U.S. Geological Survey
U.S. Geological Survey
Ecoregions of Alaska Map
Originator: Gallant, A.L.
Publication_Date: 1996
Title: Ecoregions of Alaska
Type_of_Map: map
Publication_Information:
Publication_Place:
Publisher: USGS
USGS Ecoregions of Alaska Map
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 map and descriptions
of 20 ecological regions were derived by synthesizing information
on the geographic distribution of environmental factors such as climate,
terrain (including information on physiography, geology, glaciation,
permafrost, and hydrologic features), soils, and vegetation. A qualitative
assessment was used to interpret the distributional patterns and relative
importance of these factors for influencing the character of the landscape
from place to place.
A map of ecoregions of Alaska has been produced as a framework for organizing and interpreting environmental data for State, national, and international inventory, monitoring, and research efforts.
The coverage was installed from an ARC/INFO file supplied
by A.L. Gallant, Colorado State University.
The ecoregions were plotted on a terminal to ensure the file
was imported properly.
Gallant, A.L., Binnian, E.F., Omernik, J.M., and Shasby, M.B 1996. Ecoregions of Alaska: U.S. Geological Survey Professional Paper 1567, 73 p. 1 plate [map folded in pocket], scale 1:5,000,000.
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1996
Currentness_Reference: publication date
Progress: Complete
Maintenance_and_Update_Frequency:
Bounding_Coordinates:
West_Bounding_Coordinate: 170.0000
East_Bounding_Coordinate: -130.0000
North_Bounding_Coordinate: 51.0000
South_Bounding_Coordinate: 71.0000
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Ecoregion
Alaska
Arctic Coastal Plain
Arctic Foothills
Brooks Range
Interior Forested Lowlands and Uplands
Interior Highlands
Interior Bottomlands
Yukon Flats
Ogilvie Mountains
Subarctic Coastal Plains
Seward Peninsula
Ahklun and Kilbuck Mountains
Bristol Bay-Nushagak Lowlands
Alaska Peninsula Mountains
Aleutian Islands
Cook Inlet
Alaska Range
Copper Plateau
Wrangell Mountains
Pacific Coastal Mountains
Coastal Western Hemlock-Sitka Spruce Forests
None
None
Security_Classification: UNCLASSIFIED
Arc/INFO
Polygon topology present.
(See Supplemental_Information )
Horizontal_Positional_Accuracy: See Supplemental_Information ) Vertical_Positional_Accuracy: See Supplemental_Information )
See Supplemental_Information for overview.
Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 1573
SDTS_Point_and_Vector_Object_Type: String
Point_and_Vector_Object_Count: 3320
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 1574
Planar:
Map_Projection:
Map_Projection_Name: Albers Conical Equal Area
Alber_Conical_Equal_Area:
Standard_Parallel: 55.0
Standard_Parallel: 65.0
Longitude_of_Central_Meridian: -154.0
Latitude_of_Projection_Origin: 50.0
False_Easting: 0.0
False_Northing: 0.0
Entity_Type:
Entity_Type_label: ECOREG.PAT
Entity_Type_Definition: Polygon attribute table
Number_of_Attributes_in_Entity: 6
Attribute:
Attribute_Label: AREA
Attribute_Definition: Area of polygon in square coverage units
Attribute_Definition_Source: Computed
Attribute_Domain_Values: Positive real numbers
Attribute:
Attribute_Label: PERIMETER
Attribute_Definition: Perimeter of polygon in coverage units
Attribute_Definition_Source: Computed
Attribute_Domain_Values: Positive real numbers
Attribute:
Attribute_Label: ECOREG#
Attribute_Definition: Internal feature number
Attribute_Definition_Source: Computed
Attribute_Domain_Values: Sequential unique positive integer
Attribute:
Attribute_Label: ECOREG-ID
Attribute_Definition: User-assigned feature number
Attribute_Definition_Source: User-defined
Attribute_Domain_Values: Integer
Attribute:
Attribute_Label: REGION
Attribute_Definition: Full ecoregion code
Attribute_Definition_Source: Gallant (1996)
Attribute_Domain_Values: 101-120, 0=none
Attribute:
Attribute_Label: TRANSITION
Attribute_Definition: Transition area
Attribute_Definition_Source: Gallant (1996)
Attribute_Domain_Values: 1=Transitional zone
Entity_Type:
Entity_Type_label: ECOREG.AAT
Entity_Type_Definition: Polygon attribute table
Number_of_Attributes_in_Entity: 8
Attribute:
Attribute_Label: FNODE#
Attribute_Definition: Internal number of from-node
Attribute_Definition_Source: Computed
Attribute_Domain_Values: Sequential unique positive numbers
Attribute:
Attribute_Label: TNODE#
Attribute_Definition: Internal number of to-node
Attribute_Definition_Source: Computed
Attribute_Domain_Values: Sequential unique positive numbers
Attribute:
Attribute_Label: LPOLY#
Attribute_Definition: Internal number of poly to left of arc
Attribute_Definition_Source: Computed
Attribute_Domain_Values: Sequential unique positive numbers
Attribute:
Attribute_Label: RPOLY#
Attribute_Definition: Internal number of poly to right of arc
Attribute_Definition_Source: Computed
Attribute_Domain_Values: Sequential unique positive numbers
Attribute:
Attribute_Label: LENGTH
Attribute_Definition: Length of arc in coverage units
Attribute_Definition_Source: Computed
Attribute_Domain_Values: Positive real numbers
Attribute:
Attribute_Label: ECOREG#
Attribute_Definition: Internal feature number
Attribute_Definition_Source: Computed
Attribute_Domain_Values: Sequential unique positive integer
Attribute:
Attribute_Label: ECOREG-ID
Attribute_Definition: User-assigned feature number
Attribute_Definition_Source: User-defined
Attribute_Domain_Values: Integer
Attribute:
Attribute_Label: LINETYPE
Attribute_Definition: Type of Line Feature
Attribute_Definition_Source: User-defined
Attribute_Domain_Values: 1,5,9
COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED?
1 AREA 8 18 F 5 -
9 PERIMETER 8 18 F 5 -
17 ECOREG# 4 5 B - -
21 ECOREG-ID 4 5 B - -
25 REGION 5 5 I - -
30 TRANSITION 3 3 I - -
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. There are 20 ecoregions, identified by
the item REGION.
101. Arctic Coastal Plain
102. Arctic Foothills
103. Brooks Range
104. Interior Forested Lowlands and Uplands
105. Interior Highlands
106. Interior Bottomlands
107. Yukon Flats
108. Ogilvie Mountains
109. Subarctic Coastal Plains
110. Seward Peninsula
111. Ahklun and Kilbuck Mountains
112. Bristol Bay-Nushagak Lowlands
113. Alaska Peninsula Mountains
114. Aleutian Islands
115. Cook Inlet
116. Alaska Range
117. Copper Plateau
118. Wrangell Mountains
119. Pacific Coastal Mountains
120. Coastal Western Hemlock-Sitka Spruce Forests
Transitional areas along ecoregion boundaries are areas sharing
characteristics of two or more adjacent ecoregions. Due to the map scale
and resolution, as well as to the resolution of the information used to
derive the map, not all transition zones can be represented.
TRANSITION
1 transitional area
2 not transitional area
COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME INDEXED?
1 FNODE# 4 5 B - -
5 TNODE# 4 5 B - -
9 LPOLY# 4 5 B - -
13 RPOLY# 4 5 B - -
17 LENGTH 8 18 F 5 -
25 ECOREG# 4 5 B - -
29 ECOREG-ID 4 5 B - -
33 LINETYPE 3 3 I - -
Transitional areas along ecoregion boundaries are areas sharing
characteristics of two or more adjacent ecoregions. Due to the map scale
and resolution, as well as to the resolution of the information used to
derive the map, not all transition zones can be represented.
LINETYPE
1 Transitional area boundary (this is symbolized as an opaque line)
5 Ecoregion boundary
9 Coastline or political boundary
Entity_and_Attribute_Detail_Citation: See Entity_and_Attribute_Information )
Distributor_Contact_Organization: U.S. Geological Survey
Distributor_Contact_Address: (Please use electronic mail.)
Distributor_Contact_Voice_Telephone: Please use electronic mail.
Distributor_Contact_Electronic_Mail_Address: webmaster@www-eros-afo.wr.usgs.gov
Resource_Description: ECOREGION
Distribution_Liability: Although these data have been processed
successfully on a computer system at the U.S. Geological Survey,
U.S. Department of the Interior, no warranty expressed or implied
is made by the Geological Survey regarding the utility of the data
on any other system, nor shall the act of distribution constitute
any such warranty.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ARCE
Files are compressed with the GNU-zip public-domain file
compression utility.
Digital_Transfer_Option:
ECOREGION is available via Internet!
Select the "Load to Local Disk" option on your client software
and click this format::
Arc/INFO Export
Fees: None.
Available_Time_Period: Immediate.
Metadata_Date: 19961219 Metadata_Contact: jnbarry Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: 19940608 Metadata_Time_Convention: Local Time