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The TIGER/Line data use Global Coordinate System North American Datum of 1983 (GCS NAD83). Based on About the 2015 TIGER/Line Shapefiles, each .prj file contains the following: GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137,298.257222101]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]] Which means ...



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