Analysis of historic orthomosaic imagery collected through various agencies for mapping active channel and floodplain changes along a 22.5-km reach of the Green River at Gray Canyon near Green River, Utah from 1938-2021: orthomosaics

The U.S. Geological Survey gathered historic aerial photography and remote sensing imagery from a variety of sources for mapping channel change along a 22.5 kilometer reach of the Green River at Gray Canyon near Green River, Utah. Imagery was downloaded in .TIF format and Structure-from-Motion (SfM) photogrammetry techniques were applied (Over et al. 2021) using Agisoft Metashape Professional (v. 1.7.3 build 12473) on applicable imagery. Orthomosaics were created for each year of imagery from 1938 to 2021. The 2006 NAIP imagery was used to identify a common set of Ground control points that were used in each year's imagery in the georectification process. The rectified orthomosaics were clipped using a single study area of interest polygon so the final clipped orthomosaic rasters represented the same study area extent for analysis.

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  "010:12"
]

[
  "geospatial"
]