GWDPPY
Go to Section:- Overview
- Data Quality
- Data Organization
- Coordinate System
- Attributes
- Distribution - Get Data
- Metadata Reference
Section 1: Overview
Originator:Minnesota Department of Natural Resources
Title:
GWDPPY
Abstract:
Countywide modeled depth to water table
Purpose:
Blue Earth County Geologic Atlas, Part B, County Geologic Atlas Series C-26
Time Period of Content Date:
Currentness Reference:
data were acquired or accessed between 2011 and 2012
Progress:
Complete
Maintenance and Update Frequency:
None Planned
Spatial Extent of Data:
Blue Earth County, Minnesota
Bounding Coordinates:
-94.4
-93.8
44.3
43.8
Place Keywords:
Blue Earth County, Minnesota
Theme Keywords:
depth to water table
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 Minnesota 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:
Holly Johnson,
GIS Specialist
Minnesota Department of Natural Resources
500 Lafayette Rd
St. Paul,
MN
55155-4025
Phone: 651-259-5693
Email: holly.je.johnson@state.mn.us
Browse Graphic:
None available
Associated Data Sets:
Blue Earth County Geologic Atlas, Part A, County Geologic Atlas Series C-26, published by the Minnesota Geological Survey, 2012. More information and downloadable data for Part A is available on the MGS data site: http://www.mngs.umn.edu/county_atlas/countyatlas.htm
Section 2: Data Quality
Attribute Accuracy:
1:100,000
Logical Consistency:
Data are topologically correct using ArcGIS 10.2.2
Completeness:
Complete
Horizontal Positional Accuracy:
file was snapped to Part A raster btgd_be (bedrock topographic surface)
Vertical Positional Accuracy:
NA
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 LiDAR data generalized to 30-meter grid cells, and the elevation of large and small lakes from the same generalized LiDAR data. The river and lake 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 from the 30-meter DEM using LiDAR data. 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, with drainage enforcement option turned off, to create the water-table elevation model.
Collection of data from the field:
Field studies are conducted to measure static water level elevations in wells and chemistry of selected wells. These studies, combined with pre-existing data, are used to create models of water-table and bedrock hydrogeology (elevation, potentiometric surface, flow direction), and sensitivity of groundwater system to pollution.
Creation of GIS layers:
Using a variety of techniques, data are converted into ArcGIS shapefiles, grids, or feature classes for cartographic display and spatial analysis. Available water table elevation data, mostly from drillers logs and National Resource Conservation Service (NRCS) soil survey information, are interpolated using ArcMap 10.2 topo to raster tool with no drainage enforcement. The resulting elevation surface grid is then subtracted from the land surface grid to obtain a water table depth map.
Section 3: Spatial Data Organization (not used in this metadata)
Section 4: Coordinate System
Horizontal Coordinate Scheme:
Universal Transverse Mercator
UTM Zone Number:
15
Horizontal Datum:
NAD83
Horizontal Units:
meters
Vertical Datum:
Vertical Units:
Depth Datum:
Depth Units:
Section 5: Attributes
Overview:
Detailed Citation:
Table Detail:
GWDPPY - Depth to water tableField Name | Valid Values | Definition | Definition Source |
---|
DEPTH | - | representing modeled depth to water table in feet below land surface:
0 to 10,
>10 to 20,
>20 to 30,
>30 to 40,
>40 to 50,
>50 | |
Section 6: Distribution
Publisher:
Minnesota Department of Natural Resources, Ecological and Water Resources Division
Publication Date:
05/02/2016
Contact Person Information:
Holly Johnson,
GIS Specialist
Minnesota Department of Natural Resources
500 Lafayette Rd
St. Paul,
MN
55155-4025
Phone: 651-259-5693
Email: holly.je.johnson@state.mn.us
Distributor's Data Set Identifier:
GWDPPY
Distribution Liability:
These data were prepared from publicly available information only. Every reasonable effort has been made to ensure the accuracy of the factual data on which these files are 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.
Online Linkage:
None available
Section 7: Metadata Reference
Metadata Date:
05/02/2016
Contact Person Information:
Holly Johnson,
GIS Specialist
Minnesota Department of Natural Resources
500 Lafayette Rd
St. Paul,
MN
55155-4025
Phone: 651-259-5693
Email: holly.je.johnson@state.mn.us
Metadata Standard Name:
Minnesota Geographic Metadata Guidelines
Metadata Standard Version:
1.2