Des Plaines Watershed, IL/WI - TerraSource Orthorectified Imagery

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Frequently-anticipated questions:

What does this data set describe?

Title:
Des Plaines Watershed, IL/WI - TerraSource Orthorectified Imagery
Abstract:
Note: The original metadata file was written by ImageAmerica. The only entries by ISGS are those required for archival and access in the Survey's formal GIS, and Spatial_Data_Organization_Information, and Spatial_Reference_Information.

The Des Plaines images are one-foot resolution digital images which have been ortho-rectified to accuracy criteria required for use of the images at 1'=200' (1:2,400 scale). These black and white images cover approximately 450 square miles of the Des Plaines Watershed in southeastern Wisconsin and northeastern Illinois and were acquired during leaf-off vegetative conditions. The complete set of images and project index are distributed on 28 CDs. [ISGS note: and internally at ISGS and on the Illinois Natural Resources Geospatial Data Clearinghouse.]

Supplemental_Information:
Each set of CD's consists of image files (27 CDs) and an ArcView project index (1 CD). Most image CDs contain 10 image files. Each file is formatted in standard geotiff format. Tile boundaries and internal image pixels are oriented to the IL State Plane, East coordinate system. [ISGS note: NAD83] The extent of most image tiles is 8000 x 8000 US Survey feet. Image file names correspond to the State Plane coordinates of the southwest corner of the tile. These datasets have been validated for completeness and accuracy by the USGS. A test of the ortho-image positions against 29 ground check points produced RMSEs within the x and y tolerances of 3.1-feet (maximum RMSE for use at 1:2400 scale û 1"=200'). Final RMSE x = 2.67 feet. Final RMSE y = 2.08 feet.

  1. How should this data set be cited?

    ImageAmerica, 20001002, Des Plaines Watershed, IL/WI - TerraSource Orthorectified Imagery: ISGS GIS Database /<filename>.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -088.17
    East_Bounding_Coordinate: -087.75
    North_Bounding_Coordinate: 42.75
    South_Bounding_Coordinate: 41.80

  3. What does it look like?

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

    Beginning_Date: 25-Mar-2000
    Ending_Date: 26-Mar-2000
    Currentness_Reference: ground condition

  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 x varies, type Pixel

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

      Grid_Coordinate_System_Name: State Plane Coordinate System 1983
      State_Plane_Coordinate_System:
      SPCS_Zone_Identifier: 3776
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: .999975
      Longitude_of_Central_Meridian: -88.3333333334
      Latitude_of_Projection_Origin: 36.6666666667
      False_Easting: 984249.998999999
      False_Northing: 0.0

      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 1
      Ordinates (y-coordinates) are specified to the nearest 1
      Planar coordinates are specified in feet

      The horizontal datum used is North American Datum 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.257.

  7. How does the data set describe geographic features?

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?

    Kallen Bailey
    ImageAmerica
    18445 Edison Ave.
    Chesterfield, MO 63005
    USA

    636-530-1901 (voice)
    unknown (FAX)
    kbailey@image-america.com

Why was the data set created?

These ortho-images were created as a base for determining flood risk.

How was the data set created?

  1. From what previous works were the data drawn?

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

    Date: 02-Oct-2000 (process 1 of 1)
    Panoramic digital images were acquired from 17,500 feet above mean terrain using the Direct Digital Panoramic (DDP-1) camera. Onboard GPS and inertial navigation system data were used to derive camera position and attitude during data processing. Preprocessing, bore-site adjustment, and ortho-rectification were performed on the full project using automated processing in SocketSet photogrammetric software and proprietary software. Radiometric adjustments were applied to reduce brightness variations between images and to enhance image contrast.

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

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

  1. How well have the observations been checked?

  2. How accurate are the geographic locations?

  3. How accurate are the heights or depths?

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

    N/A

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

    N/A

How can someone get a copy of the data set?

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

Access_Constraints: None
Use_Constraints:
None. Acknowledgement of ImageAmerica would be appreciated in products derived from these data.

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

    Illinois State Geological Survey
    Information Office
    615 East Peabody Drive
    Champaign, Illinois 61820
    USA

    217-333-4747 (voice)
    217-244-0802 (FAX)
    isgs@isgs.uiuc.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?

    The Illinois Department of Natural Resources (DNR) provides these geographic data "as is." DNR makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. DNR further makes no warranties, either expressed or implied as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these data have been processed successfully on computers of DNR, no warranty, expressed or implied, is made by DNR regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such warranty.

    In no event shall the DNR have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of use of or reliance on the geographic data or arising out of the delivery, installation, operation, or support by DNR.

  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 28-Mar-2001
Metadata author:
ImageAmerica
18445 Edison Ave.
Chesterfield, MO 63005

636-530-1901 (voice)

Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

Illinois Natural Resources Geospatial Data Clearinghouse

Generated by mp version 2.8.11 on Mon Jan 29 15:19:30 2007