Washington Gap Project 1991 Land Cover for Washington State

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Cassidy, K. M.
Publication_Date: 19970101
Title:
Washington Gap Project 1991 Land Cover for Washington State
Edition: Version 5
Publication_Information:
Publication_Place: Seattle, WA
Publisher:
Washington Cooperative Fish and Wildlife Research Unit, University of Washington
Online_Linkage: http://wdfw.wa.gov/conservation/gap/gapdata/lcv5
Larger_Work_Citation:
Citation_Information:
Originator: Cassidy, K. M.
Publication_Date: 19970101
Title:
Land cover of Washington State: Description and management
Series_Information:
Series_Name: Gap Analysis of Washington State - Final Report
Issue_Identification: Volume 1
Publication_Information:
Publication_Place: Seattle, WA
Publisher:
Washington Cooperative Fish and Wildlife Research Unit, University of Washington
Other_Citation_Details:
This volume is the first volume of the 5-volume set (with one supplement), titled "Gap Analysis of Washington State - Final Report".
Description:
Abstract:
Polygon land cover and land use data for Washington State derived from 1991 TM data, with a nominal minimum mapping unit of 100 hectares.
Purpose:
To map the land cover of Washington State, to aid in identification of conservation priorities, and to serve as a basis for modeling terrestrial vertebrate distributions.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19910522
Ending_Date: 19910803
Currentness_Reference: TM scene dates
Status:
Progress: Complete
Maintenance_and_Update_Frequency:
Version 5 has had one update, to version 6. The changes between the two versions are fairly minor: a bit more detail was added in Adams County and in Asotin County. Version 6 and associated data dictionary information may be downloaded from http://wdfw.wa.gov/conservation/gap/gapdata/lcv6
Spatial_Domain:
Description_of_Geographic_Extent: Washington State
Bounding_Coordinates:
West_Bounding_Coordinate: -125
East_Bounding_Coordinate: -116.875
North_Bounding_Coordinate: 49
South_Bounding_Coordinate: 45.5
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Land cover
Theme_Keyword: Ecozone
Theme_Keyword: Ecoregion
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Pacific Northwest
Place_Keyword: Washington
Stratum:
Stratum_Keyword_Thesaurus: None
Stratum_Keyword: none
Temporal:
Temporal_Keyword_Thesaurus: None
Temporal_Keyword: none
Taxonomy:
Taxonomic_Keywords: Vegetation
Access_Constraints: None
Use_Constraints:
None. User should be aware of scale limitations, however.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Kelly M. Cassidy
Contact_Organization:
Washington Cooperative Fish and Wildlife Research
Unit
Contact_Position: Washington State Gap Analysis Project Leader
Contact_Address:
Address_Type: Mailing and Physical Address
Address:
Washington Cooperative Fish and Wildlife Research
Unit
Address: MS 357980
Address: University of Washington
City: Seattle
State_or_Province: WA
Postal_Code: 98195
Country: USA
Contact_Voice_Telephone: 206-543-6475
Hours_of_Service: 8:00 a.m. to 4:00 p.m. Monday Through Friday
Contact_Instructions:
Kelly Cassidy will not be at the Coop Unit after 1998, but they will be able to provide a contact location
Browse_Graphic:
Browse_Graphic_File_Name: http://wdfw.wa.gov/conservation/gap/gapdata/lcv5/browse.jpg
Browse_Graphic_File_Description: Gap vegetation, NW Washington
Browse_Graphic_File_Type: JPEG
Native_Data_Set_Environment: Arc/Info 7.0

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
No accuracy assessment was performed on land use polygons. We collected non-random ground data, but the ground data were all used to assist in labeling; none were set aside for accuracy assessment. Since we knew in advance that we were unlikely to afford an accuracy assessment, we avoided labeling beyond the level at which we felt reasonably confident. Thus, we delineated vegetation zones, for example, but did not specify cover to dominant species, which is difficult to reliably determine with TM imagery. Actual accuracy will depend on the amount of ground data for an area, the familiarity of the labeler with the area, the simplicity or complexity of the cover, cover fragmentation, and scene date.
Quantitative_Attribute_Accuracy_Assessment:
Attribute_Accuracy_Value: Unknown
Attribute_Accuracy_Explanation:
No accuracy assessment was done on land cover/land use attributes
Logical_Consistency_Report:
Polygons were checked to verify that there was one and only one label for each polygon using the Arc facility LABELERRORS. All polygons have a unique polygon ID. The cover was not cleaned of all dangling arcs. Arcs may also be split at places other than intersections.
Completeness_Report:
Land cover for the entire state was completed, but some areas of the state are better delineated than others because of ease of cover identification, ruggedness of terrain, fragmentation of cover, and familiarity of the labeler with the area. The nominal minimum mapping units were 100 hectares for non-wetland cover and 40 hectares for wetlands. In practice, some smaller areas were delineated. In particular, all offshore islands large enough to be seen on TM imagery (at least approximately 50 meters wide) were delineated because of their importance to nesting shore birds. Conversely, some polygons are much larger than 100 hectares because of very uniform cover types (e.g., large agricultural fields in the Columbia Basin) or because of lack of time (e.g., many areas of the Cascades with a complex mix of forest and small cuts need further delineation). Although the size of some important cover types and stands were below the minimum mapping units, we initially adhered to them. As mapping progressed, we tended toward a smaller mapping unit more closely matched to the landscape and stand size. For example, much US Forest Service land is a patchwork of 5- to 30-hectare cuts among old forest; a 100-hectare mapping unit gives a poor representation of this landscape. The effort to map these features, was not uniform because of time constrainsts, but fragmented forest landscapes are deliated below the 100-hectare mapping unit in some parts of the state. Another common problem was adequate representation of highly fragmented developed areas, where boundaries between development levels were unclear. Often, major roads were used as convenient boundaries, but urban areas, especially the Spokane area, needed more work.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The positional accuracy of the TM scenes (root mean square error) on which the map is based is 1 to 2 pixels (25 to 50 meters). Polygon delineation was performed with the TM scenes as a backdrop, but often done with a large area displayed, so the delineator could see patterns over a large area. The positional accuracy of polygon boundaries for cover types with an abrupt border is generally approximately 4 or 5 pixels (100 to 125 meters). For cover types with fuzzy boundaries, such as in highly fragmented urban landscapes or in forests where cover type changes gradually, positional acuracy is somewhat indeterminate. Underlying TM scenes were georectified and terrain corrected by EOSAT.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report: See horizontal positional accuracy
Lineage:
Methodology:
Methodology_Type: On-screen delineation with TM scenes as a backdrop
Methodology_Identifier:
Methodology_Keyword_Thesaurus: None
Methodology_Description:
Polygons were delineated at a nominal minimum mapping unit of 100 hectare using spectrally clustered TM imagery as a backdrop.
Methodology_Citation:
Source_Information:
Source_Citation:
Citation_Information:
Originator: TM scenes from Landsat 5
Publication_Date: 1991
Title: 1991 TM scenes for Washington State
Other_Citation_Details:
16 full or partial TM scenes. All but one were from 1991. See Cassidy 1997 for a list of scenes and dates.
Larger_Work_Citation:
Citation_Information:
Originator: Cassidy, K. M.
Publication_Date: 19970101
Title:
Land cover of Washington State: Description and management
Series_Information:
Series_Name: Gap Analysis of Washington State - Final Report
Issue_Identification: Volume 1
Publication_Information:
Publication_Place: Seattle, WA
Publisher:
Washington Cooperative Fish and Wildlife Research Unit, University of Washington
Other_Citation_Details:
This volume is the first volume of the 5-volume set (with one supplement), titled "Gap Analysis of Washington State - Final Report".
Type_of_Source_Media: Digital raster files
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19910522
Ending_Date: 19910803
Source_Currentness_Reference: Ground Condition
Source_Citation_Abbreviation: None
Source_Contribution: Primary basis of land cover map
Process_Step:
Process_Description:
Satellite data were spectrally clustered and colored, with colors indicating pixels of similar spectral reflectance. Individual spectral classes were not matched with specific land cover types, but spectrally clustered data were used as a backdrop for manual land cover polygon delineation and interpretation.
Process_Date: 1992 to 1996
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Kelly M. Cassidy
Contact_Organization:
Washington Cooperative Fish and Wildlife Research
Unit
Contact_Position: Washington State Gap Analysis Project Leader
Contact_Address:
Address_Type: Mailing and Physical Address
Address:
Washington Cooperative Fish and Wildlife Research
Unit
Address: MS 357980
Address: University of Washington
City: Seattle
State_or_Province: WA
Postal_Code: 98195
Country: USA
Contact_Voice_Telephone: 206-543-6475
Hours_of_Service: 8:00 a.m. to 4:00 p.m. Monday Through Friday
Contact_Instructions:
Kelly Cassidy will not be at the Coop Unit after 1998, but they will be able to provide a contact location

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: State Plane Coordinate System 1927
State_Plane_Coordinate_System:
SPCS_Zone_Identifier: 4602
Lambert_Conformal_Conic:
Standard_Parallel: 45.833333
Longitude_of_Central_Meridian: -120.5
Latitude_of_Projection_Origin: 45.333333
False_Easting: 609601.2192
False_Northing: 0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 82.02
Ordinate_Resolution: 82.02
Planar_Distance_Units: feet
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1927
Ellipsoid_Name: Clarke 1866
Semi-major_Axis: 6378206.4
Denominator_of_Flattening_Ratio: 294.98

Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
Each polygon was labeled with several attributes: ecoregion; vegetation zone; primary, secondary, and tertiary land cover; the respective occupancy classes of the primary, secondary, and tertiary cover in each polygon; labeling date; the source of the information for the label if the label was based on information other than the appearance of the polygon from the satellite data; the person doing the labeling; and comments. An ecoregion was defined as a contiguous geographic area of similar climate and geologic history (e.g., the Blue Mountains or Northwest Cascades region). A vegetation zone was defined as an area in which moisture, temperature, elevation, and other environmental parameters combine to create conditions that favor similar vegetation communities (e.g., the Ponderosa Pine or Alpine/Parkland zone). Primary, secondary, and tertiary cover types were recorded since the polygons were delineated with a 100 hectare minimum mapping unit for terrestrial cover types, and 40 hectares for wetlands; therefore, the land cover within a given polygon could be heterogeneous. The primary land cover was the actual land cover that occupied the greatest proportion of the area in a polygon (e.g., closed-canopy conifer forest or non-irrigated row-crop agriculture). Secondary and tertiary land covers, if needed, were the actual land covers that occupied the second and third greatest proportion of area in the polygon. Primary, secondary, and tertiary covers were each assigned one of six occupancy classes indicating the proportion of the polygon occupied by each.
Entity_and_Attribute_Detail_Citation:
A complete data dictionary (Microsoft Wordpad format) may be downloaded from http://wdfw.wa.gov/conservation/gap/gapdata/lcv5

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Washington Department of Fish and Wildlife
Contact_Position:
Technical Services Manager - Wildlife Management Program
Contact_Address:
Address_Type: Mailing Address
Address: 600 Capitol Way North
City: Olympia
State_or_Province: Washington
Postal_Code: 98501
Country: USA
Contact_Voice_Telephone: 360-902-2515
Hours_of_Service: 8:00 a.m. to 4:00 p.m. Monday Through Friday
Resource_Description: Gap Landcover Version 5
Distribution_Liability:
Although these data have been processed successfully on a computer system at the Washington Department of Fish and Wildlife, no warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. It is strongly recommended that these data are directly acquired from a Washington Department of Fish and Wildlife server, and not indirectly through other sources which may have changed the data in some way. It is also strongly recommended that careful attention be paid to the contents of the metadata file associated with these data. The Washington Department of Fish and Wildlife shall not be held liable for improper or incorrect use of the data described and/or contained herein.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ARCE
Format_Version_Number: Version 7.1
File_Decompression_Technique: gzip
Transfer_Size: 9.8
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://wdfw.wa.gov/conservation/gap/gapdata/lcv5
Network_Address:
Network_Resource_Name:
http://wdfw.wa.gov/conservation/gap/land_cover_data.html
Fees: None
Custom_Order_Process: None

Metadata_Reference_Information:
Metadata_Date: 19981104
Metadata_Review_Date: 19981104
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Washington Department of Fish and Wildlife
Contact_Position:
Technical Services Manager - Wildlife Management Program
Contact_Address:
Address_Type: Mailing Address
Address: 600 Capitol Way North
City: Olympia
State_or_Province: Washington
Postal_Code: 98501
Country: USA
Contact_Voice_Telephone: 360-902-2515
Hours_of_Service: 8:00 a.m. to 4:00 p.m. Monday Through Friday
Metadata_Standard_Name:
NBS Content Standards for National Biological Information Infrastructure Metadata
Metadata_Standard_Version:
NBII Draft of June 1997, Based FGDC of June 8, 1994
Metadata_Access_Constraints: None
Metadata_Use_Constraints: None
Metadata_Security_Information:
Metadata_Security_Classification_System: None
Metadata_Security_Classification: Unclassified
Metadata_Security_Handling_Description: None

Generated by mp on Wed Dec 9 11:06:35 1998