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NPR-A Earth Cover Classification

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Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Bureau of Land Management
Publication_Date: 19981020
Title: NPR-A Earth Cover Classification
Edition: 1
Geospatial_Data_Presentation_Form: remote-sensing image
Publication_Information:
Publication_Place: Anchorage AK
Publisher: Bureau of Land Management
Online_Linkage: <https://agdc.usgs.gov>
Description:
Abstract:
The objective of this project was to create an updated and detailed earth cover inventory in computer database format for the entire NPR-A. The purpose of the project was to develop a tool for aiding in the management of the NPR-A and for developing baseline information that could be used in other studies. Due to the immense size of the project area, limited field access, and lack of aircraft support infrastructure, the NPR-A project was divided into three phases. These phases were completed in 1995, 1996, and 1998, respectively. Eight Landsat TM satellite scenes and three SPOT XS satellite scenes, were used to classify the NPR-A into earth cover categories. An unsupervised clustering or seeding technique was used to determine the location of field sites and a custom field data collection card was used to record field information. After initial on-the-ground sampling, a helicopter was utilized to gain access to field sites throughout the project area. Global positioning system (GPS) technology was used both to navigate to pre-selected sites and record locations of new sites selected in the field. Data were collected on 1,667 field sites during a three year field season from 1994 through 1996. A portion (44%) of these field sites were set aside for accuracy assessment. A combined supervised/unsupervised classification technique was performed to classify the satellite imagery into seven major classes and seventeen minor classes. The classification scheme for the land cover inventory was developed through a series of meetings with biologists familiar with the vegetation and previous work (Markon and Derkson 1994). As each scene was completed it was mosaicked and edge matched with adjacent scenes to produce a seamless database of NPR-A earth cover types.
Purpose:
The data base provides researchers and managers a central area to obtain this information and is continuously being updated as new data become available. Access to the data may be found at <https://agdc.usgs.gov>.
Supplemental_Information:
Class Description 0 Background 1 Clear water 2 Turbid water 3 Ice 4 Carex aquatilis 5 Arctophyla fulva 6 Flooded tundra - low center polygons 7 Flooded tundra - non-patterned 8 Wet tundra 9 Sedge/Grass Meadow 10 Tussock tundra 11 Moss/Lichen 12 Dwarf shrub 13 Low shrub 14 Tall shrub 15 Dunes/Dry sand 16 Sparsely vegetated 17 Barren ground - other 18 Clouds - shadows - bad pixels 19 Dryas 20 Mountain shadow

Projection Information: Name of Projection: UTM Zone 4 Name of Spheroid: Clarke 1866 Name of Datum: NAD 27 Map Unit: Meters Upper Left X 249481.0 Upper Left Y 8011939.0

Data Dictionary: 1.0 Water5.0 Moist Tundra 1.1 Clear5.1 Sedge/Grass Meadow 1.2 Turbid5.2 Tussock Tundra 1.3 Ice5.3 Moss/Peat/Lichen 2.0 Aquatic6.0 Shrub 2.1 Carex aquatilis6.1 Dwarf 2.2 Arctophila fulva6.2 Low 6.3 Tall 3.0 Flooded Tundra 3.1 Low-centered Polygons7.0 Barren Ground 3.2 Non-patterned7.1 Dunes/Dry Sand 7.2 Sparsely Vegetated 4.0 Wet Tundra7.3 Other 1.1 Clear Water - Fresh or saline waters with little or no particulate matter. Clear water areas are typically deep (greater than one meter). The clear water class may contain small amounts of Arctophila fulva or Carex aquatilis but generally less than 15% surface coverage of these species. 1.2 Turbid Water - Waters that contain particulate matter or shallow (<1m), clear water bodies that are spectrally different from class 1.1. This class typically occurs in shallow lake shelves, deltaic plumes, and rivers and lakes with high sediment loads. The turbid water class may contain small amounts of Arctophila fulva or Carex aquatilis but generally less than 15% surface coverage of these species. 1.3 Ice - May last into late summer on lakes and larger ponds. Ice is present year round in many of the larger lakes. 2.1 Carex aquatilis - Associated with lake or pond shorelines and composed of 50 - 80% clear or turbid water that was greater than 10 centimeters deep. The dominant species was Carex aquatilis. A small percentage of Arctophila fulva, Hippuris vulgaris, Potentilla palustris, and Caltha palustris may be present. 2.2 Arctophila fulva - Associated with lake or pond shorelines and composed of 50 - 80% clear or turbid water that was greater then 10 centimeters deep. The dominant species was Arctophila fulva. A small percentage of Carex aquatilis, Hippuris vulgaris, Potentilla palustris, and Caltha palustris may also be present. 3.1 Flooded Tundra-Low Centered Polygons - Polygon features that retain water throughout the summer. This class is composed of 25 - 50% water; Carex aquatilis is the dominant species in the permanently flooded areas. The dryer ridges of the polygons are composed mostly of Eriophorum russeolum, Eriophorum vaginatum, Sphagnum spp., Salix spp., Betula nana, Arctostaphylos spp., and Ledum palustre. 3.2 Flooded Tundra-Non-pattern - Continuously flooded areas composed of 25-50% water. Carex aquatilis was the dominant species. Other species may include Hippuris vulgaris, Potentilla palustris, and Caltha palustris. Non-pattern is distinguished from low centered polygons by the lack of polygon features and associated shrub species that grow on the dry ridges of low centered polygons. 4.0 Wet Tundra - Associated with areas of super saturated soils and standing water. Wet tundra often floods in early summer and generally drains of excess water during dry periods but remains saturated throughout the summer. It is composed of 10-25% water; Carex aquatilis is the dominant species. Other species may include Eriophorum angustifolium, and other sedges, grasses, and forbs. 5.1 Sedge/Grass Meadow - Dominated by the sedge family. This class commonly consists of a continuous mat of sedges and grasses with a moss and lichen understory. The dominant species were Carex aquatilis, Eriophorum angustifolium, Eriophorum russeolum, Arctagrostis latifolia and Poa arctica. Associated genera include Cassiope spp., Ledum spp., and Vaccinium spp.. 5.2 Tussock Tundra - Dominated by the tussock-forming sedge Eriophorum vaginatum. Tussock tundra is common throughout the Arctic Foothills and may be found on well-drained sites in all areas of the NPR-A. Cottongrass tussocks are the dominant landscape elements, while moss is the common understory. Lichen, forbs, and shrubs are also present in varying densities. Associated genera include Salix spp., Betula nana, Ledum palustre, and Carex spp.. 5.3 Moss/Lichen - Associated with low lying lakeshores and dry sandy ridges dominated by moss and lichen species. As this type grades into a sedge type, graminoids such as Carex aquatilis may increase in cover, forming an intermediate zone. 6.1 Dwarf Shrub - Associated with ridges and well drained soils and dominated by shrubs less than 30 centimeters in height. Because of the relative dryness of the sites on which this cover type occurs, it is the most species diverse. Major species included Salix spp., Betula nana, Ledum palustre, Dryas spp., Vaccinium spp., Arctostaphylos spp., Eriophorum vaginatum, and Carex aquatilis. This class frequently occurs over a substrate of tussocks. 6.2 Low Shrub - Associated with small streams and rivers, but also occurring on hillsides in the southern portion of the NPR-A. This class is dominated by shrubs between 30 centimeters and 1.5 meters in height. Major species included Salix spp., Betula nana, Alnus crispa, and Ledum palustre. 6.3 Tall Shrub - Found along the Colville River and some of its major tributaries, and dominated by Salix spp. over 1.5 meters in height. This class may also contain significant presence of Alnus crispa over 1.5 meters in height. 7.1 Dunes/Dry Sand - Associated with streams, rivers, lakes and coastal beaches. Dominated by dry sand with less than 10% vegetation. Plant species may include Poa spp., Salix spp., Astragulus spp., Carex spp., Stellaria spp., Arctostaphylos spp., and Puccinellia phryganodes. 7.2 Sparsely Vegetated - Occurred primarily along the coast in areas affected by high or storm tides, in recently drained lake or pond basins, and where there is bare mineral soil that is being re-colonized with vegetation. Dominated by non-vegetated material with 10-30% vegetation. The vegetation in these areas may include rare plants but some of the more commonly found species included Stellaria spp., Poa spp., Salix spp., Astragulus spp., Carex spp., Stellaria spp., Arctostaphylos spp., and Puccinellia phryganodes. 7.3 Barren Ground/Other - Associated with river and stream gravel bars, mountainous areas and urban areas. Includes less than 10% vegetation. May incorporate dead vegetation associated with salt burn from ocean water. Classification Decision Rules: 1.0 WATER ( > 80% water) 1.1 Clear Water - (depth > 1 meter) 1.2 Turbid Water - (depth <1 meter) 1.3 Ice - (ice > 60%) 2.0 AQUATIC (>50% water and <80% water and > 10cm in depth) 2.1 Carex aquatilis - (> 15% Carex aquatilis and < 15% Arctophila fulva) 2.2 Arctophila fulva - (>15% Arctophila fulva and < 15% Carex aquatilis) 3.0 FLOODED TUNDRA ( >25% water and <50% water and < 10cm in depth) 3.1 Low Centered Polygons ( > 5% Sedge/Grass) 3.2 Non -pattern ( < 5% sedge/Grass) 4.0 WET TUNDRA ( > 10% and < 25% water) 5.0 MOIST TUNDRA ( <10% water, < 40% shrub, composed mostly of sedges, grasses, rushes and moss/peat/lichen complex) 5.1 Sedge/Grass Meadow - ( > 50% sedge/grass and <40% tussock cotton grass) 5.2 Tussock Tundra - ( > 40% tussock cotton grass) 5.3 Moss/lichen - ( > 50% moss and/or lichen) 6.0 SHRUB (< 5% water and >40% shrub) 6.1 Dwarf - ( < 30cm in height) 6.2 Low - ( > 30cm and < 1.5 m in height) 6.3 Tall (> 1.5 m in height) 7.0 BARREN GROUND (0-30% vegetated) 7.1 Dunes/dry sand - ( <10% vegetation and > 50% dry sand) 7.2 Sparsely Vegetated - (10-30% vegetated) 7.3 Other - (< 10% vegetation and < 50% dry sand) Accuracy Assessment: The Overall accuracy for the NPR-A was 85% for the seven major classes and 75% for the seventeen minor classes.

Contact Information: Contact Agency: Bureau of Land Management Contact Personnel: John Payne Contact Address 222 West 7th Avenue Alaska State Office Anchorage, AK 99513 Contact Phone: (907) 271-3431

Ducks Unlimited, 1998a. National Petroleum Reserve - Alaska Earth Cover Classification, Final Report, USDI, Bureau of Land Management, Anchorage, AK.

***** Spatial Reference Information (Beg) *****

Projection Parameters

Spatial Information Raster: Number of Columns: 22374 Number of Rows: 18335 Pixel Resolution (m): 30 Data Type: byte

***** Spatial Reference Information (End) *****

Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19980401
Ending_Date: 19981020
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: 0
East_Bounding_Coordinate: 0
North_Bounding_Coordinate: 0
South_Bounding_Coordinate: 0
Keywords:
Theme:
Theme_Keyword_Thesaurus: EARTH SCIENCE > LAND SURFACE> Land Use/Land Cover
Theme_Keyword: Land Use/Land Cover
Place:
Place_Keyword_Thesaurus: U.S.A. > Alaska
Place_Keyword: National Petroleum Reserve - Alaska
Temporal:
Temporal_Keyword_Thesaurus: Dept. of Interior/BLM
Temporal_Keyword: 1998
Access_Constraints: None Known
Use_Constraints: Full acknowledgement given to Bureau of Land Managemet
Browse_Graphic:
Browse_Graphic_File_Name: None
Browse_Graphic_File_Description: None
Browse_Graphic_File_Type: None

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster

Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Data Base Administrator
Contact_Organization: U.S.G.S EROS Alaska Field Office
Contact_Address:
Address_Type: Mailing and Physical Address
Address: 4230 University Dr.
City: Anchorage
State_or_Province: AK
Postal_Code: 99508-4664
Country: U.S.A.
Contact_Voice_Telephone: 786-7000
Contact_Facsimile_Telephone: 907-786-7036
Contact_Electronic_Mail_Address: agdcweb@usgs.gov
Distribution_Liability:

Metadata_Reference_Information:
Metadata_Date: 19990526
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Data Base Administrator
Contact_Organization: U.S.G.S EROS Alaska Field Office
Contact_Address:
Address_Type: Mailing and Physical Address
Address: 4230 University Dr.
City: Anchorage
State_or_Province: AK
Postal_Code: 99508-4664
Country: U.S.A.
Contact_Voice_Telephone: 786-7000
Contact_Facsimile_Telephone: 907-786-7036
Contact_Electronic_Mail_Address: agdcweb@usgs.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998


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