Tongass National Forest Timber Type Data Set

I. IDENTIFICATION INFORMATION

1. Data Set Identity: Tongass National Forest Timber Type
Data set names: anm_tim, jun_tim, sit_tim, yak_tim

2. Originator: Tongass National Forest

3. Date:

4. Edition: n/a

5. Description: The Tongass National Forest Timber Type database is a timber oriented vegetation layer based on interpretation of aerial photography. It is the most detailed digital vegetation information currently available for substantial areas within the greater Glacier Bay ecosystem. The database contains information about timbered areas including species composition, stand density, stocking levels, stand class size, and volume. Many of these timber-oriented descriptions can be useful as surrogates for important ecological variables such as structural information about a given stand. The database also contains less detailed information on non-forest vegetation and cover types.


6. Data Set Status:

___In preparation Anticipated Completion Date_____

_X_Completed and operational

___On going Update Frequency:____

Data Set Status Comments: No updates to this data layer are anticipated. The Tongass National Forest is currently developing new vegetation data sets for their lands.


7. Geographic Coverage Description: The Tongass NF Timber Type data layer covers the Yakutat, Juneau, Hoonah and Sitka Ranger Districts, and Admiralty Island National Monument.

Please check appropriate USGS 1:250,000 maps:

_X_Atlin _X_Juneau _X_Mount Fairweather
_X_Port Alexander _X_Skagway _X_Sumdum
_X_Yakutat


8. West Bounding Coordinate: 150 00 00 W

9. East Bounding Coordinate: 143 45 00 W

10. North Bounding Coordinate: 61 30 00 N

11. South Bounding Coordinate: 59 45 00 N

12. Theme keywords:
___appraisal information
___archeology/cultural resources
___bathymetry
___birds
___boundaries
___easements
___elevation
___Exxon Valdez oil spill
___fish
___fisheries
_X_forests
___geomorphology/landforms
___hydrography
___hydrology
___infrastructure
___invertebrates
___land ownership
___land status
___land use
___mammals, marine
___mammals, terrestrial
___municipalities
___oceanography
___oiling
___precipitation
___recreation
___restoration
___roads
___shoreline
___soils
___streams, anadromous
___subsistence
_X_vegetation
___wetlands
___wildlife populations
_X_wildlife habitat
___other________

13. Access Restrictions: Data transfer costs will be based on staff time and media costs.


14. Use Restrictions: Data may not be sold.


15. Processing Information:
Software used to automate: ARC/INFO

Software Version: 7.0.3

Hardware Platform: SUN

Operating System used: UNIX

File Name: anm_tim, jun_tim, sit_tim, yak_tim

File Size:

Feature Type:

___Point (data point) ___Line (Arc) _X_Polygon ___Grid ___Text ___Other

16. Raster File Form
___ADRG ARC Digitized Raster Graphic (ARC/INFO GRID format)
___ADRI ARC Digitized Raster Imagery
___BIL Imagery, band interleaved by line
___BIP Imagery, band interleaved by pixel
___BSQ Imagery, band sequential
___DEM USGS Digital Elevation Model
___ERD74 ERDAS image files version 7.4
___ERD81 ERDAS IMAGINE image files, ver8.1
___GRAS3 GRASS (Geographic Resources
Analysis Support System)v3
___GRAS4 GRASS (Geographic Resources
Analysis Support System) v4
___IDL Interactive Data Language image file
___MOSS Multiple Overlay Statistical System
export file
___TIFF Tagged Image File Format
___Other Other Raster format not listed
________________________

17. Raster File Sensor:
___LANDSAT Thematic Mapper TM
___LANDSAT Multi­spectral scanner MSS
___NOAA AVHRR
___SPOT
___aircraft scanner_____________
___aircraft video_______________
___scanned airphotos____________
___scanned hard copy
___radar type____________________
___other not listed______________

18. Sensor Resolution______meters

19. Imagery Information
___panchromatic ___multispectral
Band width/channels used___________

20. Vector File Format:

___ARCE6 ARC/INFO Export format version 6
___ARCE7 ARC/INFO Export format 7
___ARCE ARC/INFO Export other version___
___ASCII ASCII file, formatted for text attributes, declared format
___DXF9 AUTOCAD Drawing Exchange Format, ver9
___DXF10 AUTOCAD Drawing Exchange Format,ver 10
___DXF11 AUTOCAD Drawing Exchange Format, ver 11
___DLGO US Geological Survey Digital Line
Graph­Optional Format
___DLGS US Geological Survey Digital Line
Graph­Standard Format
___ATLAS GIS______
_X_Other ARC/INFO version 7.0.3


21. Spatial Data Media Type (for data with a spatial
component not stored in a graphic, mapping or GIS
software): n/a

Automated:
Database:

Spreadsheet:

Word processor:

Other:

Non­Automated:
Hard copy textual data:

Hard copy map(s):

II. DATA QUALITY INFORMATION

1. Attribute Accuracy Explanation: Interrain Pacific has not conducted any formal accuracy assessments on this data layer or the source datasets.

Timber typing was based on original photography from the mid-1980's. As such, some of the information may be out of date. For some types of information (e.g. stable plant communities, water bodies) dated information is acceptable; vegetation subject to more rapid change is problematic. Additionally, recent assessments by the USFS have identified problems with estimation of timber volume based on this coverage.


2. Attribute Accuracy: __________% __X__Unknown_____
_X_no accuracy assessment performed on dataset


3. Description of Data Completeness: The data are complete for areas within the Tongass National Forest


4. Minimum Mapping Unit: _5_ac._ Unknown__________

5. Positional Accuracy Comments:

6. Source Information:

Tongass National Forest Timber Type:

USFS - Tongass National Forest; Chatham Area Office;
204 Saginaka Way, Sitka AK 99835;
(Contact person: Ted Faulkner)


7. Date of Source Data:

8. Scale of Source Data: 1:31,680

9. Data Processing Description: The Tongass NF Timber Type data was interpreted from aerial photography at approximately 1:30,000 scale with a minimum mapping unit of 5 acres. This interpreted data wa transferred to mylar, registered to 1:31,680 scale orthophoto base maps and hand digitized.

III. SPATIAL DATA ORGANIZATION INFORMATION

1. Data Structure:

___point (x,y)
_X_vector(line >1 x,y)
___raster (grid cell)
___tin (3 dimensional x,y,z)
___Other__________

2. Raster File Row:

3. Raster File Column:

4. Raster File Vertical:

5. Raster File Number of Bytes per Pixel:

6. Raster file origin_________


IV. SPATIAL REFERENCE INFORMATION


1. Map Projection Name

___Alaska Grid (Modified­Stereographic Conformal for Alaska)
___Alaska E (Alaska Series E)
___Albers Conical Equal Area (Alaska Standard Albers)
___Polar stereographic
___Lambert Azimuthal Equal Area
___Universal Transverse Mercator
___Other (please specify)_______________________

___State plane (Coordinate System)
_X_Geographic Reference System (If geographic please complete
coordinate units section)
Geographic Coordinate Units:
_X_Decimal degrees
___Degree and decimal minutes,
___Degree, minutes, and decimal seconds
___Other______

___Unknown

2. Map Projection Description:

units:_____________
datum:__NAD 27__________
spheriod:__CLARK 1866_______
zone:__--___________
standard parallels:
northern parallel___________
southern parallel___________
central meridian:__________
latitude of origin_________
false easting:__0__________
false northing:__0_________


V. ENTITY AND ATTRIBUTE INFORMATION

1. Attribute Labels: The Tongass NF Timber Type attributes listed below.