Dataset Identification:
Resource Abstract:
- description: This geodatabase includes spatial datasets that represent the Silurian-Devonian aquifers in the States of Illinois,
Indiana, Iowa, Kentucky, Michigan, Missouri, Ohio, Tennessee, and Wisconsin. Included are: (1) polygon extents; datasets that
represent the aquifer system extent, and the entire extent subdivided into subareas, (2) raster datasets for the altitude
of the top and bottom surfaces of the entire aquifer (where data are available), and (3) altitude contours used to generate
the surface rasters. The digitized contours are supplied for reference. The extent of the Silurian-Devonian aquifers is from
the linework of the Silurian-Devonian aquifer extent maps in U.S. Geological Survey U.S. Geological Survey Hydrologic Atlas
730, Chapters J and K, (USGS HA 730-J, -K) and a digital version of the aquifer extent presented in the National Aquifer Code
Reference List, available at http://water.usgs.gov/ogw/NatlAqCode-reflist.html , "silurian.zip". The extent was
then modified for each subarea: Subarea 1 (sa1): Primarily in Ohio and Indiana, subject of U.S. Geological Survey Professional
Paper 1423 B (USGS PP 1423B). Subarea 2 (sa2): In Iowa. Digital data were available from the Iowa Geologic Survey. Subarea
3 (sa3): Remaining area in Illinois, Wisconsin, Michigan, and Kentucky. Extent is that part of the National Aquifer Code Reference
List polygon that remained when the areas of sa1 and sa2 were removed. The altitude and thickness contours that were available
for each subarea were compiled or generated from georeferenced figures of altitude contours in USGS PP 1423B for sa1, digital
data from IAGS for sa2. There were no vertical data for sa3. The resultant top and bottom altitude values were interpolated
into surface rasters within a GIS using tools that create hydrologically correct surfaces from contour data, derive the altitude
from the thickness (depth from the land surface), and merge the subareas into a single surface. The primary tool was an enhanced
version of "Topo to Raster" used in ArcGIS, ArcMap, Esri 2014. The raster surfaces were corrected in the areas where
the altitude of an underlying layer of the aquifer exceeded the altitude of an overlying layer.; abstract: This geodatabase
includes spatial datasets that represent the Silurian-Devonian aquifers in the States of Illinois, Indiana, Iowa, Kentucky,
Michigan, Missouri, Ohio, Tennessee, and Wisconsin. Included are: (1) polygon extents; datasets that represent the aquifer
system extent, and the entire extent subdivided into subareas, (2) raster datasets for the altitude of the top and bottom
surfaces of the entire aquifer (where data are available), and (3) altitude contours used to generate the surface rasters.
The digitized contours are supplied for reference. The extent of the Silurian-Devonian aquifers is from the linework of the
Silurian-Devonian aquifer extent maps in U.S. Geological Survey U.S. Geological Survey Hydrologic Atlas 730, Chapters J and
K, (USGS HA 730-J, -K) and a digital version of the aquifer extent presented in the National Aquifer Code Reference List,
available at http://water.usgs.gov/ogw/NatlAqCode-reflist.html , "silurian.zip". The extent was then modified for
each subarea: Subarea 1 (sa1): Primarily in Ohio and Indiana, subject of U.S. Geological Survey Professional Paper 1423 B
(USGS PP 1423B). Subarea 2 (sa2): In Iowa. Digital data were available from the Iowa Geologic Survey. Subarea 3 (sa3): Remaining
area in Illinois, Wisconsin, Michigan, and Kentucky. Extent is that part of the National Aquifer Code Reference List polygon
that remained when the areas of sa1 and sa2 were removed. The altitude and thickness contours that were available for each
subarea were compiled or generated from georeferenced figures of altitude contours in USGS PP 1423B for sa1, digital data
from IAGS for sa2. There were no vertical data for sa3. The resultant top and bottom altitude values were interpolated into
surface rasters within a GIS using tools that create hydrologically correct surfaces from contour data, derive the altitude
from the thickness (depth from the land surface), and merge the subareas into a single surface. The primary tool was an enhanced
version of "Topo to Raster" used in ArcGIS, ArcMap, Esri 2014. The raster surfaces were corrected in the areas where
the altitude of an underlying layer of the aquifer exceeded the altitude of an overlying layer.
Citation
- Title Geodatabase of the datasets that represent the three subareas of the Silurian-Devonian aquifer, Illinois, Indiana, Iowa, Kentucky,
Michigan, Missouri, Ohio, Tennessee, and Wisconsin.
-
- creation Date
2018-06-08T04:32:17.409144
Resource language:
Processing environment:
Back to top:
Metadata data stamp:
2018-08-06T20:54:17Z
Resource Maintenance Information
- maintenance or update frequency:
- notes: This metadata record was generated by an xslt transformation from a dc metadata record; Transform by Stephen M. Richard, based
on a transform by Damian Ulbricht. Run on 2018-08-06T20:54:17Z
Metadata contact
-
pointOfContact
- organisation Name
CINERGI Metadata catalog
-
- Contact information
-
-
- Address
-
- electronic Mail Address cinergi@sdsc.edu
Metadata language
eng
Metadata character set encoding:
utf8
Metadata standard for this record:
ISO 19139 Geographic Information - Metadata - Implementation Specification
standard version:
2007
Metadata record identifier:
urn:dciso:metadataabout:321322b4-070f-4aee-a2b5-299a776eddd0
Metadata record format is ISO19139 XML (MD_Metadata)