Critical Trends Assessment Land Cover Database of Illinois, 1991-1995

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Frequently-anticipated questions:


What does this data set describe?

Title:
Critical Trends Assessment Land Cover Database of Illinois, 1991-1995
Abstract:
County by county land cover grid data for 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, two dates for each of ten 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.
  1. How should this data set be cited?

    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.

    Online Links:

    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.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -91.7
    East_Bounding_Coordinate: -87.5
    North_Bounding_Coordinate: 42.76
    South_Bounding_Coordinate: 36.9

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 17-Apr-1991
    Ending_Date: 30-May-1995
    Currentness_Reference: Acquisition date of raw imagery by satellite

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: remote-sensing image

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Raster data set. It contains the following raster data types:

      • Dimensions varies for each county x varies for each county, type Grid Cell

    2. What coordinate system is used to represent geographic features?

      The map projection used is Lambert Conformal Conic.

      Projection parameters:
      Standard_Parallel: 33 0 0.000
      Standard_Parallel: 45 0 0.000
      Longitude_of_Central_Meridian: -89 30 0.000
      Latitude_of_Projection_Origin: 33 0 0.000
      False_Easting: 914400.00000 meters
      False_Northing: 0.00000

      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.

  7. How does the data set describe geographic features?

    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.)

    Entity_and_Attribute_Detail_Citation: none


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

  3. To whom should users address questions about the data?

    Contact_Instructions: Please refer to the Distribution Information section.


Why was the data set created?

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.


How was the data set created?

  1. From what previous works were the data drawn?

  2. How were the data generated, processed, and modified?

  3. What similar or related data should the user be aware of?

    , University of Illinois Web Privacy Notice.

    Online Links:

    , University Copyright Policy (stated in the General Rules Concerning University Organization and Procedure, Article III, Section 4).

    Online Links:

    , Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign.

    Online Links:


How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    No accuracy assessment of the classification has been performed.

  2. How accurate are the geographic locations?

    Agrees with the 1:100,000 vector layers very well.

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    All of Illinois is covered. A local filter was run after classification. The threshold used ranged from 2 pixels to 6 pixels.

  5. How consistent are the relationships among the observations, including topology?

    not available


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints:
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.

Use_Constraints:
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, isgs@isgs.illinois.edu. 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.

  1. Who distributes the data set? (Distributor 1 of 1)

    Information Office, Illinois State Geological Survey (ISGS), a division of the Institute of Natural Resource Sustainability (INRS) of the University of Illinois
    615 East Peabody Drive
    Champaign, Illinois 61820
    USA

    217-333-4747 (voice)
    isgs@isgs.illinois.edu

    Hours_of_Service: 8:00 a.m. - 4:30 p.m., Monday-Friday, U.S. Central Time
  2. What's the catalog number I need to order this data set?

  3. What legal disclaimers am I supposed to read?

    Refer to the Legal Notices of Terms and Conditions of the University of Illinois Web Privacy Policy (there is a link in the Cross References section) for policy statements regarding the following:

    Disclaimer of Liability Disclaimer of Warranties and Accuracy of Data Disclaimer of Endorsement Disclaimer for External Links Disclaimer of Duty to Continue Provision of Data Security Choice of Law

    By obtaining these data you agree to the provisions of the University of Illinois Web Privacy Policy, regardless of the manner in which the information was obtained.

  4. How can I download or order the data?

  5. What hardware or software do I need in order to use the data set?

    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.


Who wrote the metadata?

Dates:
Last modified: 24-Feb-2009
Metadata author:

Contact_Instructions: Please refer to the Distribution Information section.
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:


Illinois Natural Resources Geospatial Data Clearinghouse

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