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Section 1 | Identification Information |
Originator | Minnesota DNR Division of Ecological and Water Resources - County Geologic Atlas and Regional Hydrogeologic Assessment Program |
Title | SDTHPY |
System Name | |
Abstract | Modeled surficial sand and gravel thickness in Benton County, Minnesota |
Purpose | County Geologic Atlas and Regional Hydrogeologic Assessment Program,
Benton County Geologic Atlas, Part B, County Geologic Atlas Series C-23 |
Time Period of Content Date | August, 2011 |
Currentness Reference | Publication date |
Progress | Complete |
Maintenance and Update Frequency | None Planned |
Spatial Extent of Data | Benton County, Minnesota |
Bounding Coordinates | East | -93.8 | West | -94.4 | North | 45.8 | South | 45.6 |
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Place Keywords | Minnesota, Benton County |
Theme Keywords | surficial sand and gravel thickness |
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 | Benton County Geologic Atlas, Part A, County Geologic Atlas Series C-23, published by the Minnesota Geological Survey, 2010. More information and downloadable data for Part A available on the MGS data site. |
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Section 2 | Data Quality Information |
Attribute Accuracy | |
Logical Consistency | Data are topologically correct using ArcGIS 10.0 |
Completeness | Complete |
Horizontal Positional Accuracy | unknown |
Vertical Positional Accuracy | not applicable |
Lineage | The primary data used to construct this file was derived from well logs in the County Well Index (CWI) database managed by the Minnesota Department of Health and the Minnesota Geological Survey (MGS) with verified locations. Using a custom ArcGIS extension (DNR Groundwater Tools, generate well stick diagrams) 32 west-east geologic cross sections were created with modified versions of the Minnesota Geological Survey shapefile (stratln.shp) showing the base of the surficial sand. Using another custom DNR extension (DNR Groundwater Tools, generate XYZ points from profile lines) the vertices of the shapefile lines were converted to point shapefiles that also have elevation above mean sea level (MSL) as an attribute. To create this file the points that defined the base of the surficial sand layer were selected to create part of the dataset that was interpolated into a grid file that represents the bottom of the surficial sand. A second point file was created to represent the land surface elevation around the edge of the surficial sand. This file was created by selecting the surficial sand polygons from the MGS surficial geology file, dissolving the boundaries between the polygons, and creating a file with points at 100 meter intervals along the boundaries of the surface sand with ArcGIS. Surface elevation values from a land surface DEM were added to the point records as an elevation field using ArcGIS. These two point shape files were merged. The resulting point file was interpolated using a spline tension method with default parameters in Arc GIS. The resulting grid elevation file was subtracted from the land surface DEM to produce a thickness grid file of the surficial sand. The final raster was converted to a polygon shapefile. |
Source Scale Denominator | 100000 |
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Section 3 | Spatial Data Organization Information |
Native Data Set Environment | ArcGIS 10.0 |
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 |
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 |
Entity and Attribute Overview | |
Entity and Attribute Detailed Citation HTML Table (Not Available) | SDTHPY | | | | Thickness
(representing modeled surficial sand and gravel thickness in feet) | 0-25
>25-50
>50-75
>75 |
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Section 6 | Distribution Information |
Publisher | Minnesota DNR Division of Ecological and Water Resources |
Publication Date | 2012 |
Contact Person Information | See Metadata Reference Information section, below |
Distributor's Data Set Identifier | SDTHPY |
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:
Benton County Geologic Atlas, Part B: Metadata for GIS and Digital Data |
Online Linkage | Benton County Geologic Atlas, Part B: Metadata for GIS and Digital Data |
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Section 7 | Metadata Reference Information |
Metadata Date | 2012-09-11 |
Contact Person Information | GIS Specialist, Atlas/Assessment Program
Minnesota DNR - Division of Ecological and Water Resources
500 Lafayette Road
Saint Paul, MN 55155
Phone: (651) 259-5693 or (651) 259-5700
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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