Digital Geologic-GIS Map of Johnstown Flood National Memorial and portions of Allegheny Portage Railroad National Historic Site, Pennsylvania (NPS, GRD, GRI, JOFL, JOFL_ALPO digital map) adapted from a Pennsylvania Geological Survey Water Resource Report map by McElroy (1998)
The Digital Geologic-GIS Map of Johnstown Flood National Memorial and portions of Allegheny Portage Railroad National Historic Site, Pennsylvania is composed of GIS data layers and GIS tables, and is available in the following GRI-supported GIS data formats: 1.) a 10.1 file geodatabase (jofl_alpo_geology.gdb), a 2.) …