GNS Home. USGS TNM 2.0 Viewer. FEMA Flood Map KMZ. Now Available!
National Flood Hazard Layer (NFHL) Geographic Information Systems (GIS) Data for Download. The following changes have been made to the MSC Product Catalog and Map Search: NFHL Data are now searchable through Map Search NFHL databases are downloadable from MSC Product Catalog Effective FIRM Databases are no longer be available for purchase and users will instead be directed to download the effective NFHL data at no charge. Future Effective FIRM Databases are still available for purchase Contents. GIS Data Finder. OpenData - Free GIS Data Tips, Publications and Open Resources. GIS - National Park Service Geographic Information Systems (GIS) Water Resources: Maps and GIS Data. Free GIS Data - GIS Data Depot.