Rice County Geologic Atlas, Part B

GWSL2PY metadata

Minnesota Geographic Metadata Guidelines  - Metadata Entry Template

Version 1.0.4 - July 1, 1997

A State Version of the FGDC Content Standards for Geospatial Metadata

Description of data that was created for The Rice County Geologic Atlas
by DNR Waters
County Geologic Atlas and Regional Hydrogeologic Assessment Program

Data Set Name: GWSL2PY

Metadata Entered By: Randy McGregor

Date: 6/9/98

Section 1Identification Information
OriginatorMoira Campion
Minnesota Clearinghouse ID 
AbstractSensitivity of the water table to pollution
PurposeCounty Geologic Atlas Program: Atlas C-9 Part B, Plate 9 Pollution Sensitivity
Time Period of Content Date1993 - 1997
Currentness Reference 
Maintenance and Update FrequencyNone Planned
Spatial Extent of DataRice County, Minnesota
West Bounding Coordinate458,001 
East Bounding Coordinate496,882 
North Bounding Coordinate4,932,388 
South Bounding Coordinate4,893,695 
Place KeywordsRice County, Minnesota
Theme KeywordsPollution Sensitivity, Water Table, Aquifers
Theme Keyword Thesaurus 
Access ConstraintsNone
Use ConstraintsNone
Contact PersonMoira Campion
Contact OrganizationMinnesota Department of Natural Resources, Division of Waters
Contact Person PositionHydrogeologist
Contact Address500 Lafayette Road
Contact CitySt. Paul
Contact State or ProvinceMinnesota
Contact Postal Code55155 - 4032
Contact Voice Phone(651) 259-5661
Contact Fax Phone(651) 296-0445
Contact E-mail Address[email protected]
Browse Graphic File Name 
Browse Graphic File Description 
Associated Data SetsAtlas C-9 Part A, produced by the Minnesota Geological Survey

Section 2Data Quality Information
Attribute Accuracy 
Logical ConsistencyData are topologically correct using ARC/INFO 7.1.1.
Horizontal Positional AccuracyN.A.
Vertical Positional AccuracyN.A.
LineageNOTE: This is a very complex coverage. A thorough explanation of its compilation is provided at the end of this document.

In short, sensitivity ratings are derived as follows:

Very High

  • ?Less than 50 ft to bedrock
  • ?Subset of MGS' surficial geology coverage where mgscode = 443002,443006,443102,443521,443527,443528 (alluvium or outwash designations) 
  • ?Subset of MGS' surficial geology coverage where mgscode = 443001 (organic deposits) and located close to or within alluvial/outwash deposits 
  • ?Selected wetlands from the National Wetlands Inventory of type 3 (shallow marsh), 4 (deep marsh), and 5 (lakes). West of the Cannon River, only wetlands over 3000 sq. meters are included; east of the river, only wetlands over 1,500 sq. meters are included
  • ?50 meter buffer around lakes.
  • ?50 meter buffer around eskers.
  • ?Interior (southeast-ward) 1/3 mile buffer of Decorah/Platteville/Glenwood boundary where there is less than 50 ft. of cover
  • ?Subset of MGS' surficial geology coverage where mgscode = 443001 (organic deposits) outside of alluvial/outwash deposits and where depth-to-bedrock is greater than 50 ft.
Moderate - Non-organic, non-alluvial/outwash deposit areas where depth-to-bedrock is greater than 50'.

Low - Subset of MGS surficial geology coverage where mgscode = 443505, glacial lake sediment over till.

Source Scale Denominator100,000

Section 3Spatial Data Organization Information
Native Data Set EnvironmentARC/INFO
Geographic Reference for Tabular DataUTM Coordinates
Spatial Object TypeVector
Vendor Specific Object TypesPolygons
Tiling SchemeRice County

Section 4Spatial Reference Information
Horizontal Coordinate SchemeUTM
EllipsoidGRS 1980
Horizontal DatumNAD83
Horizontal UnitsN.A.
Altitude DatumN.A.
Altitude UnitsN.A.
Depth DatumN.A.
Depth UnitsN.A.
Cell WidthN.A.
Cell HeightN.A.
UTM Zone Number15
Coordinate Offsets or AdjustmentsNone
Distance Resolution 

Section 5Entity and Attribute Information
Entity and Attribute Overview 
Entity and Attribute Detailed Citation 
Table NameField NameBegin ColumnDefinitionValid ValuesDescription 
gwsl2py.pat    Polygon Attribute Table
 sensitivity2510,10,c Pollution sensitivity rating based on estimated vertical travel time for water-borne surface contaminants to reach the aquifer.
    'Very High'Hours to months
    'High'Weeks to years
    'Moderate'Years to decades
    'Low'More than a century

Section 6Distribution Information
PublisherMinnesota Department of Natural Resources, Division of Waters
Publication Date1997
Online Linkage 
Distributor Contact Person 
Distributor OrganizationMinnesota Department of Natural Resources, Division of Waters
Distributor Position 
Distributor Address500 Lafayette Rd.
Distributor CitySt. Paul
Distributor State or ProvinceMN
Distributor Postal Code55155 - 4032
Distributor Voice Phone(651) 296 - 4800
Distributor Fax Phone(651) 296 - 0445
E-mail Address
Distributor's Data Set Identifier  
Distribution LiabilityThis 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 NameARC/INFO, ArcExport, INFO
Transfer Format Version Number7.1.1
Transfer Size 
Ordering InstructionsDownloadable data are accessible through Rice County Geologic Atlas, Part B: Metadata for GIS and Digital Data

Section 7Metadata Reference Information
Metadata DateDecember 19987
Metadata Contact Person GIS Specialist
Metadata Contact OrganizationMinnesota Department of Natural Resources, Division of Waters
Metadata Contact Position GIS Specialist
Metadata Contact Address500 Lafayette Road
Metadata Contact CitySt. Paul
Metadata Contact State or ProvinceMN
Metadata Contact Postal Code55155 - 4032
Metadata Contact Voice Phone(651) 259 - 5693 or (651) 259 - 5700
Metadata Contact Fax Phone(651) 296 - 0445
Metadata Contact
E-mail Address
Metadata Standard NameMinnesota geographic Metadata Guidelines
Metadata Standard Version1.0.4
Metadata Standard Online Linkage 


Full explanation of the compilation of 'gwsl2py.'

First, a  proto sensitivity coverage was created by a stepwise UNION of ten different coverages in ARC/INFO. An order of priority was determined by Moira Campion based on which coverages would be drawn one on top of the other to visually depict water-table pollution sensitivity. Because the UNION command in ARC/INFO merges attributes in the order they are added, with matching items dropped from the incoming coverage, each incoming coverage was given a unique item(s) that would identify its components even after all ten had been unioned together.

CODE1 = 'y'

Polygons from the MGS depth-to-bedrock coverage where depth-to-bedrock is less than 50 ft. These polygons were selected using the selection criterion, 'CINTER' = '<50'. These polygons are rated 'CODE1' = 'y'. Any polygons internal to polygons with 'CODE1' = 'y' were coded as 'CODE1_INT' = 'y'. Thus, polygons with 'CODE1_INT' = 'y' represent areas where depth-to-bedrock is greater than 50 feet.

CODE2 = 'y'

Represents an interior 1/3 mile buffer along the edge of the Decorah-Platteville-Glenwood confining unit. There were no internal polygons

for areas with 'CODE2' = 'y'.

CODE3 = 'y'

Polygons from MGS' depth-to-bedrock coverage with depth-to-bedrock values greater than 50. This set of polygons is the compliment of 'CODE1' polygons. Thus, the entire county was subdivided into regions with depth-to-bedrock less than 50 feet and areas where depth-to- bedrock is greater than 50 feet. 'CODE3_INT', represent areas where depth to bedrock is less than 50 feet.

CODE4 = 'y'

Polygons from MGS' surficial geology coverage meeting one of the following criteria:

  • 'MGSCODE' = 443002, 443006, 443102, 443521, 443527, 443528 (alluvium or outwash designations)
  • 'MGSCODE'= 443001 (organic deposits) and within or near alluvial/outwash deposits.

These polygons were rated 'CODE4' = 'y,'and the internal polygons were designated 'CODE4_INT' = 'y'.

CODE5 = 'y'

Derived from a small coverage used only to counteract discrepancies between various data sources while keeping all sources unchanged. Polygons with 'CODE5' = 'y' have no scientific value and serve only a small cartographic purpose.

CODE6 = 'y'

Polygons from MGS' surficial geology coverage where 'MGSCODE' = 443001 (organic deposits) and not within or near alluvial/outwash deposits. Any internal polygons from this set were given 'CODE6_INT' = 'y'.

CODE7 = 'y'

Selected NWI Wetlands. Only wetlands of type 3 (shallow marsh), 4 (deep marsh) and 5 (lakes) were used. West of the Cannon River, wetlands over 3000 square meters are included; East of the river, wetlands over 1500 square meters are included. Internal polygons (islands within wetland areas) were designated 'CODE7_INT' = 'y'.

CODE8 = 'y'

Derived from a single polygon selected from the MGS' surficial geology coverage having 'MGSCODE' = 443505. This single polygon represents an area of glacial lake sediments. Any polygon having 'CODE8' = 'y' was derived from this single polygon.

CODE9 = 'y'

A 50 meter buffer zone around all but the smallest lakes from the USGS Digital Line Graph (DLG) hydrology layer. The size of the lakes that were excluded from the buffer operation was not documented.

CODE10 = 'y'

Derived from buffered areas around the arcs from the MGS' surficial geology line coverage where 'MGSCODE' = 449011 (eskers) and a portion of one arc with 'MGSCODE' = 449007 (fluvial channel bank, obscure). These arcs were buffered with a 50 meter tolerance and round end-points. In coverage units, this buffering distance roughly approximates the areal extent of these eskers, and was performed to 'polygonize' the line features.

Sensitivity ratings were calculated as follows:

'Very High''High''Moderate''Low'
  • code1 = 'y'(except where code2 also = 'y')
i.e., less than 50 ft. to aquifer
  • code4 = 'y'
i.e., Alluvium / outwash or organic deposits near alluvium / outwash features
  • code7 = 'y'
i.e., Selected Wetlands
  • code9 = 'y'
i.e., 50 meter buffer around selected lakes
  • code10 = 'y'
i.e., Eskers
  • code1 and code2 = 'y'
i.e., Edge of the Decorah-Platteville-Glenwood confining unit with less than 50 ft. of cover
  • code3 and code6 = 'y'
i.e., Organic deposits outside of alluvial/outwash zones and where depth-to-bedrock is greater than 50 ft.

NOTE: All of the criteria for 'Very High,' except code1 = 'y,' override all other criteria.

code3 = 'y' and code6 ne 'y'

i.e., Non-organic, non-alluvial, and non-outwash sediments where depth-to-bedrock is greater than 50 ft.

NOTE: All of the criteria for 'Very High,' except code1 = 'y,' override all other criteria.

code8 = 'y'

i.e., glacial lake sediments

NOTE: All of the criteria for 'Very High,' except code1 = 'y,' override all other criteria

Finally, this proto sensitivity coverage was dissolved on the item 'Sensitivity' resulting in 'gwsl2py.'