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Geospatial datasets
Collections of related digital information that are geographically referenced.
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National Hydrography Dataset (NHD) [More info]
Main page for National Hydrography Dataset (NHD), a comprehensive set of digital spatial data about surface water features, with links to references, data, software tools, applications, tutorials, technical support, and data maintenance.
New England states aeromagnetic and gravity maps and data [More info]
Aeromagnetic surveys of New England, merged to form seamless grids across the state. Gravity anomaly data are provided as well. Data provided in a variety of formats.
Nonindigenous aquatic species alert system [More info]
Reports indicating locations where non-indigenous aquatic organisms have been collected. Includes RSS feed you can subscribe to.
Resource materials for a GIS spatial analysis course [More info]
This report consists of materials prepared for a GIS spatial analysis course intended for instructors preparing spatial-modeling training and scientists with advanced GIS expertise. Downloads available in many formats (PDF, ArcView, Word, etc.)
San Francisco Bay Area Regional Database (BARD) [More info]
Download or view digital elevation models of this area.
Tampa Bay Estuary Interactive Mapping System (IMS) [More info]
Interactive Mapping Service (IMS) is an Internet based Geographic Information System designed to provide users with online mapping capability of habitats, land use and land cover, and seagrass for areas of Tampa Bay.
PDF The National Land Cover Database [More info]
The National Land Cover Database (NLCD) serves as the definitive Landsat-based, 30-meter resolution, land cover database for the Nation.
Upper Mississippi River land cover and land use data [More info]
Maps and GIS data depicting land use and land cover in areas near the upper Mississippi River. Historical data are available, dating from the 1890s, 1975, and more regularly from the late 1980s to 2000.
USGS East-coast sediment analysis: analysis, procedures, database and georeferenced displays [More info]
Grain-size analysis of marine sediments of the U.S. eastern coast with sampling and lab methods, surficial sediment database in three formats (Excel, Dbase IV, ASCII), and use of geographic mapping tools for visualizing sediment data layers.
Water resources data for Washington [More info]
Access to data on water resources of Washington including surface water, ground water, water quality, water use, GIS, and biological datasets and access to reports.
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