(1) vector spatial data layers in ArcView data formats for bedrock topography polygons and contours, and data points for stratigraphic test cores, water wells, petroleum borings and coal borings;
(2) JPEG browse images from the final published map, and
(3) metadata in FGDC compliant format for all spatial layers.
The vector data include elevation contours of the bedrock surface 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 Topographic Map of Bedrock Surface, Villa Grove Quadrangle, Douglas County, Illinois by C. Pius Weibel. 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 Bedrock Topography of the Villa Grove Quadrangle.
The nominal scale is 1:24,000.
Folder Filename Size(kb) Filetype Description ----------------- -------------- -------- --------------------------------------------- ------------------------------------------------------ dp00009 bdtpo_ln.dbf 3 shapefile dBase component contours - map boundaries dp00009 bdtpo_ln.prj 1 shapefile projection component contours - map boundaries dp00009 bdtpo_ln.shp 52 shapefile contours - map boundaries dp00009 bdtpo_ln.shx 1 shapefile component contours - map boundaries dp00009 bdtpo_py.dbf 1 shapefile dBase component bedrock topography polygons dp00009 bdtpo_py.prj 1 shapefile projection component bedrock topography polygons dp00009 bdtpo_py.shp 93 shapefile bedrock topography polygons dp00009 bdtpo_py.shx 1 shapefile component bedrock topography polygons dp00009 data_pt.dbf 2 shapefile dBase component data points dp00009 data_pt.prj 1 shapefile projection component data points dp00009 data_pt.shp 4 shapefile data points dp00009 data_pt.shx 2 shapefile component data points dp00009 readme.htm 14 ASCII text imbedded in HTML describes this data bundle Folder Filename Size(kb) Filetype Description ----------------- -------------- -------- --------------------------------------------- ------------------------------------------------------------- dp00009/images browse_l.jpg 211 JPEG/JFIF image reduced resolution image of the complete map sheet dp00009/images browse_m.jpg 195 JPEG/JFIF image reduced resolution image of the mapped quad as it appears on the published map dp00009/images browse_s.jpg 5 JPEG/JFIF image small browse graphic dp00009/images locmap.jpg 56 JPEG/JFIF image location map from published map Folder Filename Size(kb) Filetype Description ----------------- -------------- -------- --------------------------------------------- ------------------------------------------------------------- dp00009/metadata bdtpo.htm 17 metadata in FGDC HTML outline format bedrock topography units and contour boundaries metadata dp00009/metadata data_pt.htm 16 metadata in FGDC text outline format data point metadata dp00009/metadata dp00009.htm 23 metadata in FGDC HTML outline format overall metadata document to describe this data bundle dp00009/metadata dp00009f.htm 23 metadata in FGDC HTML FAQ format overall metadata document to describe this data bundle
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.