Dr. Donald Luman, Mark Joselyn, Liane Suloway, Illinoi, 199603, Critical Trends Assessment Land Cover Database of Illinois, 1991-1995:, Illinois State Geological Survey, Champaign, Illinois.This is part of the following larger work.
Illinois Natural History Survey, Illinois State Geological Survey, Illino, 199603, Critical Trends Assessment Land Cover Database of Illinois, 1991-1995: Illinois Department of Natural Resources, Champaign, Illinois.
This is a Raster data set. It contains the following raster data types:
The map projection used is Lambert Conformal Conic.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest unknown
Ordinates (y-coordinates) are specified to the nearest unknown
Planar coordinates are specified in feet
The horizontal datum used is NAD27.
The ellipsoid used is CLARKE1866.
The semi-major axis of the ellipsoid used is 6378206.4 meters.
The flattening of the ellipsoid used is 1/294.98.
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.)
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.
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, Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign.
No accuracy assessment of the classification has been performed.
Agrees with the 1:100,000 vector layers very well.
All of Illinois is covered. A local filter was run after classification. The threshold used ranged from 2 pixels to 6 pixels.
Are there legal restrictions on access or use of the data?
- This information must be obtained directly from the INRS or from an authorized distributor. Be aware that INRS information obtained from an unauthorized third party may have been altered subsequent to original distribution, or may no longer be current.
Any access to these data, Web sites, computer systems, electronic services, and electronic networks is governed by University and campus policies, in particular, but not limited to, the Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign, and the University of Illinois Web Privacy Notice.
Links to these are provided in the Cross References section.
- This information is the property of and copyrighted by the Board of Trustees of the University of Illinois with all rights reserved. University copyright policy is stated in the General Rules Concerning University Organization and Procedure, Article III, Section 4. A link is provided in the Cross References section.
Individuals or entities may make fair use of copyrighted this material, such as reproducing a single figure or table, or using a brief text quotation, without obtaining formal permission, but in all cases the Illinois Natural History Survey must be credited as the source of the material. To reproduce this information beyond the fair use standard, permission must be obtained from the INHS care of ISGS Information Office, 615 East Peabody Drive, Champaign, Illinois 61820, 217-333-4747, firstname.lastname@example.org. License fees and a license agreement may be required, depending on the proposed usage.
Any use of these data is governed by University and campus policies, in particular, but not limited to, the Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign, and the University of Illinois Web Privacy Notice. Links to these are provided in the Cross References section.
Map information is to be used at a scientifically and cartographically appropriate scale, that is, at a scale no greater than indicated on the map or as described in the documentation of the map or map data. Map information is not appropriate for, and is not to be used as, a geodetic, legal, or engineering base. Map information has no legal basis in the definition of boundaries or property lines and is not intended as a substitute for surveyed locations such as can be determined by a registered Public Land Surveyor.
The data do not replace the need for detailed site-specific studies.
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The data are intended for use with GIS software. The ISGS uses ESRI ArcGIS software, however, ESRI formats can be imported into many different GIS software packages. It is expected that customers who obtain these data have the technical expertise to use GIS software. The ISGS does not provide software support of any kind.
Illinois Natural Resources Geospatial Data ClearinghouseGenerated by mp version 2.8.25 on Wed Apr 08 12:04:06 2009