The data are not appropriate as a geodetic, legal or engineering base. The data set was not and is not intended as a substitute for surveyed locations, such as can be determined by a registered Public Land Surveyor. Although useful in a GIS as a reference base layer for maps, the data set has no legal basis in the definition of boundaries or property lines.
Recent updates to the data:
In April 2004 edition 1.0 of the data set was transitioned to storage in an Oracle RDBMS using the ArcSDE geodatabase model. The result (this version) is designated Edition 20040423.
Links to these are 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, firstname.lastname@example.org. License fees and a license agreement may be required, depending on the proposed usage.
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.
In alluvial areas, soil unit boundaries were adjusted to corresponding Quaternary geology or Stack-unit delineations. Where alluvial soil units could be verified on the Landsat scene, they were extended up drainages for a maximum of an additional 0.5 inch. Further extension would have deviated too much from the original map. When soil units meandered back and forth along drainages, they were redrafted to fit the topography and landforms. Soil units located outside of alluvial areas were not integrated unless sliver polygons were created. In order to resolve sliver polygons, the lines created from either the Quaternary geology or STACK unit maps were considered more definitive. Soil units were not changed where they extended into mined-out areas shown on either the Stack-unit or Quaternary geology maps.
The features were imported into the ISGS SDE enterprise database following steps outlined in ISGS procedure GISDB_0009.
SOIL-ASC - Combined parent material (P) amd Soil association (S) codes as tabulated below
P - Soil parent material 01 - Thick loess (>60 inches) 02 - Moderately thick to thin loess (10-60+ inches) on Illinoian drift with or without paleosols 03 - Moderately thick to thin loess (20-60 inches) on Aeolian Wisconsinan loamy sands or sands 04 - Moderately thick loess (40-60 inches) on medium-to-fine-textured, Wisconsinan till or lacustrine sediments 05 - Moderately thick to thin loess or silty material (24-60+ inches) on medium-textured, Wisconsinan outwash 06 - Thin loess (10-40 inches) on loam or sandy loam, Wisconsinan till 07 - Thin loess (<20 inches) on silty clay loam, Wisconsinan till, or lacustrine sediments 08 - Thin loess (<20 inches) on silty clay or clay, Wisconsinan till, or lacustrine sediments 09 - Loamy, silty, and clayey Wisconsinan lacustrine sediments 10 - Thin loamy or silty materials on gravelly Wisconsinan outwash 11 - Thin silty or loamy materials on sandy and loamy Wisconsinan outwash 12 - Thick, sandy Wisconsinan outwash and Aeolian materials 13 - Thin to thick loess or loamy materials with or without residuum on limestone 14 - Thin to thick loess or loamy materials with or without residuum on interbedded sandstone, siltstone, and shale 15 - Sandy to clayey alluvial sediments on bottomlands 16 - Organic materials (peats and mucks) 98 - Water
S - Soil association Dark and Moderately Dark (Prairie) 01 - Port Byron-Joy 02 - Tama-Muscatine-Sable 03 - Tama-Ipava-Sable 04 - Herrick-Virden-Piasa 05 - Oconee-Cowden-Piasa 06 - Hoyleton-Cisne-Huey 07 - Winnebago-Durand-Ogle 08 - Broadwell-Waukegan-Pillot 09 - Catlin-Flanagan-Drummer 10 - Wenona-Rutland-Streator 11 - Plano-Proctor-Worthen 12 - Saybrook-Dana-Drummer 13 - Griswold-Ringwood 14 - Varna-Elliott-Ashkum 15 - Symerton-Andres-Reddick 16 - Swygert-Bryce-Mokena 17 - Clarence-Rowe 18 - Harco-Patton-Montgomery 19 - Martinton-Milford 20 - Lorenzo-Warsaw-Wea 21 - Jasper-LaHogue-Selma 22 - Sparta-Dickinson-Onarga 23 - Channahon-Dodgeville-Ashdale 24 - Lawson-Sawmill-Darwin 25 - Houghton-Palms-Muskego
Light and Moderately Dark (Forest) 31 - Seaton-Timula 32 - Fayette-Rozetta-Stronghur 33 - Alford-Muren-Iva 34 - Clinton-Keomah-Rushville 35 - Hosmer-Stoy-Weir 36 - Ava-Bluford-Wynoose 37 - Westville-Pecatonica-Flagg 38 - Middletown-Tell-Thebes 39 - Birkbeck-Sabina-Sunbury 41 - St. Charles-Camden-Drury 42 - Dodge-Russell-Miami 43 - Kidder-McHenry 44 - Morley-Blount-Beecher 45 - St. Clair-Nappanee-Frank 46 - Markland-Colp-Del Rey 48 - Casco-Fox-Ockley 49 - Martinsville-Sciotoville 50 - Oakville-Lamont-Alvin 51 - Ritchey-New Glarus-Palsgrove 52 - Alford-Goss Baxter 53 - Alford-Wellston 54 - Hosmer-Zanesville-Berks 55 - Grantsburg-Zansville-Wellston 56 - Derinda-Schapville-Elroy 57 - Haymond-Petrolia-Karnak 98 - Water
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Illinois Natural Resources Geospatial Data ClearinghouseGenerated by mp version 2.8.25 on Thu Apr 02 09:54:12 2009