![]() ![]() ![]() In 2014, improvements to GCP files began – these include removing outdated files, and creating new, time-specific and seasonal GCPs. Image chip acquisition date - string in form mm-dd-yyyy Image chip type - string ABS (Absolute) or REL (relative) Image chip Moravec rank if selection method is MORAVEC, zero otherwise - integer Image chip pixel size y value in meters - double Image chip pixel size x value in meters - double Image chip reference point projection Y in meters - double ![]() Image chip reference point projection X in meters - double Image chip date updated - string in form mm-dd-yyyy GCP elevation of reference point in meters - double GCP longitude of reference point in degrees - double GCP latitude of reference point in degrees - double GCP date updated - string in form mm-dd-yyyy Unique Ground Control Point (GCP) ID - integer The graphic below displays these differences, and the adjustments needed to be made. Ground control 2 software#Some image processing software packages use the Pixel Is Area designation, and users will need to make adjustments to use the data in the selected software.Ĭhanging from either Pixel Is Point to Pixel Is Area or Pixel is Areato Pixel is Point involves adjusting the corner coordinates by one-half a pixel in both the line and sample directions. The metadata file delivered with each Landsat Level-1 product defining the corner coordinates also list the product corners as Pixel is Point. Landsat Level-1 products and Ground Control points are produced using Pixel Is Point, as the map coordinate of the center of the pixel for all 4 corners of the image is divisible by a whole number of the resolution of the band, therefore for each band, the corner coordinates are all divisible by 30, with a remainder of zero.
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