Donald Luman Lisa Smith Chris Goldsmith 2003 20060927 raster digital data ISGS GIS Database GISDB.IL_DEM_SHADED_RELIEF_30M_RAS Champaign, IL Illinois State Geological Survey http://www.isgs.illinois.edu/ http://illinois.edu Donald Luman Lisa Smith Chris Goldsmith 2003 map Illinois Map 11 Champaign, Illinois, USA Illinois State Geological Survey Scale, 1:500,000. Size, 36 x 54 inches. Color. 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. 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. 20011018 Last update with updated USGS DEM data Complete None planned -91.5336 -87.2490 42.6108 36.8568 None DEM digital elevation model elevation 30-meter shaded relief landform U.S. Department of Commerce, 1977, Countries, dependencies,areas of special sovereignty, and their principal administrative divisions (Federal Information Processing Standard 10-3): Washington, D.C., National Institute of Standards and Technology. IL 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. 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. Please refer to the Distribution Information section. ArcSDE 9.1 on Oracle 10g http://www.isgs.illinois.edu http://www.vpaa.uillinois.edu/policies/web_privacy.cfm http://www.uillinois.edu/trustees/rules.cfm#sec34 http://www.fs.uiuc.edu/cam/CAM/viii/viii-1.1.html None. None. None. Should be consistant for NMAS specification for a 1:24000 scale map. Half the contour interval of the original USGS topographic survey. A typical interval for Illinois is ten feet although other ranges exist. 24000 Imported USGS DEMs to ESRI GRID lattices. 2001 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. 2001 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. 2001 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. 2001 09210800 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. 20031217 Raster Pixel 21661 12665 1 Universal Transverse Mercator 16 0.999600 -87.000000 0.000000 500000.000000 0.000000 row and column 30.000000 30.000000 meters North American Datum of 1927 Clarke 1866 6378206.400000 294.978698 Band_1 ObjectID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Value Count Information Office, Illinois State Geological Survey (ISGS), a division of the Institute of Natural Resource Sustainability (INRS) of the University of Illinois mailing and physical address

615 East Peabody Drive

Champaign Illinois 61820 USA 217-333-4747 217-785-0211 isgs@isgs.illinois.edu 8:00 a.m. - 4:30 p.m., Monday-Friday, U.S. Central Time 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. 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. 20090224 Please refer to the Distribution Information section. FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time The access constraints as stated for the data apply also to the metadata. Refer to the Access Constraints section of the Identification Information section. The use constraints as stated for the data apply also to the metadata. Refer to the Use Constraints section of the Identification Information section. http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile