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1. Aquatic Ecoregions in the United States GIS Data for the EPA Clean Air Mapping and Analysis Program (C-MAP) [AQUAECO]
Ecoregions are based on perceived patterns of a combination of causal and integrative factors including land use, land surface form, potential natural vegetation, and soils (Omernik, 1987). This is ...


2. Climate Division of the United States GIS Data for the EPA Clean Air Mapping and Analysis Program (C-MAP) [CLIMDIV]
This is a coverage of climate divisions from the National Climatic Data Center. The purpose of this data set is to display seasonal maps of precipitation and temperature in the National Water Summary ...


3. Digital Line Graphs of U.S. Streams for the EPA Clean Air Mapping and Analysis Program (C-MAP) [Stream_GIS_USGS]
This is a 1:2,000,000 coverage of streams for the conterminous United States. This coverage was intended for use as a background display for the National Water Summary program. The stream layer was ...


4. GIS Coverage for the National Water-Quality Assessment (NAWQA) Program Retrospective Database for Nutrients in Surface Water: Monitoring Locations [NAWQAHIS]
The retrospective database is a compilation of historical water-quality and ancillary data collected before NAWQA Study Units initiated sampling in 1993. This coverage contains the point locations ...


5. GIS Coverage of the National Water-Quality Assessment (NAWQA) Program Trace Elements Sampling Sites for the EPA Clean Air Mapping and Analysis Program (C-MAP) [NAWQA_TE]
This is a point coverage of the sampling sites for the U.S. Geological Survey National Water-Quality Assessment (NAWQA) Program Study-Unit investigations of Trace Elements for the conterminous United ...


6. GIS Coverage of the National Water-Quality Assessment Study-Unit Investigations in the conterminous United States (NAWQA) [NAWQA]
This is a coverage of the boundaries and codes used for the U.S. Geological Survey National Water-Quality Assessment (NAWQA) Program Study-Unit investigations for the conterminous United States, excluding ...


7. Hydrologic Units Maps of the Conterminous United States for the EPA Clean Air Mapping and Analysis Program (C-MAP) [HUC250k]
The Geographic Information Retrieval and Analysis System (GIRAS) was developed in the mid 70s to put into digital form a number of data layers which were of interest to the USGS. One of these data ...


8. Acidic Surface Waters of the Conterminous United States GIS Data for the EPA Clean Air Mapping and Analysis Program (C-MAP) [A_Water_EPA]
This coverage contains information about estimates of current acid-base status of surface waters in National Surface Water Survey regions in the conterminous U.S., as reported in the National Acid ...


9. Forest Land Distribution Data for the United States: USDA, Forest Service, Southern Forest Experiment Station, Starkville MS [USDA_FSSFES_FOREST]
Data and metadata are provided for the Continental United States, Alaska, and Hawaii. Information on Forset type and density are provided in the data sets which are available in GIF image format, ...


10. GIS Coverage of the National Water Quality Assessment Program: Surface Water Nutrient Sampling Sites for the EPA Clean Air Mapping and Analysis Program (C-MAP) [NAWQA_NU]
This is a point coverage of the sampling sites for the U.S. Geological Survey National Water-Quality Assessment (NAWQA) Program Study-Unit investigations of Surface Water Nutrients for the conterminous ...


11. Interagency Monitoring of Protected Visual Environments Program (IMPROVE) Yearly Data by Season for the EPA Clean Air Mapping and Analysis Program (C-MAP) [IMPROVE_Coverage_Yearly]
This data set contain the yearly data by season for the IMPROVE Program monitoring sites. IMPROVE, or the Interagency Monitoring of Protected Visual Environments Program, is helping the National ...


12. Major Land Resource Areas of the U.S. (MLRA) [MSU0026]
The Major Land Resource Areas of the U.S. (MLRA) contains natural resource information for the United States at a scale of 1:7,500,000. The MLRA and LRR (Land Resource Regions) boundaries are developed ...


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