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Title:Countywide Vertical Datum Conversion Factors in Illinois
Author(s):Illinois State Water Survey
Contributor(s):Graff, Phillip; Li, Jane
Subject(s):vertical datum
conversion factors
Illinois
Geographic Coverage:Illinois
Abstract:Countywide Vertical Datum Conversion Factors in Illinois - This map displays countywide, conversion values to adjust elevations from the National Geodetic Vertical Datum 1929 (NGVD 29) to the North American Vertical Datum 1988 (NAVD 88). Values indicated should be added to current NGVD 29 elevations (not displayed) to obtain the NAVD 88 elevation. Countywide values were calculated using the methodology outlined in the Federal Emergency Management Agency (FEMA) Guidelines and Specifications for Flood Hazard Mapping Partners Appendix B. Point conversion factors were computed using the CORPSCON utility. This map is available online as a 11" x 17" PDF file (450k).
Issue Date:2007
Series/Report:ISWS Map Series MS2007-01
Genre:Other
Type:image
Language:English
URI:http://hdl.handle.net/2142/100387
Date Available in IDEALS:2018-08-09


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