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Section 1 | Identification Information - - - - - - top |
Originator | Minnesota DNR Waters - County Geologic Atlas and Regional Hydrogeologic Assessment Program |
Title | GWELPY |
System Name | |
Abstract | Countywide modeled water-table elevation. This shapefile includes an estimate of the water table elevation in the surficial sand aquifer and in non-aquifer sediments. Because of much better data in the surficial sand aquifer, the model of water-table elevation is more accurate than the estimate in non-aquifer material. |
Purpose | County Geologic Atlas and Regional Hydrogeologic Assessment Program,
Todd County Geologic Atlas, Part B, County Geologic Atlas Series C-18 |
Time Period of Content Date | November, 2010 |
Currentness Reference | Publication date |
Progress | Complete |
Maintenance and Update Frequency | None Planned |
Spatial Extent of Data | Todd County, Minnesota |
Bounding Coordinates | East | -94.6 | West | -95.2 | North | 46.4 | South | 45.8 |
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Place Keywords | Minnesota, Todd County |
Theme Keywords | water table elevation |
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 | Todd County Geologic Atlas, Part A, County Geologic Atlas Series C-18, published by the Minnesota Geological Survey, 2007. More information and downloadable data for Part A available on the MGS ftp site. |
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Section 2 | Data Quality Information - - - - - - top |
Attribute Accuracy | |
Logical Consistency | Data are topologically correct using ArcGIS 9.3 |
Completeness | Complete |
Horizontal Positional Accuracy | unknown |
Vertical Positional Accuracy | not applicable |
Lineage | The water-table elevation was estimated from several sources of data including water levels in wells constructed in the surficial sand aquifer; the elevation of rivers and perennial streams from a hydrologically-corrected Digital Elevation Model (DEM) constructed by DNR Waters for mapping surface watersheds; and the elevation of large and small lakes from the same DEM. To account for water-table elevation changes between the top of drumlins and the intervening swales, it was assumed that the water table on the top of drumlins was ten feet below land surface. Between drumlins, wet soils and shallow lakes indicate that the water table is close to the land surface. Those data were supplemented with Natural Resources Conservation Service (NRCS) polygon shapefiles of soils and associated tabular data that estimate the depth to water table for wet soils. A 100-meter grid of points was established over wet soil polygons; estimates of depth to water for each point were sampled from each relevant soil polygon and surface elevations were determined by sampling the hydrologically-corrected DEM. The water-table elevation at each point was calculated by subtracting the depth to water from the surface elevation. All of the above data were converted to sample points and interpolated with the ArcGIS Topo to Raster tool to create the water table elevation model. |
Source Scale Denominator | 100000 |
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Section 3 | Spatial Data Organization Information - - - - - - top |
Native Data Set Environment | ArcGIS 9.3 |
Geographic Reference for Tabular Data | Not Applicable |
Spatial Object Type | Vector |
Vendor Specific Object Types | polygon |
Tiling Scheme | state |
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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 |
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Section 5 | Entity and Attribute Information - - - - - - top |
Entity and Attribute Overview | |
Entity and Attribute Detailed Citation HTML Table (Not Available) | GWELPY | | | | Elevation
(representing modeled water table elevation in feet above sea level) | 1150-1175
1175-1200
1200-1225
1225-1250
1250-1275
1275-1300
1300-1325
1325-1350
1350-1375
1375-1400
1400-1425
1425-1450
1450-1475
1475-1500
1500-1525 |
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Section 6 | Distribution Information - - - - - - top |
Publisher | Minnesota DNR Waters |
Publication Date | 2010 |
Contact Person Information | See Metadata Reference Information section, below |
Distributor's Data Set Identifier | GWELPY |
Distribution Liability | This map was prepared from publicly available information only. Every reasonable effort has been made to ensure the accuracy of the factual data on which this map is based. However, the Department of Natural Resources does not warrant the accuracy, completeness, or any implied uses of these data. 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. |
Transfer Format Name | shapefile |
Transfer Format Version Number | |
Transfer Size | |
Ordering Instructions | Download ArcGIS shapefiles from:
Todd County Geologic Atlas, Part B: Metadata for GIS and Digital Data |
Online Linkage | Todd County Geologic Atlas, Part B: Metadata for GIS and Digital Data |
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Section 7 | Metadata Reference Information - - - - - - top |
Metadata Date | 2011-01-03 |
Contact Person Information | GIS Specialist, Atlas/Assessment Program
Minnesota DNR - Division of Waters
500 Lafayette Road
Saint Paul, MN 55155
Phone: (651) 259-5693
FAX: (651) 296-0445
E-mail: |
Metadata Standard Name | Minnesota Geographic Metadata Guidelines |
Metadata Standard Version | 1.2 |
Metadata Standard Online Linkage | http://www.lmic.state.mn.us/gc/stds/metadata.htm |
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