Reclamation Information Sharing Environment (RISE)

This dataset is a mosaic of scanned analog historical single frame photos collected August 7 1959 These individual aerial photographs have been processed into a mosaic using Agisoft's Metashape photogrammetry software. The processing included fiducial mark placement, alignment, bundle adjustment, and error reduction. The mosaic was then geo-referenced in ArcPro using a spline transformation to ensure the finest referencing. The purpose/scope of the imagery data is to determine, by visual interpretation; large-scale vegetation patterns and physical formation of delta-backwater landforms. QAQC of this dataset included an internal visual inspection of the imagery for geometric anomalies during the alignment and spot checks of georeferencing by comparing landmarks and other features to imagery datasets in the area. The quality of the georeferencing is considered a use limitation due to the natural relief in the study area and changes to the landscape since 1959. The accuracy of feature locations will begin to decline in locations away from the river channel. The margin of error in geo-referencing is +/- 40 feet.