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
|Section 1||Identification Information|
|Minnesota Clearinghouse ID|
|Abstract||Sensitivity of the water table to pollution|
|Purpose||County Geologic Atlas Program: Atlas C-9 Part B, Plate 9 Pollution Sensitivity|
|Time Period of Content Date||1993 - 1997|
|Maintenance and Update Frequency||None Planned|
|Spatial Extent of Data||Rice County, Minnesota|
|West Bounding Coordinate||458,001|
|East Bounding Coordinate||496,882|
|North Bounding Coordinate||4,932,388|
|South Bounding Coordinate||4,893,695|
|Place Keywords||Rice County, Minnesota|
|Theme Keywords||Pollution Sensitivity, Water Table, Aquifers|
|Theme Keyword Thesaurus|
|Contact Person||Moira Campion|
|Contact Organization||Minnesota Department of Natural Resources, Division of Waters|
|Contact Person Position||Hydrogeologist|
|Contact Address||500 Lafayette Road|
|Contact City||St. Paul|
|Contact State or Province||Minnesota|
|Contact Postal Code||55155 - 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 Sets||Atlas C-9 Part A, produced by the Minnesota Geological Survey|
|Section 2||Data Quality Information|
|Logical Consistency||Data are topologically correct using ARC/INFO 7.1.1.|
|Horizontal Positional Accuracy||N.A.|
|Vertical Positional Accuracy||N.A.|
|Lineage||NOTE: 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 -
Low - Subset of MGS surficial geology coverage where mgscode = 443505, glacial lake sediment over till.
|Source Scale Denominator||100,000|
|Section 3||Spatial Data Organization Information|
|Native Data Set Environment||ARC/INFO|
|Geographic Reference for Tabular Data||UTM Coordinates|
|Spatial Object Type||Vector|
|Vendor Specific Object Types||Polygons|
|Tiling Scheme||Rice County|
|Section 4||Spatial Reference Information|
|Horizontal Coordinate Scheme||UTM|
|UTM Zone Number||15|
|Coordinate Offsets or Adjustments||None|
|Section 5||Entity and Attribute Information|
|Entity and Attribute Overview|
|Entity and Attribute Detailed Citation|
|Table Name||Field Name||Begin Column||Definition||Valid Values||Description|
|gwsl2py.pat||Polygon Attribute Table|
|sensitivity||25||10,10,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 6||Distribution Information|
|Publisher||Minnesota Department of Natural Resources, Division of Waters|
|Distributor Contact Person|
|Distributor Organization||Minnesota Department of Natural Resources, Division of Waters|
|Distributor Address||500 Lafayette Rd.|
|Distributor City||St. Paul|
|Distributor State or Province||MN|
|Distributor Postal Code||55155 - 4032|
|Distributor Voice Phone||(651) 296 - 4800|
|Distributor Fax Phone||(651) 296 - 0445|
|Distributor's Data Set Identifier|
|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||ARC/INFO, ArcExport, INFO|
|Transfer Format Version Number||7.1.1|
|Ordering Instructions||Downloadable data are accessible through Rice County Geologic Atlas, Part B: Metadata for GIS and Digital Data|
|Section 7||Metadata Reference Information|
|Metadata Date||December 19987|
|Metadata Contact Person||GIS Specialist|
|Metadata Contact Organization||Minnesota Department of Natural Resources, Division of Waters|
|Metadata Contact Position||GIS Specialist|
|Metadata Contact Address||500 Lafayette Road|
|Metadata Contact City||St. Paul|
|Metadata Contact State or Province||MN|
|Metadata Contact Postal Code||55155 - 4032|
|Metadata Contact Voice Phone||(651) 259 - 5693 or (651) 259 - 5700|
|Metadata Contact Fax Phone||(651) 296 - 0445|
|Metadata Contact |
|Metadata Standard Name||Minnesota geographic Metadata Guidelines|
|Metadata Standard Version||1.0.4|
|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:
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.'