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3 lis 2022 · Use The National Map Viewer to explore GIS data, see availability of USGS topographic maps, and create your own web map.
3 lis 2022 · Use The National Map Viewer to explore base-layer GIS data, see availability of USGS topographic maps, and create your own web map.
Download or access The National Map data products via several applications and websites: The National Map Download Client – The primary site for data downloads. See the training videos (lessons 4a-4d) or click the Help link at the top of the Downloader for detailed instructions.
The Topographic Maps and geographical information system (GIS) data provided in The National Map are pre-generated into downloadable products often available in multiple formats. The vector datasets include: The National Hydrography Dataset(s), Watershed Boundary Dataset, Governmental Boundary Units, Transportation, Structures, Elevation ...
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Pennsylvania’s geologic maps show rock units and other geologic data with respect to their position in our state. Base layers -- such as roads, topography, and streams -- provide the references that individuals use to identify locations. Today, many base map layers are created from digital data.
The Pennsylvania Geological Survey's PaGEODE online tool provides an interactive map of the geology and natural resources of Pennsylvania, including: Surface and bedrock geology; Earthquakes; Karst features; Coal, oil, and gas resources; Sites of notable geologic interest; Street and topographic maps, and aerial images