FGDC Compliant Metadata for the
Critical Trends Assessment Land cover Database of Illinois

1. IDENTIFICATION INFORMATION

1.1 CITATION
(8.1)  ORIGINATOR: Dr. Donald Luman, Mark Joselyn, Liane Suloway, Illinois
Department of Natural Resources
(8.2)  PUBLICATION DATE: 3-96
(8.4)  TITLE: Critical Trends Assessment Land cover Database of Illinois,
1991-1995
(8.6)  GEOSPATIAL DATA PRESENTATION FORM: remote sensing image
(8.7)  SERIES INFORMATION
(8.7.1)  SERIES NAME: na
(8.7.2)  ISSUE IDENTIFICATION: na
(8.8)  PUBLICATION INFORMATION
(8.8.1)  PUBLICATION PLACE: Champaign, Illinois
(8.8.2)  PUBLISHER: Illinois Department of Natural Resources
(8.9)  OTHER CITATION DETAILS:
(8.11) LARGER WORK CITATION:  Critical Trends Assessment Land cover
Database of Illinois, 1991-1995, Illinois Natural History Survey, Illinois State
Geological Survey, Illinois Department of Natural Resources.

1.2 DESCRIPTION
1.2.1 ABSTRACT:  Land cover map of Illinois derived from Thematic Mapper (TM)
Satellite data from the Landsat 4 sensor. Dates of the Imagery used range from
April, 1991 to May, 1995. 21 Scenes were used, 2 dates for each of 10 scene areas
needed to cover the state (Path/Row 24/31, 24/32, 24/33, 23/31, 23/32, 23/33, 23/34,
22/32, 22/33, 22/34) with an additional single scene needed to fill a small area
along the northern border (24/30). Raw data were obtained in Space Oblique
Mercator projection for 14 scenes, 7 scenes were delivered in UTM zone 16.
Georeferenced data were modified using vector field segmentation with a threshold
of 70 prior to being separated into urban and non-urban sets which were then
clustered using PCI Image Processing software's ISOCLUS (ISODATA) algorithm.
In addition, areas falling under a modified boundary of municipal areas
determined by the 1992 TIGER/Line files was used to identify built up areas in
the non-urban landscape. The urban classes for these areas were imposed upon
the non-urban classified landscape. In general 250 spectral clusters were identified
in the non-urban areas with 100 to 150 clusters being identified for the urban
areas. A Maximum Likely Classification was run using the signatures generated
by ISOCLUS to create the theme channel used for coding. Ancillary data included
the Illinois Wetlands Inventory, NRCS (ASCS) county crop compliance data, 1988
CIR NAPP photography (20% sample), 1988 BW NAPP (100%) sample, DNR
digital vector roads, streams, and railroads. Nineteen Land cover classes were
identified. These data are provided on the CD on a county by county basis. There
is a single grid for each county.

1.2.2 PURPOSE: This database was completed as an integral part of the Critical
Trends Assessment Project. It is intended to serve as a base line for assessment
and management of biologic natural resources in Illinois. It is a good medium
scale land cover map of the entire state.
 
1.3 TIME PERIOD OF CONTENT
(9.1) SINGLE DATE/TIME
(9.1.1) CALENDAR DATE: 19910417 (initial acquisition date)
(9.1.1) CALENDAR DATE: 19950530 (final acquisition date)
1.3.1 CURRENTNESS REFERENCE: Acquisition date of raw imagery by satellite
 
1.4 STATUS
1.4.1 PROGRESS: Completed
1.4.2 MAINTENANCE AND UPDATE FREQUENCY: Unknown, Accuracy
Assessment yet to be completed

1.5 SPATIAL DOMAIN
1.5.1 BOUNDING COORDINATES
1.5.1.1 WEST BOUNDING COORDINATE:  -91.7
1.5.1.2 EAST BOUNDING COORDINATE:  -87.5
1.5.1.3 NORTH BOUNDING COORDINATE: 42.76 
1.5.1.4 SOUTH BOUNDING COORDINATE: 36.9

1.6 KEYWORDS
1.6.1 THEME
1.6.1.1 THEME KEYWORD THESAURUS: none
1.6.1.2 THEME KEYWORD:  land cover
1.6.1.2 THEME KEYWORD:  satellite
1.6.1.2 THEME KEYWORD:  imagery
1.6.2 PLACE
1.6.2.1 PLACE KEYWORD THESAURUS: none
1.6.2.2 PLACE KEYWORD: Illinois

1.7 ACCESS CONSTRAINTS: none
 
1.8 USE CONSTRAINTS: Identification of Illinois Department of Natural
Resources, Critical Trends Assessment Project as the source.

1.9 POINT OF CONTACT
(10.2) CONTACT ORGANIZATION PRIMARY: Illinois Natural History Survey
(10.3) CONTACT POSITION: GIS staff
(10.4) CONTACT ADDRESS
(10.4.1) ADDRESS TYPE: postal
(10.4.2) ADDRESS: 607 East Peabody Drive
(10.4.3) CITY: Champaign
(10.4.4) STATE OR PROVINCE: IL
(10.4.5) POSTAL CODE: 61820
(10.4.6) COUNTRY: USA
(10.5) CONTACT VOICE TELEPHONE: (217) 244-2160
(10.7) CONTACT FACSIMILE TELEPHONE: (217) 333-4949
(10.8) CONTACT ELECTRONIC MAIL ADDRESS: joselyn@uiuc.edu

1.13 NATIVE DATA SET ENVIRONMENT: PCI, PCDSK file; ESRI version 7.0.3
Grid

2. DATA QUALITY INFORMATION

2.1 ATTRIBUTE ACCURACY
2.1.1 ATTRIBUTE ACCURACY REPORT: No accuracy assessment of the
classification has been performed.
2.2 LOGICAL CONSISTENCY REPORT: na
2.3 COMPLETENESS REPORT: All of Illinois is covered. A local filter was run
after classification. The threshold used ranged from 2 pixels to 6 pixels.
2.4 POSITIONAL ACCURACY
2.4.1 HORIZONTAL POSITIONAL ACCURACY
2.4.1.1 HORIZONTAL POSITIONAL ACCURACY REPORT: Agrees with the
1:100,000 vector layers very well
 
3. SPATIAL DATA ORGANIZATION INFORMATION
 
3.2 DIRECT SPATIAL REFERENCE METHOD: Raster
3.4 RASTER OBJECT INFORMATION
3.4.1 RASTER OBJECT TYPE: Grid Cell
3.4.2 ROW COUNT: varies for each county
3.4.3 COLUMN COUNT: varies for each county

4. SPATIAL REFERENCE INFORMATION

4.1 HORIZONTAL COORDINATE SYSTEM DEFINITION
4.1.2 PLANAR
4.1.2.1 MAP PROJECTION
4.1.2.1.1 MAP PROJECTION NAME: Lambert Conformal Conic
4.1.2.1.2 MAP PROJECTION-PARAMETERS
4.1.2.1.2.1 LATITUDE OF FIRST STANDARD PARALLEL: 33  0  0.000
4.1.2.1.2.1 LATITUDE OF SECOND STANDARD PARALLEL: 45  0  0.000
4.1.2.1.2.2 LONGITUDE OF CENTRAL MERIDIAN: -89 30  0.000
4.1.2.1.2.3 LATITUDE OF PROJECTION ORIGIN: 33  0  0.000
4.1.2.1.2.4 FALSE EASTING: 914400.00000
4.1.2.1.2.5 FALSE NORTHING: 0.00000
4.1.4 GEODETIC MODEL
4.1.4.1 HORIZONTAL DATUM NAME: NAD27
4.1.4.2 ELLIPSOID NAME: CLARKE1866
4.2 VERTICAL COORDINATE SYSTEM DEFINITION
4.2.1 ALTITUDE SYSTEM DEFINITION
4.2.1.1 ALTITUDE DATUM NAME: NGVD29


5. ENTITY AND ATTRIBUTE INFORMATION
 
5.2 OVERVIEW DESCRIPTION
5.2.1 ENTITY AND ATTRIBUTE OVERVIEW:
LAND COVER CLASSES:
NOTE: Class values stored in item VALUE for each Arc/Info Grid

Urban and Built-Up Land
  1 - High Density (all or most of the surface cover is comprised of impervious
material)
  2 - Medium-High Density (transitional between Medium and High Density;
located in Cook County only)
  3 - Medium Density (a significant proportion of the surface cover is comprised of
impervious material)
  4 - Low Density (small amount of surface area comprised of impervious material
mixed with other land cover such as Grassland, Wooded Land, etc.)

Transportation [ONLY PRESENT IN land2utm]
  5 - Major Roadways (Major Highways updated 1992)
  6 - Active Railroads (1991)
  7 - Abandoned Railroads (1991)

Crop Land
  8 -  Row Crop (corn, soybeans, and other tilled crops)
  9 -  Small Grains (wheat, oats, etc.)
  10 - Orchards/Nurseries

Grassland
  11 - Urban Grassland (parks, residential lawns, golf courses, cemeteries, and
other open space)
  12 - Rural Grassland (pastureland, grassland, waterways, buffer strips, CRP
land, etc.)

Wooded and Forested Land
  13 - Deciduous: undifferentiated broadleaf deciduous, closed canopy
  14 - Deciduous: undifferentiated broadleaf deciduous, open canopy
  15 - Coniferous: undifferentiated

  16 - Open Water
  17 - Perennial Streams [ONLY PRESENT IN land2utm]

Wetland
  18 - Shallow Marsh/Wet Meadow
  19 - Deep Marsh
  20 - Forested Wetlands
  21 - Swamp
  22 - Shallow Water Wetlands

  23 - Barren Land (e.g., quarries, sandy beaches, exposed soil surfaces, etc.)

7. METADATA REFERENCE SECTION

7.1 METADATA DATE: 19960208
7.4 METADATA CONTACT
(10.1) CONTACT PERSON PRIMARY
(10.1.1) CONTACT PERSON: Mark Joselyn
(10.1.2) CONTACT ORGANIZATION: Illinois Natural History Survey
(10.4) CONTACT ADDRESS
(10.4.1) ADDRESS TYPE: Postal
(10.4.2) ADDRESS: 607 East Peabody Drive
(10.4.3) CITY: Champaign
(10.4.4) STATE OR PROVINCE: IL
(10.4.5) POSTAL CODE: 61820
(10.4.6) COUNTRY: USA
(10.5) CONTACT VOICE TELEPHONE: 217-244-2160
(10.7) CONTACT FACSIMILE TELEPHONE: 217-333-4949
(10.8) CONTACT ELECTRONIC MAIL ADDRESS: joselyn@uiuc.edu