ground-truthing
 n.— «They use the photos to plot GPS coordinates of questionable places and then hit the water for a closer look. The process is called “ground-truthing.” “The more groundtruthing we do, the better the map’s going to be,” Kolasa said. “A small patch like this could easily be missed by photo interpretations.”» —“Searching for seagrass” by Tony Marrero Hernando Today (Tampa, Florida) July 15, 2007. (source: Double-Tongued Dictionary)

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