Metadata: GWDPPY

GWDPPY

This page last updated: 05/02/2016
Metadata created using Minnesota Geographic Metadata Guidelines


Go to Section:
  1. Overview
  2. Data Quality
  3. Data Organization
  4. Coordinate System
  5. Attributes
  6. Distribution - Get Data
  7. 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 table
Field NameValid ValuesDefinitionDefinition 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.

Ordering Instructions: Download zip file of metadata and feature classes by clicking "I AGREE" below.

PDFs of the Blue Earth County Geologic Atlas can be downloaded at: http://www.dnr.state.mn.us/waters/programs/gw_section/mapping/platesum/bluecga.html

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



This page last updated: 05/02/2016
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