Illinois Statewide 30-Meter Shaded Relief Image

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Frequently-anticipated questions:


What does this data set describe?

Title: Illinois Statewide 30-Meter Shaded Relief Image
Abstract:
This is a shaded relief image of Illinois in ArcSDE raster format. The data are stored in UTM coordinates, using a Transverse Mercator projection with the parameters of UTM Zone 16, NAD27. The data have a 30-meter ground resolution.

The source DEM is a mosaicked model of USGS 30x30 meter DEMs, showing 1:24,000-SCALE quadrangle map boundaries that extend in an irregular buffer outside the state boundary. The source DEM is stored in the ISGS GIS database as GISDB.IL_DEM_30M_RAS.

  1. How should this data set be cited?

    Luman, Donald, Smith, Lisa, and Goldsmith, Chris, 2003, Illinois Statewide 30-Meter Shaded Relief Image: ISGS GIS Database GISDB.IL_DEM_SHADED_RELIEF_30M_RAS, Illinois State Geological Survey, Champaign, IL.

    Online Links:

    This is part of the following larger work.

    Luman, Donald, Smith, Lisa, and Goldsmith, Chris, 2003, Illinois Surface Topography: Illinois Map 11, Illinois State Geological Survey, Champaign, Illinois, USA.

    Other_Citation_Details: Scale, 1:500,000. Size, 36 x 54 inches. Color.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -91.5336
    East_Bounding_Coordinate: -87.2490
    North_Bounding_Coordinate: 42.6108
    South_Bounding_Coordinate: 36.8568

  3. What does it look like?

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

    Calendar_Date: 18-Oct-2001
    Currentness_Reference: Last update with updated USGS DEM data

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

    Geospatial_Data_Presentation_Form: raster digital data

  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 21661 x 12665 x 1, type Pixel

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

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 16
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -87.000000
      Latitude_of_Projection_Origin: 0.000000
      False_Easting: 500000.000000
      False_Northing: 0.000000

      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 30.000000
      Ordinates (y-coordinates) are specified to the nearest 30.000000
      Planar coordinates are specified in meters

      The horizontal datum used is North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.400000.
      The flattening of the ellipsoid used is 1/294.978698.

      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:

  7. How does the data set describe geographic features?

    Band_1

    ObjectID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Value

    Count


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?

These data were developed to produce an ISGS publication entitled Illinois Surface Topography, Illinois Map 11, 2003.

These data are appropriate for use in local and regional elevation analysis. The data are not appropriate as a geodetic, legal or engineering base. The data set can serve as an important base cartographic and analytical element for many types of maps. The data set was not and is not intended as a substitute for surveyed elevations, such as can be determined by a registered Public Land Surveyor.


How was the data set created?

  1. From what previous works were the data drawn?

    (source 1 of 1)
    , USGS DEMs.

    Source_Scale_Denominator: 24000

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

    Date: 2001 (process 1 of 5)
    Imported USGS DEMs to ESRI GRID lattices.

    Date: 2001 (process 2 of 5)
    Standardized all DEMs to UTM 15 or 16 NAD27 with vertical units in feet, and a cell size of 30 meters. Some DEMs that had a datum of NAD83 were projected to NAD27 with cubic resampling. Vertical units were in feet, meters, and decimeters and were converted by simple multiplication and rounded to the nearest whole foot. DEMs with a 10 meter cell size were resized to a 30 meter grid spacing with cubic resampling.

    Person who carried out this activity:

    Date: 2001 (process 3 of 5)
    Due to a limitation in GRID on the number of input grids while mosaicking all the DEMs were first mosaicked into one degree blocks (latitude and longitude) and then into full mosaicks of the UTM 15 and 16 zones in Illinois. Null areas were fillled in by simple averaging of the surrounding cells.

    Person who carried out this activity:

    Date: 2001 (process 4 of 5)
    Final assembly of the statewide DEM was accomplished by reprojecting the UTM 15 side of the state to UTM 16 with cubic resampling and then mosaicking it with the UTM 16 zone.

    The shaded relief image was derived from the DEM.

    Date: 17-Dec-2003 (process 5 of 5)
    The final tif was imported into the ISGS SDE database using LZ77 compression, the GISDB_RASTER configuration keyword, and a raster block size of 80 x 80. Several test loads using ISGS procedure GISDB_0016 were performed to determine the appropriate raster block size. Pyramids were built using bilinear interpolation. Dataset statistics were calculated. Database statistics (analyze function) were calculated. The metadata were updated.

    Person who carried out this activity:

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

    , ISGS Terms of Use.

    Online Links:

    , 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?

    None.

  2. How accurate are the geographic locations?

    Should be consistant for NMAS specification for a 1:24000 scale map.

  3. How accurate are the heights or depths?

    Half the contour interval of the original USGS topographic survey. A typical interval for Illinois is ten feet although other ranges exist.

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

    None.

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

    None.


How can someone get a copy of the data set?

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

Access_Constraints:
ISGS information must be obtained directly from the ISGS or from an authorized distributor. Be aware that ISGS 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, the ISGS Terms of Use document available at the ISGS Web site, and the University of Illinois Web Privacy Notice.

Links to these are provided in the Cross References section.

Use_Constraints:
ISGS 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 ISGS 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 State Geological Survey must be credited as the source of the material. To reproduce ISGS information beyond the fair use standard, permission must be obtained from the 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, the ISGS Terms of Use document available at the ISGS Web site, 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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