Metro Land Cover, 1998 Metadata

Land Cover, 1998 - Coverage version
	1. Identification Information 2. Data Quality Information 3. Spatial Data Organization Information 4. Spatial Reference Information 5. Entity and Attribute Information 6. Distribution Information 7. Metadata Reference Information

IDENTIFICATION INFORMATION

1.1

Citation

Originator

Metro Data Resource Center

The Land Cover Layer was developed by updating and utilizing the 1992 land cover classification and updating areas of change or areas not previously classified. The two 1991 and 1998 Landsat TM scenes were first co-registered. Once co-registered, a multi-temporal image data set was produced by combining one band from each date of imagery into a single image data set. A simple classification of this merged data identified areas that had undergone land cover change between 1991 through 1998. Digital image processing techniques were used to digitally discriminate and map those areas of significant land cover change since 1991. Once the areas of change were identified, their current land cover and land use status was classified by manual photo-interpretation. The newly classified areas were manually edited or relabeled directly on the TM imagery. This task resulted in the digital capture of updated land cover and land use information in a GIS data layer that is co-registered to the original 1992 land cover classification. Once the updated areas of change were digitally captured and mapped, the GIS layer(s) containing the updates was integrated with the existing land cover map producing a new 1998-current land cover and land use classification for the previously mapped area. Classification of any new areas in the project study area that were not previously mapped in the 1992 classification was accomplished using a combination of the 1998 Landsat TM imagery, aerial photography, and digital orthophotos. A two-acre minimum mapping unit was utilized in the updating and development of the 1998 land cover classification. This phase of the project resulted in a digital raster GIS data layer in which the entire study area is classified according to a generalized classification scheme of the 1992 land cover map.

Purpose

To determine the pattern of land cover within the Portland metropolitan area. Not appropriate to use or analyze this data at the pixel level. Most useful when used on an aggregate basis.

Supplemental information

The TIFF on RLIS Lite includes an HTML document with a corresponding names as a legend.

1.3

Time period of content

Maintenance/update frequency

Urban Clackamas County, Multnomah County, and Washington County, Oregon

West bounding coordinate

-123.15156069

East bounding coordinate

-122.31651100

North bounding coordinate

45.70263875

South bounding coordinate

45.23396470

1.6

Keywords

Theme keyword thesaurus

None

Theme keyword

land cover, canopy, forest

Place keyword thesaurus

None

Place keyword

Portland, Multnomah County, Washington County, Clackamas County, Oregon

These data are sold under the agreement that the user may use the data in its business activity and for no other purpose whatsoever. User shall not allow access to the data by any other person or organization, unless authorized in writing by the Metro DRC or, if the other party is a contractor providing services to a government requiring usage of the data in order to provide contractual services.
User shall not duplicate the data except for the following:
(1) User may make one backup copy of the data, and
(2) User may translate the data into other formats and/or media.
For full product purchase agreement that accompanies these data, please see http://storefront.metro-region.org/drc/rlislite/subscribe/license.cfm

1.10

Browse graphic

Browse graphic file name

Browse graphic file description

Browse graphic file type

1.13

Native data set environment

Shape file: Landco98.tif
Cover name: $GRIDS/environ/landc98
Software/hardware: ArcInfo 8.1 on NT workstation.
ArcSDE 8.1 on Compaq Alpha 4100. Tru64 5.0 OS.

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DATA QUALITY INFORMATION

2.4

Horizontal positional accuracy

Landsat TM Imagery

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SPATIAL DATA ORGANIZATION INFORMATION

3.2

Direct spatial reference method

Raster

3.3

Point and vector object information

SDTS point and vector object type

Point and vector object count

3.4

Raster object information

SPATIAL REFERENCE INFORMATION

4.1

Horizontal Coordinate System

Grid coordinate system name

State plane coordinate system 1983.

SPCS zone identifier

5076

Planar distance units

International feet

Horizontal datum name

North American Datum of 1983/1991 (HPGN)

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ENTITY AND ATTRIBUTE INFORMATION

5.2

Overview description

Table Name	Column	Sample Domain Value	Definition
Landc98.vat	--	--	1998 Land Cover
	landc98.vat	--	1998 Land cover classification
		2	barren and sparsely vegetated
		1	water
		3	low structure agriculture
		4	high structure agriculture
		5	deciduous closed canopy forest
		6	mixed closed canopy forest
		7	conifer closed canopy forest
		8	deciduous open canopy forest
		9	mixed open canopy forest
		10	conifer open canopy forest
		11	deciduous scattered canopy forest
		12	mixed scattered canopy forest
		13	conifer scattered canopy forest
		14	closed canopy shrub
		15	open canopy shrub
		16	scattered canopy shrub
		17	meadow/grass