(1) vector spatial data layers in ArcView data format for drift thickness polygons and contours;
(2) JPEG browse images from the final published map, and
(3) metadata in FGDC compliant format for all spatial layers.
The vector data include maximum and minimum thicknesses of drift polygons, contour thickness values and a line-type indicator.
Vector data are in the geographic coordinate system, decimal degrees, NAD83.
For a detailed list of the files included in the data product, see the Supplemental_Information section.
The data were published in 1999 on an ISGS Illinois Geologic Quadrangle entitled Drift Thickness Map, Villa Grove Quadrangle, Douglas County, Illinois by C. Pius Weibel and Curtis C. Abert. The data in this compilation do not include all the information on the published map. Refer to the published map for a complete explanation of the Drift Thickness of the Villa Grove Quadrangle.
The nominal scale is 1:24,000.
Detailed List Of Files included in the product ---------------------------------------------- Folder Filename Size(kb) Filetype Description ----------------- -------------- -------- --------------------------------------------- ------------------------------------------------------ dp00010 drift_ln.dbf 25 shapefile dBase component contour boundaries - map boundaries dp00010 drift_ln.prj 1 shapefile projection component contour boundaries - map boundaries dp00010 drift_ln.shp 506 shapefile contour boundaries - map boundaries dp00010 drift_ln.shx 2 shapefile component contour boundaries - map boundaries dp00010 drift_py.dbf 10 shapefile dBase component drift thickness units dp00010 drift_py.prj 1 shapefile projection component drift thickness units dp00010 drift_py.shp 987 shapefile drift thickness units dp00010 drift_py.shx 1 shapefile component drift thickness units dp00010 readme.htm 14 ASCII text imbedded in HTML describes this data bundle Folder Filename Size(kb) Filetype Description ----------------- -------------- -------- --------------------------------------------- ------------------------------------------------------------- dp00010/images browse_l.jpg 225 JPEG/JFIF image reduced resolution image of the complete map sheet dp00010/images browse_m.jpg 211 JPEG/JFIF image reduced resolution image of the mapped quad as it appears on the published map dp00010/images browse_s.jpg 5 JPEG/JFIF image small browse graphic dp00010/images locmap.jpg 56 JPEG/JFIF image location map from published map Folder Filename Size(kb) Filetype Description ----------------- -------------- -------- --------------------------------------------- ------------------------------------------------------------- dp00010/metadata dp00010s.htm 22 metadata in FGDC HTML outline format overall metadata document to describe this data bundle dp00010/metadata dp00010sf.htm 22 metadata in FGDC HTML FAQ format overall metadata document to describe this data bundle dp00010/metadata drift.htm 17 metadata in FGDC HTML outline format drift thickness and contours metadata
Any hardcopies utilizing DNR data sets shall clearly indicate their source. If the licensee has modified the data in any way they are obligated to describe the types of modifications they have performed on the hardcopy map. Licensee specifically agrees not to misrepresent DNR data sets, nor to imply that changes they made were approved by DNR.
These data are not to be used for commercial profit.
These data should not be used at scales greater than 1:24,000.
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.
It is assumed that those who wish to download, unzip and use these data are technically proficient in using the Internet, file zipping software, and GIS software. The ISGS will entertain questions about the data, but will not provide support of any kind in regard to the use of the Internet or any particular software package.