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Bailey's Ecoregions and Subregions of the United States, Puerto Rico, and the U.S. Virgin Islands

Metadata also available as - [Outline] - [Parseable text] - [XML] - [DIF]

Frequently-anticipated questions:


What does this data set describe?

Title:
Bailey's Ecoregions and Subregions of the United States, Puerto Rico, and the U.S. Virgin Islands
Abstract:
This map layer is commonly called Bailey's ecoregions and shows ecosystems of regional extent in the United States, Puerto Rico, and the U.S. Virgin Islands. Four levels of detail are included to show a hierarchy of ecosystems. The largest ecosystems are domains, which are groups of related climates and which are differentiated based on precipitation and temperature. Divisions represent the climates within domains and are differentiated based on precipitation levels and patterns as well as temperature. Divisions are subdivided into provinces, which are differentiated based on vegetation or other natural land covers. The finest level of detail is described by subregions, called sections, which are subdivisions of provinces based on terrain features. Also identified are mountainous areas that exhibit different ecological zones based on elevation.
Supplemental_Information:
The same data are available from both the National Atlas of the United States and from the USDA Forest Service Inventory and Monitoring Institute.

Detailed descriptions of the domains, divisions, and provinces represented in this map layer are available at: <http://www.fs.fed.us/institute/ecoregions/ecoreg1_home.html>. Detailed descriptions of the sections represented in this map layer are available at: <http://www.fs.fed.us/land/pubs/ecoregions/>.

  1. How should this data set be cited?

    Service, USDA Forest , 200403, Bailey's Ecoregions and Subregions of the United States, Puerto Rico, and the U.S. Virgin Islands: National Atlas of the United States, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -127.840621
    East_Bounding_Coordinate: -65.403767
    North_Bounding_Coordinate: 51.540005
    South_Bounding_Coordinate: 22.948654

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Calendar_Date: Feb-2004
    Currentness_Reference: Publication date

  5. What is the general form of this data set?

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • GT-polygon composed of chains (3072)

    2. What coordinate system is used to represent geographic features?

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000278. Longitudes are given to the nearest 0.000278. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is GRS1980.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222.

  7. How does the data set describe geographic features?

    Ecoregion (described by ecoregp075.dbf)
    An ecosystem of regional extent. The polygons in this map layer represent subregion sections, which are the finest level of detail. Sections are further classified into provinces, divisions, and domains. (Source: National Atlas of the United States)

    Shape
    The representation of the entity in the data. (Source: National Atlas of the United States)

    ValueDefinition
    Polygon2-dimensional element

    Area
    The size of the shape in coverage units. In the distributed file, coverage units represent square decimal degrees. (Source: National Atlas of the United States)

    Range of values
    Minimum:0.000
    Maximum:34.509

    Perimeter
    The perimeter of the shape in coverage units. In the distributed file, coverage units represent decimal degrees. (Source: National Atlas of the United States)

    Range of values
    Minimum:0.010
    Maximum:65.705

    Ecoregp075
    Internal feature number. (Source: National Atlas of the United States)

    Range of values
    Minimum:2
    Maximum:3073

    Ecocode
    A five-character code that corresponds to the narrative description in the attribute Section. Ecocode and Section represent the lowest mapping level in the hierarchy of ecoregions and subregions. The first character is an indication of whether the section is mountainous. The next three digits are a code identifying the province, and the last character is a letter identifying the section within the province. (Source: USDA Forest Service)

    Range of values
    Minimum:-124A
    Maximum:M423A

    Domain
    A major ecoregion distinguished from other domains by climate, precipitation and temperature. This is the highest level in the hierarchy of ecoregions. (Source: USDA Forest Service)

    ValueDefinition
    Dry domainAn ecoregion whose most important characteristic is the dryness of the environment. This domain annually loses more water through evaporation from the surface than it gains through precipitation.
    Humid temperate domainAn ecoregion located in the middle latitudes and with a climate controlled by both tropical and polar air masses. This domain has pronounced seasons with strong annual cycles of temperature and precipitation.
    Humid tropical domainAn ecoregion located in the low latitudes and with a climate controlled by tropical and equatorial air masses. This domain has no winter season and experiences heavy average annual rainfall.
    Polar domainAn ecoregion located at high latitude and with a climate controlled by polar and arctic air masses. This domain has low temperatures, severe winters, and small amounts of precipitation.

    Division
    A subdivision of a domain. A division represents a climate within a domain and is differentiated from other divisions based on precipitation levels and patterns as well as temperature. This is the second level in the hierarchy of ecoregions. (Source: USDA Forest Service)

    ValueDefinition
    (See table below)The values for Division are listed below, along with the domains with which they are associated. Detailed definitions of divisions can be found at <http://www.fs.fed.us/colorimagemap/ecoreg1_divisions.html>.
    
    Domain                   Divisions
    -------------------------------------------------------------------
    Dry Domain               Temperate Desert Division
                             Temperate Desert Regime Mountains
                             Temperate Steppe Division
                             Temperate Steppe Regime Mountains
                             Tropical/Subtropical Desert Division
                             Tropical/Subtropical Regime Mountains
                             Tropical/Subtropical Steppe Division
    
    Humid temperate domain   Hot Continental Division
                             Hot Continental Regime Mountains
                             Marine Division
                             Marine Regime Mountains
                             Mediterranean Division
                             Mediterranean Regime Mountains
                             Prairie Division
                             Subtropical Division
                             Subtropical Regime Mountains
                             Warm Continental Division
                             Warm Continental Regime Mountains
    
    Humid tropical domain    Rainforest Regime Mountains
                             Savanna Division
                             Savanna Regime Mountains
    
    Polar domain             Subarctic Division
                             Subarctic Regime Mountains
                             Tundra Division
                             Tundra Regime Mountains
    

    Province
    A subdivision of a division. A province represents variations in vegetation or other natural land covers within a division. Mountainous areas that exhibit different ecological zones based on elevation (elevational zonation) are distinguished according to the character of the zonation by listing the elevational zones from lower to upper. This is the third level in the hierarchy of ecoregions. (Source: National Atlas of the United States)

    ValueDefinition
    (See table below)The values for Province are listed below, along with the divisions with which they are associated. Detailed definitions of provinces can be found at <http://www.fs.fed.us/colorimagemap/ecoreg1_provinces.html>.
    
    Division          Provinces
    -------------------------------------------------------------------
    Hot Continental Division
                      Eastern Broadleaf Forest (Oceanic) Province
                      Eastern Broadleaf Forest (Continental) Province
    
    Hot Continental Regime Mountains
                      Central Appalachian Broadleaf Forest-Coniferous
                        Forest-Meadow Province
                      Ozark Broadleaf Forest - Meadow Province
    
    Marine Division
                      Pacific Lowland Mixed Forest Province
    
    Marine Regime Mountains
                      Cascade Mixed Forest-Coniferous Forest-Alpine
                        Meadow Province
                      Pacific Coastal Mountains Forest-Meadow
                        Province
                      Pacific Gulf Coastal Forest-Meadow Province
    
    Mediterranean Division
                      California Coastal Chaparral Forest and Shrub
                        Province
                      California Coastal Steppe-Mixed Forest-Redwood
                        Forest Province
                      California Dry Steppe Province
    
    Mediterranean Regime Mountains
                      California Coastal Range Open Woodland-Shrub-
                        Coniferous Forest-Meadow Province
                      Sierran Steppe-Mixed Forest-Coniferous Forest-
                        Alpine Meadow Province
    
    Prairie Division
                      Prairie Parkland (Subtropical) Province
                      Prairie Parkland (Temperate) Province
    
    Rainforest Regime Mountains
                      Hawaiian Islands Province
    
    Savanna Division
                      Everglades Province
    
    Savanna Regime Mountains
                      Puerto Rico Province
    
    Subarctic Division
                      Coastal Trough Humid Tayga Province
                      Upper Yukon Tayga Province
                      Yukon Intermontane Plateaus Tayga Province
    
    Subarctic Regime Mountains
                      Alaska Range Humid Tayga-Tundra-Meadow Province
                      Upper Yukon Tayga-Meadow Province
                      Yukon Intermontane Plateaus Tayga-Meadow
                        Province
    
    Subtropical Division
                      Lower Mississippi Riverine Forest Province
                      Outer Coastal Plain Mixed Forest Province
                      Southeastern Mixed Forest Province
    
    Subtropical Regime Mountains
                      Ouachita Mixed Forest - Meadow Province
    
    Temperate Desert Division
                      Intermountain Semi-Desert Province
                      Intermountain Semi-Desert and Desert Province
    
    Temperate Desert Regime Mountains
                      Nevada-Utah Mountains-Semi-Desert-Coniferous
                        Forest-Alpine Meadow Province
    
    Temperate Steppe Division
                      Great Plains-Palouse Dry Steppe Province
                      Great Plains Steppe Province
    
    Temperate Steppe Regime Mountains
                      Black Hills Coniferous Forest Province
                      Middle Rocky Mountain Steppe-Coniferous Forest-
                        Alpine Meadow Province
                      Northern Rocky Mountain Forest-Steppe-Coniferous
                        Forest-Alpine Meadow Province
                      Southern Rocky Mountain Steppe-Open Woodland-
                        Coniferous Forest-Alpine Meadow Province
    
    Tropical/Subtropical Desert Division
                      American Semi-Desert and Desert Province
                      Chihuahuan Semi-Desert Province
    
    Tropical/Subtropical Regime Mountains
                      Arizona-New Mexico Mountains Semi-Desert-Open
                        Woodland-Coniferous Forest-Alpine Meadow
                        Province
    
    Tropical/Subtropical Steppe Division
                      Colorado Plateau Semi-Desert Province
                      Great Plains Steppe and Shrub Province
                      Southwest Plateau and Plains Dry Steppe and Shrub
                        Province
    
    Tundra Division
                      Arctic Tundra Province
                      Bering Tundra (Northern) Province
                      Bering Tundra (Southern) Province
    
    Tundra Regime Mountains
                      Ahklun Mountains Tundra-Meadow Province
                      Aleutian Oceanic Meadow-Heath Province
                      Brooks Range Tundra-Polar Desert Province
                      Seward Peninsula Tundra-Meadow Province
    
    Warm Continental Division
                      Laurentian Mixed Forest Province
    
    Warm Continental Regime Mountains
                      Adirondack-New England Mixed Forest-Coniferous
                        Forest-Alpine Meadow Province
    

    Section
    A subdivision of a province. A section represents different landform groupings within a province. This is the lowest level in the hierarchy of ecoregions and subregions. Narrative descriptions of sections correspond to unique Ecocode values, above. (Source: National Atlas of the United States)

    ValueDefinition
    (See table below)The values for Section are listed below, along with the provinces with which they are associated. Detailed definitions of sections can be found at <http://www.fs.fed.us/land/pubs/ecoregions/>.
    
    Province
    Ecocode     Section
    -------------------------------------------------------------------
    Adirondack-New England Mixed Forest-Coniferous Forest-Alpine Meadow
      Province
    M212A       White Mountains Section
    M212B       New England Piedmont Section
    M212C       Green, Taconic, Berkshire Mountains Section
    M212D       Adirondack Highlands Section
    M212E       Catskill Mountains Section
    
    Ahklun Mountains Tundra-Meadow Province
    M126A       Ahklun Mountains Section
    
    Alaska Range Humid Tayga-Tundra-Meadow Province
    M135A       Alaska Mountains Section
    M135B       Wrangell Mountains Section
    
    Aleutian Oceanic Meadow-Heath Province
    M127A       Alaska Peninsula Section
    M127B       Aleutian Islands Section
    M127C       West Kodiak Island Section
    
    American Semi-Desert and Desert Province
    -322A       Mojave Desert Section
    -322B       Sonoran Desert Section
    -322C       Colorado Desert Section
    
    Arctic Tundra Province
    -124A       Coastal Plain
    
    Arizona-New Mexico Mountains Semi-Desert-Open Woodland-Coniferous
      Forest-Alpine Meadow Province
    M313A       White Mountain-San Francisco Peaks-Mogollon Rim Section
    M313B       Sacramento-Monzano Mountain Section
    
    Bering Tundra (Northern) Province
    -125A       Kotzebue Sound Lowlands Section
    -125B       Yukon-Kuskokwim Delta Section
    
    Bering Tundra (Southern) Province
    -126A       Bristol Bay Lowlands Section
    
    Black Hills Coniferous Forest Province
    M334A       Black Hills Section
    
    Brooks Range Tundra-Polar Desert Province
    M121A       Foothills Section
    M121B       Mountains Section
    
    California Coastal Chaparral Forest and Shrub Province
    -261A       Central California Coast Section
    -261B       Southern California Coast Section
    
    California Coastal Range Open Woodland-Shrub-Coniferous Forest-
      Meadow Province
    M262A       Central California Coast Ranges Section
    M262B       Southern California Mountains and Valleys Section
    
    California Coastal Steppe-Mixed Forest-Redwood Forest Province
    -263A       Northern California Coast Section
    
    California Dry Steppe Province
    -262A       Great Valley Section
    
    Cascade Mixed Forest-Coniferous Forest-Alpine Meadow Province
    M242A       Oregon and Washington Coast Ranges Section
    M242B       Western Cascades Section
    M242C       Eastern Cascades Section
    
    Central Appalachian Broadleaf Forest-Coniferous Forest-Meadow
      Province
    M221A       Northern Ridge and Valley Section
    M221B       Allegheny Mountains Section
    M221C       Northern Cumberland Mountains Section
    M221D       Blue Ridge Mountains Section
    
    Chihuahuan Semi-Desert Province
    -321A       Basin and Range Section
    -321B       Stockton Plateau Section
    
    Coastal Trough Humid Tayga Province
    -135A       Cook Inlet Lowlands Section
    -135B       Copper River Basin Section
    
    Colorado Plateau Semi-Desert Province
    -313A       Grand Canyon Section
    -313B       Navajo Canyonlands Section
    -313C       Tonto Transition Section
    -313D       Painted Desert Section
    -313E       Central Rio Grande Intermontane Section
    
    Eastern Broadleaf Forest (Continental) Province
    -222A       Ozark Highlands Section
    -222C       Upper Gulf Coastal Plain Section
    -222D       Interior Low Plateau, Shawnee Hills Section
    -222E       Interior Low Plateau, Highland Rim Section
    -222F       Interior Low Plateau, Bluegrass Section
    -222G       Central Till Plains, Oak-Hickory Section
    -222H       Central Till Plains, Beech-Maple Section
    -222I       Erie and Ontario Lake Plain Section
    -222J       South Central Great Lakes Section
    -222K       Southwestern Great Lakes Morainal Section
    -222L       North-Central U.S. Driftless and Escarpment Section
    -222M       Minnesota and Northeastern Iowa, Morainal, Oak Savanna
                  Section
    -222N       Lake Agassiz, Aspen Parklands Section
    
    Eastern Broadleaf Forest (Oceanic) Province
    -221A       Lower New England Section
    -221B       Hudson Valley Section
    -221C       Upper Atlantic Coastal Plain Section
    -221D       Northern Appalachian Piedmont Section
    -221E       Southern Unglaciated Allegheny Plateau Section
    -221F       Western Glaciated Allegheny Plateau Section
    -221H       Northern Cumberland Plateau Section
    -221I       Southern Cumberland Mountains Section
    -221J       Central Ridge and Valley Section
    
    Everglades Province
    -411A       Everglades Section
    
    Great Plains Steppe Province
    -332A       Northeastern Glaciated Plains Section
    -332B       Western Glaciated Plains Section
    -332C       Nebraska Sand Hills Section
    -332D       North-Central Great Plains Section
    -332E       South-Central Great Plains Section
    
    Great Plains Steppe and Shrub Province
    -311A       Redbed Plains Section
    
    Great Plains-Palouse Dry Steppe Province
    -331A       Palouse Prairie Section
    -331B       Southern High Plains Section
    -331C       Central High Tablelands Section
    -331D       Northwestern Glaciated Plains Section
    -331E       Northern Glaciated Plains Section
    -331F       Northwestern Great Plains Section
    -331G       Powder River Basin Section
    -331H       Central High Plains Section
    -331I       Arkansas Tablelands Section
    -331J       Northern Rio Grande Basin Section
    
    Hawaiian Islands Province
    M423A       Hawaiian Islands Section
    
    Intermountain Semi-Desert Province
    -342A       Bighorn Basin Section
    -342B       Northwestern Basin and Range Section
    -342C       Owyhee Uplands Section
    -342D       Snake River Basalts Section
    -342E       Bear Lake Section
    -342F       Central Basin and Hills Section
    -342G       Green River Basin Section
    -342H       High Lava Plains Section
    -342I       Columbia Basin Section
    
    Intermountain Semi-Desert and Desert Province
    -341A       Bonneville Basin Section
    -341B       Northern Canyon Lands Section
    -341C       Uinta Basin Section
    -341D       Mono Section
    -341E       Lahontan Basin Section
    -341F       Southeastern Great Basin Section
    -341G       Northeastern Great Basin Section
    
    Laurentian Mixed Forest Province
    -212A       Aroostook Hills and Lowlands Section
    -212B       Maine and New Brunswick Foothills and Eastern Lowlands
                  Section
    -212C       Fundy Coastal and Interior Section
    -212D       Central Maine Coastal and Interior Section
    -212E       St. Lawrence and Champlain Valley Section
    -212F       Northern Glaciated Allegheny Plateau Section
    -212G       Northern Unglaciated Allegheny Plateau Section
    -212H       Northern Great Lakes Section
    -212J       Southern Superior Uplands Section
    -212K       Western Superior Section
    -212L       Northern Superior Uplands Section
    -212M       Northern Minnesota and Ontario Section
    -212N       Northern Minnesota Draft and Lake Plains Section
    
    Lower Mississippi Riverine Forest Province
    -234A       Mississippi Alluvial Basin Section
    
    Middle Rocky Mountain Steppe-Coniferous Forest-Alpine Meadow
      Province
    M332A       Idaho Batholith Section
    M332B       Bitterroot Valley Section
    M332C       Rocky Mountain Front Section
    M332D       Belt Mountains Section
    M332E       Beaverhead Mountains Section
    M332F       Challis Volcanics Section
    M332G       Blue Mountains Section
    
    Nevada-Utah Mountains-Semi-Desert-Coniferous Forest-Alpine Meadow
      Province
    M341A       Central Great Basin Mountains Section
    M341B       Tavaputs Plateau Section
    M341C       Utah High Plateaus and Mountains Section
    
    Northern Rocky Mountain Forest-Steppe-Coniferous Forest-Alpine
      Meadow Province
    M333A       Okanogan Highlands Section
    M333B       Flathead Valley Section
    M333C       Northern Rockies Section
    M333D       Bitterroot Mountains Section
    
    Ouachita Mixed Forest - Meadow Province
    M231A       Ouachita Mountains Section
    
    Outer Coastal Plain Mixed Forest Province
    -232A       Middle Atlantic Coastal Plain Section
    -232B       Coastal Plains and Flatwoods, Lower Section
    -232C       Atlantic Coastal Flatlands Section
    -232D       Florida Coastal Lowlands (Western) Section
    -232E       Louisiana Coast Prairies and Marshes Section
    -232F       Coastal Plains and Flatwoods, Western Gulf Section
    -232G       Florida Coastal Lowlands (Eastern) Section
    
    Ozark Broadleaf Forest - Meadow Province
    M222A       Boston Mountains Section
    
    Pacific Coastal Mountains Forest-Meadow Province
    M244A       Chugach-St. Elias Mountains Section
    M244B       Lynn Canal Section
    M244C       Boundary Range Section
    
    Pacific Gulf Coastal Forest-Meadow Province
    M245A       Northern Gulf Section
    M245B       Northern Alexander Archipelago Section
    M245C       Southern Alexander Archipelago Section
    
    Pacific Lowland Mixed Forest Province
    -242A       Willamette Valley and Puget Trough Section
    
    Prairie Parkland (Subtropical) Province
    -255A       Cross Timbers and Prairie Section
    -255B       Blackland Prairies Section
    -255C       Oak Woods and Prairies Section
    -255D       Central Gulf Prairies and Marshes Section
    
    Prairie Parkland (Temperate) Province
    -251A       Red River Valley Section
    -251B       North-Central Glaciated Plains Section
    -251C       Central Dissected Till Plains Section
    -251D       Central Till Plains Section
    -251E       Osage Plains Section
    -251F       Flint Hills Section
    -251G       Central Loess Plains Section
    
    Puerto Rico Province
    M411A       Dry-Humid Mountains Section
    
    Seward Peninsula Tundra-Meadow Province
    M125A       Seward Mountains Section
    
    Sierran Steppe-Mixed Forest-Coniferous Forest-Alpine Meadow
      Province
    M261A       Klamath Mountains Section
    M261B       Northern California Coast Ranges Section
    M261C       Northern California Interior Coast Ranges Section
    M261D       Southern Cascades Section
    M261E       Sierra Nevada Section
    M261F       Sierra Nevada Foothills Section
    M261G       Modoc Plateau Section
    
    Southeastern Mixed Forest Province
    -231A       Southern Appalachian Piedmont Section
    -231B       Coastal Plains, Middle Section
    -231C       Southern Cumberland Plateau Section
    -231D       Southern Ridge and Valley Section
    -231E       Mid Coastal Plains, Western Section
    -231F       Eastern Gulf Prairies and Marshes Section
    -231G       Arkansas Valley Section
    
    Southern Rocky Mountain Steppe-Open Woodland-Coniferous Forest-
      Alpine Meadow Province
    M331A       Yellowstone Highlands Section
    M331B       Bighorn Mountains Section
    M331D       Overthrust Mountains Section
    M331E       Uinta Mountains Section
    M331F       Southern Parks and Rocky Mountain Ranges Section
    M331G       South-Central Highlands Section
    M331H       North-Central Highlands and Rocky Mountain Section
    M331I       Northern Parks and Ranges Section
    M331J       Wind River Mountain Section
    
    Southwest Plateau and Plains Dry Steppe and Shrub Province
    -315A       Pecos Valley Section
    -315B       Texas High Plains Section
    -315C       Rolling Plains Section
    -315D       Edwards Plateau Section
    -315E       Rio Grande Plain Section
    -315F       Southern Gulf Prairies and Marshes Section
    
    Upper Yukon Tayga Province
    -139A        Upper Yukon Flats Section
    
    Upper Yukon Tayga-Meadow Province
    M139A        Upper Yukon Highlands Section
    
    Yukon Intermontane Plateaus Tayga Province
    -131A        Upper Kobuk Valley Section
    -131B        Yukon-Kuskokwim Bottomlands Section
    
    Yukon Intermontane Plateaus Tayga-Meadow Province
    M131A        Nulato Hills Section
    M131B        Kuskokwim Mountains Section
    M131C        Nushagak-Lime Hills Section
    

    Mcode
    A code used to identify mountainous ecoregions with variations due to elevation. (Source: USDA Forest Service)

    ValueDefinition
    -The ecoregion is not mountainous.
    MThe ecoregion is mountainous.

    Pcode
    A numeric code identifying the Province. (Source: National Atlas of the United States)

    Range of values
    Minimum:121
    Maximum:423

    Scode
    A code identifying the section within the Province. This is the last character of Ecocode. This field is designed for cartographic production. (Source: USDA Forest Service)

    Range of values
    Minimum:A
    Maximum:N

    Key
    The first three characters of the Section value. (Source: USDA Forest Service)

    Range of values
    Minimum:Adi
    Maximum:Yuk

    Fdigit
    The last four digits of Ecocode. This is a cartographic production field for labeling Sections. (Source: USDA Forest Service)

    Range of values
    Minimum:121A
    Maximum:423A

    Mtext
    The first four digits of Ecocode. This code identifies mountainous and non-mountainous Provinces. (Source: USDA Forest Service)

    Range of values
    Minimum:-124
    Maximum:M423


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

    • USDA Forest Service

  2. Who also contributed to the data set?

  3. To whom should users address questions about the data?

    Robert G. Bailey
    USDA Forest Service Inventory and Monitoring Institute
    2150 Centre Ave, Bldg A
    Fort Collins, CO 80526
    USA

    970-295-5727 (voice)
    970-295-5885 (FAX)
    rgbailey@fs.fed.us


Why was the data set created?

These data are intended for geographic display and analysis at the national level, and for large regional areas. The data should be displayed and analyzed at scales appropriate for 1:7,500,000-scale data. No responsibility is assumed by the National Atlas of the United States in the use of these data.


How was the data set created?

  1. From what previous works were the data drawn?

    FS Lower48 Ecoregions (source 1 of 5)
    Bailey, R.G., McNab, W.H., Avers, P.E., and King, T., 1994, Ecoregions and Subregions of the United States (Lower 48): USDA Forest Service, Washington, DC.

    Type_of_Source_Media: Online
    Source_Scale_Denominator: 7500000
    Source_Contribution: Spatial and attribute information

    FS Alaska Ecoregions (source 2 of 5)
    Bailey, R.G., McNab, W.H., Avers, P.E., and King, T., 1994, Ecoregions and Subregions of Alaska: USDA Forest Service, Washington, DC.

    Type_of_Source_Media: Online
    Source_Scale_Denominator: 7500000
    Source_Contribution: Spatial and attribute information

    FS Hawaii Ecoregions (source 3 of 5)
    Bailey, R.G., McNab, W.H., Avers, P.E., and King, T., 1994, Ecoregions and Subregions of Hawaii: USDA Forest Service, Washington, VA.

    Type_of_Source_Media: Online
    Source_Scale_Denominator: 7500000
    Source_Contribution: Attribute information

    FS PR_VI Ecoregions (source 4 of 5)
    Bailey, R.G., McNab, W.H., Avers, P.E., and King, T., 1994, Ecoregions and Subregions of Puerto Rico and the Virgin Islands: USDA Forest Service, Washington, DC.

    Type_of_Source_Media: Online
    Source_Scale_Denominator: 7500000
    Source_Contribution: Attribute information

    Atlas-States (source 5 of 5)
    National Atlas of the United States, 200206, State Boundaries of the United States: National Atlas of the United States, Reston, VA.

    Online Links:

    Type_of_Source_Media: Online
    Source_Scale_Denominator: 2000000
    Source_Contribution: Spatial information

  2. How were the data generated, processed, and modified?

    Date: Jan-2004 (process 1 of 1)
    The USDA Forest Service ecoregions shapefile for the 48 conterminous States and the export file for Alaska were downloaded and reprojected to a Lambert Azimuthal Equal Area projection using ArcInfo. The shorelines were removed and replaced with shorelines from the National Atlas States map layer. Linework was cleaned and adjusted. USDS Forest Service ecoregions attribution for Hawaii, Puerto Rico, and the U.S. Virgin Islands was added to the polygons for those areas defined by the National Atlas shorelines.

    The polygon attribution was checked and the following corrections were made: For Ecocode = -263A the Province field was blank; this was corrected to California Coastal Steppe-Mixed Forest-Redwood Forest Province. For Ecocode = M242A, Ecocode = M242B, and Ecocode = M242C the Division was corrected from Marine Regime Mountains Redwood Forest Province to Marine Regime Mountains.

    Data sources used in this process:

    • FS Lower48 Ecoregions
    • FS Alaska Ecoregions
    • FS Hawaii Ecoregions
    • FS PR_VI Ecoregions
    • Atlas-States

  3. What similar or related data should the user be aware of?

    Bailey, Robert G. , 1995, Description of the Ecoregions of the United States: Miscellaneous Publication 1391, USDA Forest Service, Washington, DC.

    Online Links:

    Other_Citation_Details: 108 pages with separate map at 1:7,500,000
    Service, USDA Forest , 200506, Omernik’s Level III Ecoregions of the Continental United States: National Atlas of the United States, Reston, VA.

    Online Links:


How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

  2. How accurate are the geographic locations?

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    This map layer includes ecoregions and subregions information for the United States, the District of Columbia, Puerto Rico, and the U.S. Virgin Islands.

  5. How consistent are the relationships among the observations, including topology?

    No checks for topological consistency were performed on this map layer.


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None
Use_Constraints:
None. Acknowledgment of the USDA Forest Service and (or) the National Atlas of the United States of America would be appreciated in products derived from these data.

  1. Who distributes the data set? (Distributor 1 of 1)

    Earth Science Information Center, U.S. Geological Survey
    507 National Center
    Reston, VA 20192

    1-888-ASK-USGS (1-888-275-8747) (voice)

    Contact_Instructions:
    In addition to the address above there are other ESIC offices throughout the country. A full list of these offices is at <http://ask.usgs.gov/esic_index.html>.

  2. What's the catalog number I need to order this data set?

  3. What legal disclaimers am I supposed to read?

    Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made by the U.S. Geological Survey regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. No responsibility is assumed by the U.S. Geological Survey in the use of these data.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 17-Apr-2006
Metadata author:
Peg Rawson
National Atlas of the United States
12201 Sunrise Valley Drive
Reston, VA 20192

703-648-4183 (voice)
atlasmail@usgs.gov

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)



 


Generated by mp version 2.8.16 on Mon May 15 13:26:29 2006