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USGS - science for a changing world

Cumulus Portal for Geospatial Data

 
    Map services offer direct access to data without the need to completely download it and prepare local services. The information below describes the data sets that have services available and how to access those services

High Resolution Orthoimagery (HRO)
High Resolution Orthoimagery features major U.S. urban areas, state capitals, famous attractions, county, and state imagery at 3-inch, 6-inch, 1-foot, and 2.5-foot spatial resolutions. (Objects roughly these sizes are identifiable.) New images are become available depending on the location, resolution requirements, partnerships, and USGS contracts. High Resolution Orthoimagery provides a critical tool for those involved in development decisions such as resource managers and city planners. Because of its detailed focus, with High Resolution Orthoimagery emergency responders can determine the best evacuation routes, quickly designate alternatives, and plan safe access to aid. High Resolution Orthoimagery allows law enforcement to judge the best locations to place surveillance cameras in high-traffic urban areas and popular attractions.

Service Access List Data Availability (graphic) Data Availability (list)

Specifications
Resolution Type Projection Horizontal Datum Format Coverage
Ranges from 0.25 foot to 2.5 foot, depending on dataset. Black & White Color Infrared 4 Band (Color & Infrared) State Plane or UTM, depending on the dataset NAD83, unless otherwise specified TIFF with world file. Other formats available upon online download. Areas in the Conterminous U.S., Puerto Rico, and Portions of Alaska and Hawaii

U.S. Department of Agriculture (USDA) National Agriculture Imagery Program (NAIP)
U.S. Department of Agriculture (USDA) National Agriculture Imagery Program (NAIP) acquires imagery during the agricultural peak growing seasons for the conterminous United States. These "leaf-on" orthophoto images are at 1-meter (just over 3 feet) or 2-meter spatial resolutions. (Objects roughly these sizes are identifiable.) The 1-meter imagery provides updated digital orthophoto imagery. The 2-meter imagery supports the USDA Farm Services programs that require current imagery acquired during the agricultural growing season but do not require a higher resolution, such as crop compliance, farm acreage, and Common Land Unit (CLU) boundaries. Included in this imagery category is 1 meter data acquired through state programs as "leaf-off".

Service Access List Data Availability (graphic)

Specifications
Resolution Type Projection Horizontal Datum Format Coverage
1 meter Color "Leaf-on" Color "leaf-off" in certain areas. UTM NAD83 TIFF with world file. Other formats available upon online download. Conterminous U.S. and Portions of Alaska

U.S. Mexico and Canadian Border Special Acquisition Imagery
Orthoimagery was acquired along the U.S. - Mexico border from Texas to California and the U.S. - Canadian border from Maine to Washington. The imagery was flown in late 2008 and early 2009 at a 0.30 meter pixel resolution in natural color. The coverage extends ten miles into Mexico and Canada and thirty miles into the U.S.. The data is public domain and available via web mapping services, online downloads, and bulk media distribution.

Service Access List

Specifications
Resolution Type Projection Horizontal Datum Format Coverage
0.30 meter Natural Color UTM NAD83 TIFF with world file. Other formats available upon online download. U.S. - Mexico Border from Texas to California (10 miles into Mexico and Canada, 30 miles into U.S.)

National Elevation Dataset (NED)
The National Elevation Dataset (NED) is derived mainly from 10 meter to 30 meter high resolution, best quality digital elevation data covering the United States, Puerto Rico, and the Virgin Islands. This is a seamless product updated bimonthly to incorporate the best available Digital Elevation Model (DEM)-a digital representation of cartographic information. NED is available in spatial resolutions of 1 arc-second (roughly 30 meters), 1/3 arc-second (roughly 10 meters), and 1/9 arc-second (roughly 3 meters).

NED 1 arc-second covers the conterminous United States, Hawaii, Puerto Rico, and the Virgin Islands. Alaska NED is at 2 arc-second or roughly 60 meters.

These digital elevation datasets are essential in understanding the Earth`s landscape: elevation, slope, and aspect (direction a slope faces.) NED is critical to identifying and modeling geologic features such as water drainage channels and basins, watersheds, peaks and pits, and land movements such as avalanches.

NED is used to create relief maps, 3-D visualizations, to classify land cover and to geometrically correct data from satellite or aircraft sensors (orthorectification). The fire community, natural resource managers, urban planners, conservationist, emergency responders, communication companies to name a few all rely on these elevation datasets.

Service Access List Data Availability (graphic)

Specifications
Resolution Projection Horizontal Datum Vertical Datum Vertical Units Format Coverage
1 arc-second (approx. 30m)- Cont. U.S., HI, PR, & VI(approx. 60m) - AK Geographic NAD83 NAVD88 Meters ArcGrid, Bil, Bil_16 Integer, TIFF, GridFloat Conterminous U.S., HI, PR, VI, and Territorial Islands

National Elevation Dataset 1/9 Arc-Second (NED 1/9)
NED 1/9 Arc-Second currently covers sections of the United States such as the Puget Sound area of Washington State, areas hit by Hurricane Katrina, and portions of Maryland, to name a few, with a resolution of roughly 3 meters. Light Detection and Ranging (Lidar) data, a type of laser radar, is used to create these elevation datasets.

Service Access List Data Availability (graphic)

Specifications
Resolution Projection Horizontal Datum Vertical Datum Vertical Units Format Coverage
1/9 arc-second (approx. 3m) Geographic NAD83 NAVD88 Meters ArcGrid, Bil, Bil_1,Integer, TIFF, GridFloat Areas in the Conterminous U.S.

National Elevation Dataset 1/3 Arc-Second (NED 1/3)
NED 1/3 Arc-Second covers approximately 95 percent of the conterminous United States and Hawaii. However, the source data with a resolution of 10-meters or better currently exists for only 66 percent of that area. A portion of the current 1/3 arc-second NED coverage is derived from oversampling of 30-meter Digital Elevation Model (DEM) source data. The NED spatial metadata explains the source data used to produce the 1/3 arc-second NED over any given area. This is a seamless product updated bimonthly to incorporate the best available DEM.

Service Access List Data Availability (graphic)

Specifications
Resolution Projection Horizontal Datum Vertical Datum Vertical Units Format Coverage
1/3 arc-second (approx. 10m) Geographic NAD83 - Cont.U.S., HI, and portion of AK NAVD88 Meters ArcGrid, Bil, Bil_1 Integer, TIFF, GridFloat Conterminous U.S., HI, and Portions of AK

National Land Cover Database 2006 Land Cover
NLCD 2006 quantifies land cover and land cover change between the years 2001 to 2006 and provides an updated version of NLCD 2001. These products represent the first time this type of 30-meter cell land cover change has been produced for the conterminous United States. Products were generated by comparing spectral characteristics of Landsat imagery between 2001 and 2006, on an individual path/row basis, using protocols to identify and label change based on the trajectory from NLCD 2001 products. A formal accuracy assessment of the NLCD 2006 land cover change product is planned for 2011.

Generation of NLCD 2006 products helped to identify some update issues in the NLCD 2001 land cover and percent developed imperviousness products only (there were no changes to the NLCD 2001 percent canopy). These issues were evaluated and corrected, necessitating a reissue of NLCD 2001 products (NLCD 2001 Version 2.0) as part of the NLCD 2006 release. A majority of NLCD 2001 updates occur in coastal mapping zones where NLCD 2001 was published prior to the National Oceanic and Atmospheric Administration (NOAA) Coastal Change Analysis Program (C-CAP) 2001 land cover products. NOAA C-CAP 2001 land cover has now been seamlessly integrated with NLCD 2001 land cover for all coastal zones. NLCD 2001 percent developed imperviousness was also updated as part of this process.

Service Access List Data Availability (graphic)

Specifications
Resolution Projection Horizontal Datum Format Coverage
1 arc-second (approx. 30m) - Conterminous U.S. Albers Conical Equal Area NAD83 TIFF with world file Conterminous U.S.

National Land Cover Database 2006 Impervious Surfaces
The National Land Cover Database products are created through a cooperative project conducted by the Multi-Resolution Land Characteristics (MRLC) Consortium. The MRLC Consortium is a partnership of federal agencies (www.mrlc.gov), consisting of the U.S. Geological Survey (USGS), the National Oceanic and Atmospheric Administration (NOAA), the U.S. Environmental Protection Agency (EPA), the U.S. Department of Agriculture (USDA), the U.S. Forest Service (USFS), the National Park Service (NPS), the U.S. Fish and Wildlife Service (FWS), the Bureau of Land Management (BLM) and the USDA Natural Resources Conservation Service (NRCS). Previously, NLCD consisted of three major data releases based on a 10-year cycle. These include a circa 1992 conterminous U.S. land cover dataset with one thematic layer (NLCD 1992), a circa 2001 50-state/Puerto Rico updated U.S. land cover database (NLCD 2001) with three layers including thematic land cover, percent imperviousness, and percent tree canopy, and a 1992/2001 Land Cover Change Retrofit Product. With these national data layers, there is often a 5-year time lag between the image capture date and product release. In some areas, the land cover can undergo significant change during production time, resulting in products that may be perpetually out of date. To address these issues, this circa 2006 NLCD land cover product (NLCD 2006) was conceived to meet user community needs for more frequent land cover monitoring (moving to a 5-year cycle) and to reduce the production time between image capture and product release.

Service Access List Data Availability (graphic)

Specifications
Resolution Projection Horizontal Datum Format Coverage
1 arc-second (approx. 30m) -Conterminous U.S. Albers Conical Equal Area NAD83 TIFF with world file Conterminous U.S.

National Land Cover Database 2001 Land Cover
The National Land Cover Database 2001 (NLCD 2001) is the next generation land cover classification for the Nation and the first that will include Hawaii, Alaska, and Puerto Rico. The NLCD 2001 details 21 classes of land cover for the entire United States and Puerto Rico, plus a per-pixel estimate of the imperviousness of the land cover and the percentage of tree canopy. The increased effectiveness of this database comes from using 1,780 Landsat 5 and Landsat 7 images from the spring, summer, and fall growing seasons over a 2-year period as well as ancillary data such as the slope, aspect (exposure), elevation, and topographic position. The process began with the preclassification of similar land cover into 66 mapping zones for the conterminous United States and 13 zones for Alaska. The spatial resolution is 30 meters (roughly 98 feet), so scientists can identify objects slightly larger than a baseball diamond. Land cover affects the very basics needed to sustain life. It is also constantly changing. Land cover affects climate, air quality, water safety, the spread of disease, the ability to control natural disasters such as flooding or wildfires, the variety and health of agriculture and ranching, transportation, and communication technology. Land cover influences community and individual prosperity.

Service Access List Data Availability (graphic)

Specifications
Resolution Projection Horizontal Datum Format Coverage
1 arc-second (approx. 30m) - Conterminous U.S. Albers Equal Area Conic NAD83 TIFF with world file Conterminous U.S. HI and AK

National Land Cover Database 2001 Impervious Surfaces
For a more precise mapping of urban density, the 2001 database includes a per-pixel estimate of the imperviousness of the land cover. Rooftops, roads, and parking lots are impenetrable to water and affect climate, water runoff and evaporation, and flooding.

Service Access List Data Availability (graphic)

Specifications
Resolution Projection Horizontal Datum Format Coverage
1 arc-second (approx. 30m) -Conterminous U.S. Albers Equal Area Conic NAD83 TIFF with world file Conterminous U.S. HI and AK

National Land Cover Database 2001 Tree Canopy
Tree canopy measures the per-pixel density of tree cover across the United States and Puerto Rico. Tree canopy affects climate, the level of humidity underneath the canopy, soil erosion, and the amount of sunlight and rain reaching the ground.

Service Access List Data Availability (graphic)

Specifications
Resolution Projection Horizontal Datum Format Coverage
1 arc-second (approx. 30m)-Conterminous U.S. Albers Equal Area Conic NAD83 TIFF with world file Conterminous U.S. HI and AK

National Land Cover Database 1992 Land Cover
NLCD 92 (National Land Cover Data 1992) is a 21-category land cover classification scheme that has been applied consistently over the conterminous U.S. It is based primarily on the unsupervised classification of Landsat TM (Thematic Mapper) 1992 imagery. Ancillary data sources included topography, census, agricultural statistics, soil characteristics, other land cover maps, and wetlands data. The NLCD 92 classification is provided as raster data with a spatial resolution of 30 meters.

The seamless product consists of NLCD 92 for the conterminous U.S., which is provided according to a user-specified area of coverage. The data is expressed in geographic coordinates (latitude/longitude), and it is referenced to the North American Datum of 1983 (NAD83).

Service Access List

Specifications
Resolution Projection Horizontal Datum Format Coverage
1 arc-second (approx. 30m) - Conterminous U.S. Albers Equal Area Conic NAD 83 TIFF with world file Conterminous U.S.

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Page Last Modified: September 14, 2010