|
Section 1 | Identification Information - - - - - - top |
Originator | Minnesota DNR Waters - County Geologic Atlas and Regional Hydrogeologic Assessment Program |
Title | GWSLPY |
System Name | |
Abstract | Sensitivity to Pollution of the Uppermost Bedrock Aquifers |
Purpose | County Geologic Atlas and Regional Hydrogeologic Assessment Program,
Goodhue County Atlas, Part B, CGA-12 |
Time Period of Content Date | 8/21/00 |
Currentness Reference | Current |
Progress | Complete |
Maintenance and Update Frequency | None Planned |
Spatial Extent of Data | Goodhue County, Minnesota. |
Bounding Coordinates | East | 560,305 | West | 496,709 | North | 4,951,185 | South | 4,893,615 |
|
Place Keywords | Minnesota, Goodhue County |
Theme Keywords | Pollution sensitivity |
Theme Keyword Thesaurus | None |
Access Constraints | None |
Use Constraints | Users may wish to verify critical information; sources include both the references here and information on file in the offices of the Minnesota Geological Survey and the Department of Natural Resources. Every effort has been made to ensure the interpretation shown conforms to sound geologic and cartographic principles. This map should not be used to establish legal title, boundaries, or locations of improvements. |
Contact Person Information | See Metadata Reference Information section, below |
Browse Graphic File Name | |
Browse Graphic File Description | |
Associated Data Sets | None |
|
Section 2 | Data Quality Information - - - - - - top |
Attribute Accuracy | |
Logical Consistency | Data are topologically correct using ArcView 3.2 |
Completeness | Complete |
Horizontal Positional Accuracy | unknown |
Vertical Positional Accuracy | not applicable |
Lineage | The GIS components of the Sensitivity Map are examined separately in figure 3 of Plate 9. The Decorah-Platteville-Glenwood confining unit (Decorah Plateau outline) was extracted from the MGS ? BGNT coverage with the edge of the plateau represented by the lower contact of the Decorah Formation. The inner edge of the eroded portion of this confining was estimated with help from the Water Table Depth map on Plate 8. The shallow water table conditions were considered indicators of continuous confining unit conditions ? the deeper water table conditions were thought to represent the eroded edge (orange fringe of figure 3b).
The till thickness components shown in figures 3c and 3d were derived from the MGS ? DTLN coverage. These line files were converted to polygon files. The alluvium polygons from MGS coverage SPPG were subtracted spatially from the drift thickness polygons leaving a file that mostly represents till thickness. The till thickness file was separated into 5-50 foot ranges (shown on figure 3c) and greater than 50 foot ranges (shown of figure 3d). The thin till (5-50 foot) that overlapped the eroded edge of the Decorah-Platteville-Glenwood confining unit was colored yellow, the remainder was colored orange (figure 3c). The portion of the thick till (>50 feet)that covers the eroded edge was colored light green and the remainder was colored yellow. The sensitivity map was created by overlaying the components maps shown in figure 3 in reverse order.
Finally the outwash or colluvium and alluvium overlay coverages were derived from the MGS ? SGPG file.
Sensitivity interpretation was based on overlapping estimated time of travel ranges as follows:
Red - - Very High - - Hours to months
Orange - - High - - Weeks to years
Yellow - - Moderate - - Years to decades
Light green - - Low - - Decades to a century
Dark green - - Very Low - - A century or more
|
Source Scale Denominator | 100,000 |
|
Section 3 | Spatial Data Organization Information - - - - - - top |
Native Data Set Environment | ArcView 3.2 |
Geographic Reference for Tabular Data | Not Applicable |
Spatial Object Type | Vector |
Vendor Specific Object Types | Polygon |
Tiling Scheme | state |
|
Section 4 | Spatial Reference Information - - - - - - top |
Horizontal Coordinate Scheme | UTM |
Ellipsoid | GRS1980 |
Horizontal Datum | NAD83 |
Horizontal Units | meters |
Distance Resolution | meters |
Altitude Datum | n/a |
Altitude Units | n/a |
Depth Datum | n/a |
Depth Units | n/a |
Cell Width | 0 |
Cell Height | 0 |
Latitude Resolution | 0 |
Longitude Resolution | 0 |
UTM Zone Number | 15 |
SPCS Zone Identifier | 0 |
County Coordinate Zone Identifier | 0 |
Coordinate Offsets or Adjustments | n/a |
Map Projection Name | n/a |
Map Projection Parameters | n/a |
Other Coordinate System's Definition | n/a |
|
Section 5 | Entity and Attribute Information - - - - - - top |
Entity and Attribute Overview | |
Entity and Attribute Detailed Citation | |
