# gwdppy

This page last updated: 03/25/2019
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: Modeled depth to water table in Washington County, Minnesota
Purpose: Washington County Geologic Atlas, Part B
Time Period of Content Date:
Currentness Reference: Data were obtained in 2015 and re-evaluated in January 2016.
Progress: Complete
Maintenance and Update Frequency: None Planned
Spatial Extent of Data: Washington County, Minnesota
Bounding Coordinates: -93.23
-92.74
45.3
44.75
Place Keywords: Washington 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: Washington County Geologic Atlas, Part A, published by the Minnesota Geological Survey (MGS). More information and downloadable data for Part A available on the MGS 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 10.6
Completeness: Complete
Horizontal Positional Accuracy: File was snapped to statewide 30 meter LiDAR data.
Vertical Positional Accuracy: NA
Lineage: The depth to water table raster was created by subtracting the water-table elevation raster model from the 30-meter DEM derived using LiDAR data.
Water-table information was derived from the following datasets:
- NRCS soil survey tabular and spatial data, using the minimum annual depth to water table values for non-perched wet soil polygons. A grid of points spaced 100 meters apart was established over the wet soil polygons. The depth to water table values from each polygon were extracted to this grid of points across the state. The water-table elevation value for each point was equal to the 30-meter DEM derived using LiDAR data value minus the minimum annual water table depth.
- National Wetlands Inventory Circular 39 Classification, 2009-2015, using features for which water regimes = C, F, G, and H. National Wetland Inventory features with an area greater than one acre were given points spaced 100 meters apart around the perimeter of the feature. Water features with an area less than one acre were given a centroid. The water-table elevation value for each point was obtained from the 30-meter DEM derived using LiDAR data.
- Stream Routes with Stream Types, using features for which strm_type_desc = Centerline (River), Drainage Ditch (Perennial), or Stream (Perennial). The streams were converted to points spaced 100 meters apart along each feature. The water-table elevation value for each point was obtained from the 30-meter DEM derived using LiDAR data.
- Minnesota County Well Index (Verified Locations), using features for which Aquifer = QWTA. The water-table elevation value for each point was equal to the 30-meter DEM derived using LiDAR data value minus the static water level depth.
The points were merged into one feature class and the Topo to Raster tool was run on the feature class to generate the water-table elevation model; drainage was not enforced.

## 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
Field Name | Valid Values | Definition | Definition Source
--- | --- | --- | ---
DEPTH | - | Modeled depth to water table in feet below land surface |

## Section 6: Distribution

Publisher: Minnesota Department of Natural Resources, Ecological and Water Resources Division
Publication Date: 03/25/2019
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 Department of Natural Resources.
Ordering Instructions: Download zip file of metadata and feature classes by clicking "I AGREE" below.
PDFs of the County Geologic Atlas plates can be downloaded at: http://www.dnr.state.mn.us/waters/groundwater_section/mapping/status.html
Online Linkage: I AGREE to the notice in "Distribution Liability" above. Clicking to agree will either begin the download process, link to a service, or provide more instructions. See "Ordering Instructions" above for details.

## Section 7: Metadata Reference

Metadata Date: 03/25/2019
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
Metadata Standard Online Linkage: http://www.mngeo.state.mn.us/committee/standards/mgmg/metadata.htm

This page last updated: 03/25/2019
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