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): <br> <ul> <li><strong>calibration_distance:</strong> The distance between calibration points in meters.</li> <li><strong>calibration_points:</strong> Pixel coordinates of the calibration points. Format (array): [X1,Y1; X2; Y2]</li> <li><strong>calibration_time:</strong> Time increment between image frames in milliseconds.</li> <li><strong>caluv:</strong> Correction factor used to convert pixel/second into meters/second.</li> <li><strong>calxy:</strong> Pixel ground resolution in meters/pixel.</li> <li><strong>directory:</strong> Path to folder containing images used in PIV analysis.</li> <li><strong>filenames:</strong> Cell array of strings containing image frame filenames. Format (cellarray): 1*m (m: number of frames)</li> <li><strong>imagesLocation:</strong> Path to folder containing images used in PIV analysis.</li> <li><strong>i:</strong> Dimensions of PIV results. Format: i*number of rows along y-axis</li> <li><strong>j:</strong> Dimensions of PIV results. Format: j*number of columns along x-axis</li> <li><strong>k:</strong> Dimensions of PIV results. Format: k*number ofimages or frames in time (numbmer of images processed)</li> <li><strong>p:</strong> PIVLab image pre-processing settings. See PIVLab documentation for information.</li> <li><strong>pixel_resolution:</strong> Pixel ground resolution in meters. Assumes square pixels.</li> <li><strong>r:</strong> PIVLab post-processing settings. See PIVLab documentation for information.</li> <li><strong>resultsFileFullPath:</strong> Path to folder containing PIV results in mat-file format.</li> <li><strong>s:</strong> PIVLab standard processing settings. See PIVLab documentation for information.</li> <li><strong>typevector:</strong> 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</li> <li><strong>typevector_filt:</strong> 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</li> <li><strong>u_mean:</strong> 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).</li> <li><strong>u_stack:</strong> Array (m*n*p) containing filtered u component velocities for each vector (m*n) for each frame (p).</li> <li><strong>v_mean:</strong> 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).</li> <li><strong>v_stack:</strong> Array (m*n*p) containing filtered v component velocities for each vector (m*n) for each frame (p).</li> <li><strong>x_ground:</strong> Array (m*n) containing the x (horizontal) ground coordinate in meters for each PIV result vector. Origin of coordinates is the lower left corner.</li> <li><strong>x_pixel:</strong> Array (m*n) containing the x (horizontal) pixel coordinate for each PIV result vector.</li> <li><strong>y_ground:</strong> Array (m*n) containing the y (horizontal) ground coordinate in meters for each PIV result vector. Origin of coordinates is the lower left corner.</li> <li><strong>y_pixel:</strong> Array (m*n) containing the y (horizontal) pixel coordinate for each PIV result vector.</li> <li><strong>zzVariableDescriptions:</strong> A structured array containing elements named after each variable in this dataset.</li> </ul> <br> 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: <ul> <li>ACR: Androscoggin River, Auburn, Maine, USA</li> <li>AFR: Agua Fria River, near Rock Springs, Arizona, USA</li> <li>CCC: Coachella Canal above All-American Canal Diversion, California, USA</li> <li>CMC: Cochiti East Side Main Channel, near Cochiti, New Mexico, USA</li> <li>GLR: Gila River near Dome, Arizona, USA</li> <li>RMC: Reservation Main Canal near Yuma, Arizona, USA</li> <li>SMC: Sile Main Canal (at head) at Cochiti, New Mexico, USA</li> <li>WMD: Wellton-Mohawk Main Outlet Drain near Yuma, Arizona, USA</li> </ul>

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  "010:12"
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[
  "Geospatial"
]