ended straightaway. 
     Note that the cross-sectional result display may not only be executed as a series of actions with observation but only the processing of the cross-sectional result display may be executable for confirmation at the end of observation. 
     Further, in a case where observation of all the observation points is not completed, the stored observational cross-sectional view data may be read and additional observation may be performed. 
     In the present embodiment, at the time of creating the observational cross-sectional view  83  which is a deliverable from the result of cross-sectional observation, by re-arranging the order of the observation point data  81   a , . . . displayed on the terminal screen unit  51 , it is possible to arbitrarily re-arrange the connection order of the connection line  84 . With the configuration described above, it is possible to easily prepare the cross-section assumed by the worker. Thereby, the worker can execute cross-sectional observation in an efficient order without being aware of the order of measurement. 
     In particular, in the present embodiment, the terminal screen unit  51  and the terminal operation unit  52  are configured as a touch panel display, the observational cross-sectional view  83  and the observation point data list  81  are displayed on the cross-sectional result screen  80 , and the connection line  84  whose connection is changed is displayed in conjunction with re-arrangement of the order of the observation point data  81   a , . . . of the observation point data list  81  by flicking of the worker. With the configuration described above, the worker can sort the observation point data  81   a , . . . while confirming a connection state of the connection line  84  upon each flicking. Therefore, the worker can intuitively perform the observational cross-sectional view  83  while comparing with the observational cross-sectional view assumed by himself/herself, and the burden on the worker is reduced. 
     At a site having a cross-section of a complicated shape as in  FIG.  10   , it is difficult to observe in order from the left to the right. Furthermore, with a simple algorithm of connecting a connection line in order of observation or connecting a connection line from the left to the right, it is difficult to correctly connect the connection line of the observational cross-sectional view of such a complicated shape. 
     The present embodiment is advantageous since the connection line can be easily connected while the worker assumes an observational cross-sectional view even with an observational cross-section of a complicated shape. 
     Another Modified Example 
     As another modified example, in initial setting, the worker does not set a designated section by an input but among the sections set in the design information, a section whose distance to the current position of the surveyed device  40  is the shortest may be automatically designated. 
     REFERENCE SIGNS LIST 
     
         
           10 : Survey device 
           30 : Position acquiring device 
           40 : Surveyed device 
           50 : Surveying assistance device (computer) 
           51 : Terminal screen unit (screen) 
           53 : Terminal storage unit (storage) 
           55 : Terminal control unit 
           551 : Design information reading unit 
           553 : View display unit 
           554 : Position information acquiring unit 
           556 : Recording executing unit 
           557 : Cross-sectional result display unit 
           558 : Display order changing unit 
           559 : Connection line display unit 
           61 : Plan view 
           62 : Cross-sectional view 
           81 : Observation point data list 
           81   a : Observation point data 
           81   b : Observation point data 
           81   c : Observation point data 
           81   d : Observation point data 
           81   e : Observation point data 
           83 : Observational cross-sectional view 
           84 : Connection line 
           85 : Terminal storage unit 
           100 : Surveying assistance system