Summary

Description

A map service on the www that depicts sixty-seven maps from Royce’s 1897 report that have been scanned, georeferenced in JPEG2000 format, and digitized to create this feature class of cession maps. Each Royce map was georeferenced against one or more of the following USGS 1:2,000,000 National Atlas Feature Classes contained in ..\NatlAtlas_USGS.gdb: cities_2mm, hydro_ln_2mm, hydro_pl_2mm, plss_2mm, states_2mm. Cessions were digitized as a file geodatabase (GDB) polygon feature class, projected as NAD83 USA_Contiguous_Lambert_Conformal_Conic, which is the same projection used to georeference the maps. The feature class was later reprojected to WGS 1984 Web Mercator (auxillary sphere) to optimize it for the Tribal Connections Map Viewer. Polygon boundaries were digitized as to not deviate from the drawn polygon edge to the extent that space could be seen between the digitized polygon and the mapped polygon at a viewable scale. Topology was maintained between coicident edges of adjacent polygons. Each cession was labeled with a unique cession number, which was entered into the feature class as a field attribute. The cession number serves as the link referencing relationship classes, joining additional attribute information from statewide NAGRPA tables, and Cession Dates, (as transcribed from Royce's Schedule of Land Cessions.)