Particle Image Velocimetry Results

This child item contains the Mathworks Matlab mat-file outputs from the scripts described in the Ancillary Scripts child item. Each file contains the results for a particular field site. See the FGDC metadata Process Steps section for more information about opening these files. The mat-files included here have a standard set of output variables and include a variable named "zzVariableDescriptions" in each mat-file which describes the contents of the file. The following variables and descriptions are included in each mat-file (extracted from the "zzVariableDescriptions" variable):
&lt;br&gt;
&lt;ul&gt;
&lt;li&gt;&lt;strong&gt;calibration_distance:&lt;/strong&gt; The distance between calibration points in meters.&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;calibration_points:&lt;/strong&gt; Pixel coordinates of the calibration points. Format (array): [X1,Y1; X2; Y2]&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;calibration_time:&lt;/strong&gt; Time increment between image frames in milliseconds.&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;caluv:&lt;/strong&gt; Correction factor used to convert pixel/second into meters/second.&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;calxy:&lt;/strong&gt; Pixel ground resolution in meters/pixel.&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;directory:&lt;/strong&gt; Path to folder containing images used in PIV analysis.&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;filenames:&lt;/strong&gt; Cell array of strings containing image frame filenames. Format (cellarray): 1*m (m: number of frames)&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;imagesLocation:&lt;/strong&gt; Path to folder containing images used in PIV analysis.&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;i:&lt;/strong&gt; Dimensions of PIV results. Format: i*number of rows along y-axis&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;j:&lt;/strong&gt; Dimensions of PIV results. Format: j*number of columns along x-axis&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;k:&lt;/strong&gt; Dimensions of PIV results. Format: k*number ofimages or frames in time (numbmer of images processed)&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;p:&lt;/strong&gt; PIVLab image pre-processing settings. See PIVLab documentation for information.&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;pixel_resolution:&lt;/strong&gt; Pixel ground resolution in meters. Assumes square pixels.&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;r:&lt;/strong&gt; PIVLab post-processing settings. See PIVLab documentation for information.&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;resultsFileFullPath:&lt;/strong&gt; Path to folder containing PIV results in mat-file format.&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;s:&lt;/strong&gt; PIVLab standard processing settings. See PIVLab documentation for information.&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;typevector:&lt;/strong&gt; Array (m*n*p) containing raw vector result type of frame (m*n) for each frame (p). Format: type 1-valid PIV vector; type 0-masked vector; type 2-invalid PIV vector&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;typevector_filt:&lt;/strong&gt; Array (m*n*p) containing filtered vector result type of frame (m*n) for each frame (p). Format: type 1-valid PIV vector; type 0-masked vector; type 2-invalid PIV vector&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;u_mean:&lt;/strong&gt; Array (m*n) containing the temporal average u component of velocity in meters/second. Values are averaged for every vector for each frame (along p dimension).&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;u_stack:&lt;/strong&gt; Array (m*n*p) containing filtered u component velocities for each vector (m*n) for each frame (p).&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;v_mean:&lt;/strong&gt; Array (m*n) containing the temporal average v component of velocity in meters/second. Values are averaged for every vector for each frame (along p dimension).&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;v_stack:&lt;/strong&gt; Array (m*n*p) containing filtered v component velocities for each vector (m*n) for each frame (p).&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;x_ground:&lt;/strong&gt; Array (m*n) containing the x (horizontal) ground coordinate in meters for each PIV result vector. Origin of coordinates is the lower left corner.&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;x_pixel:&lt;/strong&gt; Array (m*n) containing the x (horizontal) pixel coordinate for each PIV result vector.&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;y_ground:&lt;/strong&gt; Array (m*n) containing the y (horizontal) ground coordinate in meters for each PIV result vector. Origin of coordinates is the lower left corner.&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;y_pixel:&lt;/strong&gt; Array (m*n) containing the y (horizontal) pixel coordinate for each PIV result vector.&lt;/li&gt;
&lt;li&gt;&lt;strong&gt;zzVariableDescriptions:&lt;/strong&gt; A structured array containing elements named after each variable in this dataset.&lt;/li&gt;
&lt;/ul&gt;
&lt;br&gt;
Each Field Site is abbreviated in various files in this data release. File and folder names are used to quickly identify which site a particular file or dataset represents. The following abbreviations are used:
&lt;ul&gt;
&lt;li&gt;ACR: Androscoggin River, Auburn, Maine, USA&lt;/li&gt;
&lt;li&gt;AFR: Agua Fria River, near Rock Springs, Arizona, USA&lt;/li&gt;
&lt;li&gt;CCC: Coachella Canal above All-American Canal Diversion, California, USA&lt;/li&gt;
&lt;li&gt;CMC: Cochiti East Side Main Channel, near Cochiti, New Mexico, USA&lt;/li&gt;
&lt;li&gt;GLR: Gila River near Dome, Arizona, USA&lt;/li&gt;
&lt;li&gt;RMC: Reservation Main Canal near Yuma, Arizona, USA&lt;/li&gt;
&lt;li&gt;SMC: Sile Main Canal (at head) at Cochiti, New Mexico, USA&lt;/li&gt;
&lt;li&gt;WMD: Wellton-Mohawk Main Outlet Drain near Yuma, Arizona, USA&lt;/li&gt;
&lt;/ul&gt;

Tags: acoustic-doppler-current-profiling, aerial-video, agua-fria-river-maricopa-county-arizona-usa, androscoggin-river-androscoggin-county-maine-usa, auburn-androscoggin-county-maine-usa, coachella-canal-imperial-county-california-usa, cochiti-lake-reservoir-sandoval-county-new-mexico-usa, cochiti-main-canal-cochiti-lake-sandoval-county-new-mexico-usa, drone, gila-river-yuma-county-arizona-usa, great-falls-androscoggin-county-maine-usa, hydrographic-datasets, imperial-valley-imperial-county-california-usa, inlandwaters, kinter-yuma-county-arizona-usa, remote-sensing, reservation-main-canal-imperial-county-california-usa, stream-discharge, stream-gage-measurement, streamflow, suas, unmanned-aircraft-system, unoccupied-aircraft-system, usgs-61eb31cfd34e8b818ada914b, usgs-science-data-catalog-sdc, videography, water-resources
Organization: Department of the Interior