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The grayscale Puerto Rico and U.S. Virgin Islands shaded relief data were derived from National Elevation Dataset (NED) data, and show the terrain of Puerto Rico and U.S. Virgin Islands at a resolution of 200 meters. The NED is a raster product assembled by the U.S. Geological Survey, designed to provide national elevation data in a seamless form with a consistent datum, elevation unit, and projection. Data corrections made in the NED assembly process minimize artifacts, permit edge matching, and fill sliver areas of missing data.
This map layer consists of federally owned or administered lands of the United States, Puerto Rico, and the U.S. Virgin Islands. Only areas of 640 acres or more are included. There may be private inholdings within the boundaries of Federal lands in this map layer. This is a revised version of the December 2005 map layer.
This map layer shows isoclinic lines (lines of constant inclination of the Earth's magnetic field), derived from the International Geomagnetic Reference Field (IGRF) for the epoch 1995.0. Magnetic inclination is the angle between the magnetic field vector and the horizontal plane.
This map layer shows major ports in the United States, Puerto Rico, and the U.S.Virgin Islands. A port is a city, town, or urban area with a harbor where shipsload or unload.
This map layer portrays the major acquisitions of territory by the United States of America. Only areas in North America, the Caribbean, and Hawaii are included. Also shown are areas that were part of the United States at one time but which have been ceded to other countries.
Layered GeoPDF Quadrangle Map. Layers of geospatial data include orthoimagery, roads, grids, geographic names, elevation contours, hydrography, and other selected map features.
Layered GeoPDF Quadrangle Map. Layers of geospatial data include orthoimagery, roads, grids, geographic names, elevation contours, hydrography, and other selected map features.
This map layer consists of federally owned or administered lands of the United States, Puerto Rico, and the U.S. Virgin Islands. For the most part, only areas of 320 acres or more are included; some smaller areas deemed to be important or significant are also included. There may be private inholdings within the boundaries of Federal lands in this map layer. Some established Federal lands which are larger than 320 acres are not included in this map layer, because their boundaries were not available from the owning or administering agency.
This data set represents the extent, approximate location and type of wetlands and deepwater habitats in the United States and its Territories. These data delineate the areal extent of wetlands and surface waters as defined by Cowardin et al. (1979). Certain wetland habitats are excluded from the National mapping program because of the limitations of aerial imagery as the primary data source used to detect wetlands. These habitats include seagrasses or submerged aquatic vegetation that are found in the intertidal and subtidal zones of estuaries and near shore coastal waters. Some deepwater reef communities (coral or tuberficid worm reefs) have also been excluded from the inventory. These habitats, because of their...
Categories: Data;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Academics & scientific researchers,
Alabama,
Alabama,
Alaska,
Arizona,
This map layer shows major ports in the United States, Puerto Rico, and the U.S. Virgin Islands. A port is a city, town, or urban area with a harbor where ships load or unload. This is a revised version of the July 2012 map layer.
Categories: Data;
Types: Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Shapefile;
Tags: Academics & scientific researchers,
Alabama,
Arizona,
Arkansas,
California,
This data set portrays the incidence of certain wildlife mortality events in the United States. The data set was extracted from the U.S. Geological Survey National Wildlife Health Center's (NWHC) EPIZOO database, which is a long term data set that documents over 30 years of information on epizootics (epidemics) in wildlife. EPIZOO tracks die-offs throughout the United States and territories, primarily in migratory birds and endangered species. This data set contains information about the frequency of wildlife mortality events caused by 4 different types of agents (avian botulism, avian cholera, avian lead poisoning, and wildlife organophosphate/ carbamate poisoning) by county throughout the United States. This is...
This map layer portrays the time zones of the United States, Puerto Rico, and the U.S. Virgin Islands. Also included are the Greenwich Mean Time offset, and areas in the U.S. where daylight saving time is observed. This is a revised version of the September 2004 map layer.
This map layer shows areal and linear water features of the United States, Puerto Rico, and the U.S. Virgin Islands. The original file was produced by joining the individual State hydrography layers from the 1:2,000,000- scale Digital Line Graph (DLG) data produced by the USGS. This map layer was formerly distributed as Hydrography Features of the United States. This is a revised version of the January 2003 map layer.
When a species is proposed for listing as endangered or threatened under the Endangered Species Act, the U.S. Fish and Wildlife Service must consider whether there are areas of habitat believed to be essential the species’ conservation. Those areas may be proposed for designation as “critical habitat.” Critical habitat is a term defined and used in the Act. It is a specific geographic area(s) that contains features essential for the conservation of a threatened or endangered species and that may require special management and protection. Critical habitat may include an area that is not currently occupied by the species but that will be needed for its recovery. An area is designated as “critical habitat” after the...
Categories: Data;
Types: ArcGIS REST Map Service,
ArcGIS Service Definition,
Citation,
Downloadable,
Map Service;
Tags: Alabama,
Alaska,
Arizona,
Arkansas,
Biota,
Layered GeoPDF Quadrangle Map. Layers of geospatial data include orthoimagery, roads, grids, geographic names, elevation contours, hydrography, and other selected map features.
Types: Citation;
Tags: 7.5 x 7.5 minute,
Downloadable Data,
EarthCover,
GeoPDF,
Imagery and Base Maps,
Fish collections made at Buck Island Reef National Monument with the ichthyocide rotenone in 2001 at 58 stations followed by 10 days each in April 2011 and January 2012 surveying poorly sampled shoreline habitats with rotenone and clove oil and inland streams with seine. Attached files: Original metadata created at the Southeast Ecological Science Center - Jelks_St_Croix_2001-2012.xml Original dataset provided by M. Cannister - Jelks_St_Croix_2001-2012_orig.csv Enrollment journal used to crosswalk the original data into MBG format - OBIS-USA Enrollment Journal Virgin Islands Jelks 20140626.doc Final MBG version of the data after processing - USGS_StCroix_MarineFishesMBG_20140702.csv Intermediate file created by...
This map layer is an Arc/INFO grid map of North America, excluding Hawaii and including the Caribbean and most of Mexico, that portrays at 1 sq. km resolution an index of land cover diversity calculated at 729 sq. km. scale. The map layer was created by applying a spatial filter to a published map of seasonal land cover regions (Loveland et al. 1991) known as NASLCR1_2L which was obtained from the USGS EROS Data Center Distributed Active Archive Center (DAAC). The spatial filter computed Simpson's (1949) index of land cover diversity within 729 sq. km. (27 x 27 pixels) windows from the proportions of different land cover types within a window. The [0,1] continuous index was discretized, and a byte representation...
This map layer portrays the estimated use of water in counties in the United States, in the year 2005. The map layer was extracted from the U.S. Geological Survey Water Resources of the United States water use database, which is a long term data set that documents information on water use since 1950. This map layer contains information about water use for public supply, industrial, irrigation, mining, livestock, and thermoelectric power, by county throughout the United States.
This map layer portrays the Congressional Districts of the United States for the 106th Congress. The map layer was created by extracting lines from existing National Atlas layers that were coincident with Congressional District boundaries. In areas lacking coincident geometry, lines from 1:100,000 scale Congressional District boundaries published by the U.S. Department of Commerce, Bureau of the Census, Geography Division were generalized and integrated into the data layer.
This map layer portrays the spread, by year, of the Africanized honey bee (AHB) in the United States, Puerto Rico, and the U.S. Virgin Islands. The data indicate the year in which the AHB was first observed in a county. This map layer was previously distributed as Spread of Africanized Bees in the United States. This is a revised version of the December 2004 map layer.
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