T-sheet Error Assessment Using Benchmarks

Benchmark location on georeferenced map, and benchmark location from NGS datasheet.
Point Brown benchmark error assessment on T1435. Upper right: Benchmark as located on georeferenced T-sheet, represented by blue dot inside red circle. Above Middle: Benchmark as located by coordinates from NGS datasheet, shown on DRG, represented by pink dot inside red triangle. Lower Right: Close-up of Point Brown on T1453. Benchmark location from T1453 represented by blue dot, benchmark location location from NGS datasheet represented by pink dot. Distance between these two points represents the offset of georeferenced map. Average offset of all benchmarks on the T-sheet is the amount of averaged error for the georeferenced map. Error is the distance between these two locations.