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  1. Title: Hazardous Materials Routes: United States, 2012

    Contributors:

    Summary: This polyline shapefile depicts FMCSA Hazardous Material Routes that were developed using the 2004 First Edition Topologically Integrated Geographic Encoding and Referencing (TIGER/Line) database files. The routes are described in the National Hazardous Material Route Registry (NMHRR). With the exception of 13 features that were not identified with the TIGER/Line shapefiles, Hazmat routes were created by extracting the TIGER/Line segments that corresponded to each individual route. Hazmat routes in the National Transporation Atlas Database (NTAD), are organized into 3 database files, hazmat.shp, hmroutes.dbf and hmstcnty.dbf. Each record in each database represents a unique TIGER/Line segment. These TIGER/Line segments are grouped into routes identified as character strings in the ROUTE_ID field in the hmroutes.dbf table. The route name appearing in the ROUTE_ID is assigned by FMCSA and is unique for each state. The hmstcnty.dbf table allows the user to select routes by state and county. A single shapefile, called hazmat.shp, represents geometry for all routes in the United States. This layer is part of the 2014 National Transportation Atlas Database. The National Transportation Atlas Databases 2014 (NTAD2014) is a set of nationwide geographic datasets of transportation facilities, transportation networks, associated infrastructure and other political and administrative entities. These datasets include spatial information for transportation modal networks and intermodal terminals, as well as the re¬lated attribute information for these features. This data supports research, analysis, and decision-making across all transportation modes. It is most useful at the national level, but has major applications at regional, state and local scales throughout the transportation community. The data used to compile NTAD2014 was provided by our partners within the United States Department of Transportation (USDOT) and by other agencies throughout the United States Federal Government. These contributors are the actual data stewards and are ultimately responsible for the maintenance and accuracy of their data. The mission of the Federal Motor Carrier Safety Administration (FMCSA) is to improve truck and bus safety on our nation's highways. That includes reducing the number of transportation incidents that involve hazardous materials and could potentially harm the public and the environment. Developing programs to accomplish these goals and increase the safety of hazardous material transportation is the responsibility of the FMCSA Hazardous Materials (HM) Program. United States. Department of Transportation. Research and Innovative Technology Administration. (2014). Hazardous Materials Routes: United States, 2012. National Transportation Atlas Database 2014. Available at: http://purl.stanford.edu/wq515wj4269. The data provided is in the native Latitude/Longitude coordinate system inherited from the TIGER/Line data.

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  2. Title: Prime and important farmlands, New Mexico

    Contributors:

    Summary: Relief shown by contours and spot heights.; Shows land use.; "September 1985 4-39456." 65 x 55 centimeters

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  3. Title: Important farmlands, McCook County, South Dakota

    Contributors:

    Summary: Shows land use.; "Interpretations derived from soil survey published in 1980."; "September 1985, 4-R-39374."; Includes vicinity map and text. 43 x 61 centimeters

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  4. Title: Geologic map of the San Diams and Ontario quadrangles, Los Angeles and San Bernardino counties, California

    Contributors:

    Summary: by Thomas W. Dibblee, Jr. ; edited by John A. Minch. Relief shown by contours and spot heights. "Topographic base map from newest available USGS 7.5-minute quadrangle SAN DIMAS, CA 1981, ONTARIO, CA 1981, NIMA 2452 IV SE - Series V895." "Prepared in cooperation with the Santa Barbara Museum of Natural History." "Jack G. Vedder Honorary Map." "First printing, July 2002." Includes quadrangle location map, index to adjacent 7.5 minute quadrangles, and index to sources of geology. Includes bibliographical references.

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  5. Title: Coal Mines, Surface and Underground, United States, 2012

    Contributors:

    Summary: This point shapefile represents operating surface and underground coal mines in the United States as of 2012 These data originate from the U.S. Energy Information Administration, Form EIA-7A "Coal Production and Preparation Report" and the U.S. Department of Labor, Mine Safety and Health Administration Form 7000-2, "Quarterly Mine Employment and Coal Production Report." This layer is part of a collection of GIS data produced by the U.S. National Energy Information Administration. This dataset is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. National Energy Information Center (U.S.). (2015). Coal Mines, Surface and Underground, United States, 2012. National Energy Information Center. Available at: http://purl.stanford.edu/mn565xr9255. For additional mine data see "Historical Detailed Coal Production Data": http://www.eia.gov/coal/data.cfm#production The U.S. Energy Information Administration shall not be held liable for improper or incorrect use of the data described and/or contained herein. These data and related graphics, if available, are not legal documents and are not intended to be used as such. The information contained in these data is dynamic and may change over time. The U.S. Energy Information Administration gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

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  6. Title: Petroleum Refineries, United States, 2014

    Contributors:

    Summary: This point shapefile represents all operating petroleum refineries located in the United States, Puerto Rico, Guam, the U.S. Virgin Islands, and other U.S. Territories as of January 1, 2014. These data originate from the U.S. Energy Information Administration, Refinery Capacity Report, (EIA-820) Table 3, Capacity of Operable Petroleum Refineries by State. In addition to the sources listed, accuracy for the locations of facilities shown on the map was improved through the use of publicly available sites such as company websites and satellite images from public websites. This layer is part of a collection of GIS data produced by the U.S. National Energy Information Administration. This dataset is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. National Energy Information Center (U.S.). (2015). Petroleum Refineries, United States, 2014. National Energy Information Center. Available at: http://purl.stanford.edu/sn471sh5118. EIA-820 report: http://www.eia.gov/petroleum/refinerycapacity/table3.pdf. The U.S. Energy Information Administration shall not be held liable for improper or incorrect use of the data described and/or contained herein. These data and related graphics, if available, are not legal documents and are not intended to be used as such. The information contained in these data is dynamic and may change over time. The U.S. Energy Information Administration gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data.

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  7. Title: Petroleum Product Terminals, United States, 2014

    Contributors:

    Summary: This point shapefile represents all operable bulk petroleum product terminals located in the 50 States and the District of Columbia with a total bulk shell storage capacity of 50,000 barrels or more, and/or ability to receive volumes from tanker, barge, or pipeline. Survey locations were adjusted using public data. These data were gathered from "EIA-815, Monthly Bulk Terminal and Blender Report." These data are current as of November 2014. This layer is part of a collection of GIS data produced by the U.S. National Energy Information Administration. This dataset is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. National Energy Information Center (U.S.). (2015). Petroleum Product Terminals, United States, 2014. National Energy Information Center. Available at: http://purl.stanford.edu/kx379sb6876. The U.S. Energy Information Administration shall not be held liable for improper or incorrect use of the data described and/or contained herein. These data and related graphics, if available, are not legal documents and are not intended to be used as such. The information contained in these data is dynamic and may change over time. The U.S. Energy Information Administration gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data.

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  8. Title: Liquefied Natural Gas Import/Export Terminals, United States, 2012

    Contributors:

    Summary: This point shapefile represents liquefied natural gas import/export terminals in the United States. The data exclude the import facility in Puerto Rico. These data were gahtered from the U.S. Energy Information Administration and the Federal Energy Regulatory Commission and were last updated in September 2012. Terminals capable of liquefaction of natural gas for transport (Kenai, AK), or receipt and regasification of LNG for use as natural gas (GA - Elba Island; LA - Cameron, Lake Charles, Gulf Gateway Deepwater Port, and Sabine Pass; MA - Everett, Neptune, and Northeast Gateway Energy Bridge; MD - Cove Point; PR - Peñuelas; TX - Freeport and Golden Pass). This layer is part of a collection of GIS data produced by the U.S. National Energy Information Administration. This dataset is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. National Energy Information Center (U.S.). (2015). Liquefied Natural Gas Import/Export Terminals, United States, 2012. National Energy Information Center. Available at: http://purl.stanford.edu/rm745tc7680. The U.S. Energy Information Administration shall not be held liable for improper or incorrect use of the data described and/or contained herein. These data and related graphics, if available, are not legal documents and are not intended to be used as such. The information contained in these data is dynamic and may change over time. The U.S. Energy Information Administration gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data.

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  9. Title: Natural Gas Processing Plants, United States, 2012-2013

    Contributors:

    Summary: This point shapefile represents natural gas processing plants in the United States in 2012 with select updates through 2013. Zip code centroids are used for map location. These data were gathered from the EIA-757, Natural Gas Processing Plant Survey. This layer is part of a collection of GIS data produced by the U.S. National Energy Information Administration. This dataset is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. National Energy Information Center (U.S.). (2015). Natural Gas Processing Plants, United States, 2012-2013. National Energy Information Center. Available at: http://purl.stanford.edu/md188gh4020. The U.S. Energy Information Administration shall not be held liable for improper or incorrect use of the data described and/or contained herein. These data and related graphics, if available, are not legal documents and are not intended to be used as such. The information contained in these data is dynamic and may change over time. The U.S. Energy Information Administration gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data.

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  10. Title: Natural Gas Interstate and Intrastate Pipelines, United States, 2014

    Contributors:

    Summary: This line shapefile represents the major natural gas transmission pipelines in the U.S. including interstate, intrastate, and gathering pipelines as of November 2014. These data were obtained by the U.S. Energy Information Administration from various sources including FERC Form 567—Annual Report Of System Flow Diagrams and Capacity, and other external sources such as company web pages and industry press. This layer is part of a collection of GIS data produced by the U.S. National Energy Information Administration. This dataset is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. National Energy Information Center (U.S.). (2014). Natural Gas Interstate and Intrastate Pipelines, United States, 2014. National Energy Information Center. Available at: http://purl.stanford.edu/nb980gq7004. The U.S. Energy Information Administration shall not be held liable for improper or incorrect use of the data described and/or contained herein. These data and related graphics, if available, are not legal documents and are not intended to be used as such. The information contained in these data is dynamic and may change over time. The U.S. Energy Information Administration gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data.

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  11. Title: Petroleum Product Pipelines, United States, 2014

    Contributors:

    Summary: This line shapefile represents major petroleum product pipelines in the United States as of November 2014. This layer includes interstate trunk lines and selected intrastate lines and is based on publicly available data from a variety of sources with varying scales and levels of accuracy. This layer is part of a collection of GIS data produced by the U.S. National Energy Information Administration. This dataset is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. National Energy Information Center (U.S.). (2014). Petroleum Product Pipelines, United States, 2014. National Energy Information Center. Available at: http://purl.stanford.edu/yk129yw8320. The U.S. Energy Information Administration shall not be held liable for improper or incorrect use of the data described and/or contained herein. These data and related graphics, if available, are not legal documents and are not intended to be used as such. The information contained in these data is dynamic and may change over time. The U.S. Energy Information Administration gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data.

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  12. Title: Hydrocarbon Gas Liquid Pipelines, United States, 2014

    Contributors:

    Summary: This line shapefile represents major hydrocarbon gas liquid (HGL) pipelines in the United States as of November 2014. HGL refers to both the natural gas liquids (paraffins or alkanes) and olefins (alkenes) produced by natural gas processing plants, fractionators, crude oil refineries, and condensate splitters but excludes liquefied natural gas (LNG) and aromatics. HGL is both fuel and feedstock in various markets (petrochemicals, residential heating/cooking, agriculture, and motor fuel blending). Seasonal and regional fluctuations in these end-use sectors, including export markets, affect investment and production decisions throughout the upstream, midstream, and downstream sectors of the oil and gas industry. Billions of dollars have been invested recently in the field gathering systems, lease separators, crude/condensate stabilizers, natural gas processing plants, fractionation facilities, refineries, condensate splitters, pipelines, storage caverns, rail terminals, port facilities, ethylene crackers, and other petrochemical plants that constitute HGL infrastructure. This layer includes interstate trunk lines and selected intrastate lines and are based on publicly available data from a variety of sources with varying scales and levels of accuracy. This layer is part of a collection of GIS data produced by the U.S. National Energy Information Administration. This dataset is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. National Energy Information Center (U.S.). (2014). Hydrocarbon Gas Liquid Pipelines, United States, 2014. National Energy Information Center. Available at: http://purl.stanford.edu/tr705zj4339. The U.S. Energy Information Administration shall not be held liable for improper or incorrect use of the data described and/or contained herein. These data and related graphics, if available, are not legal documents and are not intended to be used as such. The information contained in these data is dynamic and may change over time. The U.S. Energy Information Administration gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data.

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  13. Title: Natural Gas Underground Storage Facilities, United States, 2014

    Contributors:

    Summary: This point shapefile represents underground natural gas storage fields in the United States as of July 2014. County centroids are used for map location. These data were gathered from EIA-191, Monthly Underground Gas Storage Report. This layer is part of a collection of GIS data produced by the U.S. National Energy Information Administration. This dataset is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. National Energy Information Center (U.S.). (2014). Natural Gas Underground Storage Facilities, United States, 2014. National Energy Information Center. Available at: http://purl.stanford.edu/tb598wt7743. CREDIT The U.S. Energy Information Administration shall not be held liable for improper or incorrect use of the data described and/or contained herein. These data and related graphics, if available, are not legal documents and are not intended to be used as such. The information contained in these data is dynamic and may change over time. The U.S. Energy Information Administration gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data.

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  14. Title: Power Plants, United States, 2014

    Contributors:

    Summary: This point shapefile represents electric power generating plants in the United States by energy source. This includes plants that are operating, on standby, or short- or long-term out of service. The surveys collect data on all plants with a combined nameplate capacity of 1 MW or more. These data were gathered from EIA-860, Annual Electric Generator Report, EIA-860M, Monthly Update to the Annual Electric Generator Report, and EIA-923, Power Plant Operations Report. These data are current as of August 2014. This layer is part of a collection of GIS data produced by the U.S. National Energy Information Administration. This dataset is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. National Energy Information Center (U.S.). (2014). Power Plants, United States, 2014. National Energy Information Center. Available at: http://purl.stanford.edu/cc957ty2116. The U.S. Energy Information Administration shall not be held liable for improper or incorrect use of the data described and/or contained herein. These data and related graphics, if available, are not legal documents and are not intended to be used as such. The information contained in these data is dynamic and may change over time. The U.S. Energy Information Administration gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data.

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  15. Title: Petroleum Administration for Defense Districts, United States, 2014

    Contributors:

    Summary: This polygon shapefile contains petroleum administration areas for defense districts (PADDs) within the United States as of 2014. PADDs are geographic aggregations of the 50 States and the District of Columbia into five districts: PADD 1 is the East Coast, PADD 2 the Midwest, PADD 3 the Gulf Coast, PADD 4 the Rocky Mountain Region, and PADD 5 the West Coast. Due to its large population, PADD 1 is further divided into sub-PADDs, with PADD 1A as New England, PADD 1B the Central Atlantic States, and PADD 1C comprising the Lower Atlantic States. There are two additional PADDs (PADDs VI and VII) that encompass U.S. Territories (these are not pictured on the map). The PADDs help users of the Energy Information Administration's petroleum data assess regional petroleum product supplies. This layer is part of a collection of GIS data produced by the U.S. National Energy Information Administration. This dataset is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. National Energy Information Center (U.S.). (2014). Petroleum Administration for Defense Districts, United States, 2014. National Energy Information Center. Available at: http://purl.stanford.edu/qx317fs8189. The U.S. Energy Information Administration shall not be held liable for improper or incorrect use of the data described and/or contained herein. These data and related graphics, if available, are not legal documents and are not intended to be used as such. The information contained in these data is dynamic and may change over time. The U.S. Energy Information Administration gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data.

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  16. Title: Crude Oil Pipelines, United States, 2014

    Contributors:

    Summary: This line shapefile represents crude oil pipelines in the United States as of Novemeber 2014. These data include interstate trunk lines and selected intrastate lines but exclude gathering lines. This layer was created from publicly available data from a variety of sources with varying scales and levels of accuracy. These data are not visible if zoomed in beyond 1:1,000,000 scale. This layer is part of a collection of GIS data produced by the U.S. National Energy Information Administration. This dataset is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. National Energy Information Center (U.S.). (2014). Crude Oil Pipelines, United States, 2014. National Energy Information Center. Available at: http://purl.stanford.edu/cw906dp5331. The U.S. Energy Information Administration shall not be held liable for improper or incorrect use of the data described and/or contained herein. These data and related graphics, if available, are not legal documents and are not intended to be used as such. The information contained in these data is dynamic and may change over time. The U.S. Energy Information Administration gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data.

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  17. Title: Ethylene Crackers, United States, 2014

    Contributors:

    Summary: This point shapefile identifies ethylene crackers in the United States as of October 2014. Ethylene crackers are petrochemical complexes that process ethane into ethylene. This layer is part of a collection of GIS data produced by the U.S. National Energy Information Administration. This dataset is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. National Energy Information Center (U.S.). (2014). Ethylene Crackers, United States, 2014. National Energy Information Center. Available at: http://purl.stanford.edu/dq526np3789. The U.S. Energy Information Administration shall not be held liable for improper or incorrect use of the data described and/or contained herein. These data and related graphics, if available, are not legal documents and are not intended to be used as such. The information contained in these data is dynamic and may change over time. The U.S. Energy Information Administration gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data.

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  18. Title: Crude Oil Rail Terminals, United States, 2014

    Contributors:

    Summary: This point shapefile contains crude oil rail terminals in the United States as of November 2014. These rail terminals support the loading and unloading of crude oil. This layer was created from publicly available data from a variety of sources with varying scales and levels of accuracy. These data are not visible if zoomed in beyond 1:1,000,000 scale. This layer is part of a collection of GIS data produced by the U.S. National Energy Information Administration. This dataset is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. National Energy Information Center (U.S.). (2014). Crude Oil Rail Terminals, United States, 2014. National Energy Information Center. Available at: http://purl.stanford.edu/qq802mt3140. The U.S. Energy Information Administration shall not be held liable for improper or incorrect use of the data described and/or contained herein. These data and related graphics, if available, are not legal documents and are not intended to be used as such. The information contained in these data is dynamic and may change over time. The U.S. Energy Information Administration gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data.

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  19. Title: Natural Gas Market Hubs, United States, 1996-2009

    Contributors:

    Summary: This point shapefile represents natural gas market hubs in the United States for 1996-2009. A hub is a physical transfer point for natural gas where several pipelines are connected. A market center is a hub where the operator offers services that facilitate the buying, selling, and transportation of natural gas. This is a point dataset representing natural gas transmission hubs in the continguous U.S. This layer is part of a collection of GIS data produced by the U.S. National Energy Information Administration. This dataset is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. National Energy Information Center (U.S.). (2013). Natural Gas Market Hubs, United States, 1996-2009. National Energy Information Center. Available at: http://purl.stanford.edu/kf767xb0523. For additional information, see "Natural Gas Market Centers: A 2008 Update": http://www.eia.gov/pub/oil_gas/natural_gas/feature_articles/2009/ngmarketcenter/ngmarketcenter.pdf The U.S. Energy Information Administration shall not be held liable for improper or incorrect use of the data described and/or contained herein. These data and related graphics, if available, are not legal documents and are not intended to be used as such. The information contained in these data is dynamic and may change over time. The U.S. Energy Information Administration gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

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  20. Title: Average Monthly Precipitation for March (Inches & Millimeters): California, 1981-2010 (800m)

    Contributors:

    Summary: This raster layer contains the average monthly precipitation levels in millimeters and inches for March 1981-2010. This dataset incorporates a conceptual framework that uniquely addresses the spatial scale and pattern of orographic precipitation. The original PRISM dataset covered the United States. This is a California-only version subsetted from the original data set and converted to California Teale Albers NAD83 using bilinear interpolation by the California Department of Fish and Game (CDFG) at 800m resolution. The grid units are presented in inches with floating point. Care should be taken in estimating precipitation values at any single point on the map. Precipitation estimated for each grid cell is an average over the entire area of that cell; thus, point precipitation can be estimated at a spatial precision no better than half the resolution of a cell. Accuracy of this data set is based on the original specification of the Defense Mapping Agency (DMA) 1 degree digital elevation models (DEMs). The stated accuracy of the original DEMs is 130m circular error with 90% probability. The Parameter-elevation Regressions on Independent Slopes Model (PRISM) Climate Group works on a range of projects, some of which support the development of spatial climate datasets. These PRISM datasets provide estimates of the basic climate element of precipitation (ppt), or the Daily total precipitation averaged over a month for both rain and melted snow. These datasets are modeled with PRISM using a digital elevation model (DEM) as the predictor grid and provide baselines describing average monthly precipitation between 1981 and 2000 to be used for display and/or analyses requiring spatially distributed monthly or annual precipitation. Grids were modeled on a monthly basis. Annual grids were produced by averaging (temperatures) or summing (precipitation) the monthly grids. California Department of Fish and Wildlife. (2007). Average Monthly Precipitation for March (Inches & Millimeters): California, 1981-2010 (800m). California Department of Fish and Wildlife. Available at: http://purl.stanford.edu/hr974vj4583. There are many methods of interpolating precipitation from monitoring stations to grid points. Some provide estimates of acceptable accuracy in flat terrain, but few have been able to adequately explain the extreme, complex variations in precipitation that occur in mountainous regions. Significant progress in this area has been achieved through the development of PRISM (Parameter-elevation Regressions on Independent Slopes Model). PRISM is an analytical model that uses point data and a digital elevation model (DEM) to generate gridded estimates of monthly and annual precipitation (as well as other climatic parameters). PRISM is well suited to regions with mountainous terrain, because it incorporates a conceptual framework that addresses the spatial scale and pattern of orographic precipitation. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

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