Sinkholes located on county soil survey reports are located in this
coverage. Sinkholes are only included which are mapped on county soil
surveys. Sinkholes were identified on soil survey maps, hand transfered to
1:250,000 or 1:100,000 maps and digitized from the paper maps.
Purpose:
This digital, geographically referenced data set was developed by the
Iowa Department of Natural Resources to carry out agency responsibilities
related to management, protection, and development of Iowa's natural
resources.
Supplemental_Information:
This coverage could be improved and updated using digital soil survey
data when it becomes available in a commonly recognized GIS format. Some
sinkholes are known by DNR/GSB staff but are not included in this coverage
because they were not mapped by SCS soil mapping staff. Sinkholes in the
following counties were identified on county soil maps, transferred to
1:250,000 maps, and digitized: Allamakee, Bremer, Clayton, Clinton,
Fayette, Howard, Mitchell, and Winneshiek. These were all compiled
originally for the report, Sinkholes, Hydrogeology, and Ground- water
Quality in Northeast Iowa. Sinkholes in the following counties were
identified on county soil maps, transferred to 1:100,000 maps, and
digitized: Butler, Chickasaw, Delaware, Des Moines, Dubuque, Floyd,
Franklin, Jackson, Jones, Linn, and Worth.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 01/19/93
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -93.432333
East_Bounding_Coordinate: -90.107700
North_Bounding_Coordinate: 43.504383
South_Bounding_Coordinate: 40.731077
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: None
Access_Constraints: None
Use_Constraints: None
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Michael Bounk
Contact_Organization: Iowa Department of Natural
Resources
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: sinkhole
Attribute:
Attribute_Label: FID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the
features.
Attribute:
Attribute_Label: AREA
Attribute:
Attribute_Label: PERIMETER
Attribute:
Attribute_Label: SINKHOLE_
Attribute:
Attribute_Label: SINKHOLE_I
Overview_Description:
Entity_and_Attribute_Overview:
AREA: All equal to 0.
PERIMETER: All equal to 0.
SINKHOLE_: Sequential numbers assigned by Arc/Info.
SINKHOLE_ID: Sequential numbers equal to above and have no meaning.
None
Distribution_Information:
Distributor:
Resource_Description: Sinkhole
Distribution_Liability:
This digital, geographically referenced data set was developed by the
Iowa Department of Natural Resources to carry out agency responsibilities
related to management, protection, and development of Iowa's natural
resources. It resides in the Natural Resources Geographic Information System
library. Although efforts have been made to make it useful to the
Department, the Department assumes no responsibility for errors in the
information. Similarly the Department assumes no responsibility for the
consequences of inappropriate uses or interpretations of the data made by
anyone to whom this data has been made available. The Department bears no
responsibility to inform users of any changes made to this data. Anyone
using this data is advised that precision implied by the coverage may far
exceed actual precision. Comments on this data are invited and the
Department would appreciate that documented errors be brought to staff
attention. The development of the coverages in the NRGIS Library represents
a major investment of staff time and effort. As a professional
responsibility, we expect that the Iowa DNR will receive proper credit when
you utilize these GIS coverages and that the original documentation will
remain with any redistribution of these coverages.
