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Identification Information
Title: Preliminary Classification of Terrestrial Ecosystems in Southeast Alaska
Originator: The Nature Conservancy of Alaska
Publication Date: 20060101
Website URL: http://seakgis.alaska.edu/data/tsys_desc.zip
Resource(Server) URL: http://seakgis03.alaska.edu/rest/services/TNC/TNC_TerrestrialEcosys/MapServer
Abstract: The Preliminary Classification of Terrestrial Ecosystems in Southeast Alaska is based on 4 major data layers: USDA Forest Service Existing Vegetation database, the National Wetland Inventory, the USDA Forest Service Landforms and Karst from USFS soils and karst inventories. These layers were merged with auxillary sources from Landsat Enahnced Thematic Mapper (ETM) and supplemented with aspect and elevation from the Shuttle Radar Topography Mission Digital Elevation Model (SRTM DEM) . This master database retains all of the detailed features from each of these datasets to allow maximum flexibility for future researchers to use unique combinations of habitat variables that suit their subject of interest.
Purpose: This ecological classification provides a framework to synthesize complex patterns in biological communities based on the underlying processes of climate, geomorphology, geology, and hydrology. For the purposes of this preliminary classification and map, the focus is on structural diversity within forest stands, including tree size and stand density, and has further stratified these clasees within valley floor landforms, upland forests, and karst forests. Within the non-forested types, we have relied upon the descriptions contained in the Existing Vegetation database with additional detail provided by the National Wetlands data sets were in close agreement.
Progress: Completed
Frequency: As needed
Time Period of Content
Single Date
Date: 20060101
Currentness: ground condition
West Bounding Longitude: -140.289148
East Bounding Longitude: -129.093272
North Bounding Latitude: 60.713256
South Bounding Latitude: 54.137022
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Point of Contact
Organization: The Nature Conservancy of Alaska
Person: David Albert
Contact Position: GIS Data Manager
Address Type: mailing and physical
Address: 119 Seward St. #2
City: Juneau
State: AK
Postal Code: 99801
Telephone: (907) 586-2301
Fax: (907) 586-8622
Email: dalbert@tnc.org
Browse Graphic
Browse Graphic URL: http://seakgis.alaska.edu/data/thumbnails/tsys_desc.jpg
Browse Graphic Caption: Regional overview of the dataset.
Browse Graphic Type: JPEG
Constraints
Access: The Nature Conservancy reserves all rights in data provided. All data are provided as is. This is not a survey quality dataset. The Nature Conservancy makes no warranty as to the currency, completeness, accuracy or utility of any specific data. This disclaimer applies both to individual use of the data and aggregate use with other data. It is strongly recommended that careful attention be paid to the contents of the metadata file associated with these data.
Use: The Nature Conservancy shall not be held liable for improper or incorrect use of the data described and/or contained herein. Any sale, distribution, loan, or offering for use of these digital data, in whole or in part, is prohibited without the approval of the Nature Conservancy. The use of these data to produce other GIS products and services with the intent to sell for a profit is prohibited without the written consent of the Nature Conservancy. All parties receiving these data must be informed of these restrictions. The Nature Conservancy shall be acknowledged as data contributors to any reports or other products derived from these data.
Theme Keywords
Theme Reference: None
Theme Topics: classificaton, Existing Vegetation Database, species composition, GIS mapping, soils, land status, database, National Wetlands Inventory, plant communities, timber inventory, terrestrial ecosystems, timber type, ecosystem classificaton
Keywords
Theme Reference: ISO 19115 Topic Categories
Theme Keywords: biota
Place Keyword Thesaurus: None
Place Keyword: Tongass National Forest, Alexander Archipelago, province, Southeast Alaska
Data Quality Information
Logical Consistency Report: All raster data sets contributing to the development of this model were resampled to a common 25m grid using a nearest neighbor assignment for categorical and bilinear interpolation for floating point grids prior to application of the model parameters.
Completeness Report: n/a
Processing Steps
Step 1 Process Description: See Eds. Schoen & Dovichin, 2006
Step 1 Process Date: 20060101
Spatial Reference Information
Geodetic Model
Horizontal Datum Name: D North American 1983
Ellipsoid Name: GRS 1980
Semi-major Axis: 6378137.0
Denominator of Flattening Ratio: 298.257222101
Metadata Reference Information
Metadata Creation Date: 20140617
Organization: The Nature Conservancy of Alaska
Person: David Albert
Contact Position: GIS Data Manager
Address Type: mailing and physical
Address: 119 Seward St. #2
City: Juneau
State: AK
Postal Code: 99801
Telephone: (907) 586-2301
Fax: (907) 586-8622
Email: dalbert@tnc.org
Metadata Standard Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata Standard Version: FGDC-STD-001-1998
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