waterosion100

This page last updated: 05/12/2011
Metadata created using Minnesota Geographic Metadata Guidelines


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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 Board of Water and Soil Resources
Title waterosion100
Abstract This data layer represents a general risk score for potential soil erosion on a 0-100 point scale, 100 being the highest risk. Larger values indicate soils that have a higher potential to erode if no conservation practices were in place and overland sheet or rill runoff was present.
A subset of the Universal Soil Loss Equation (USLE) was used to determine potential erosion values. The USLE is a multiplicative equation using the formula A =R x K x LS x C x P where:
" A = potential long term average annual soil loss in tons/acre/year.
" R = rainfall and runoff factor
" K = soil erodibility factor
" LS = slope length-gradient factor
" C = crop/vegetation and management factor
" P = support practice factor
The R (Rainfall), K (Soil Erodibility), and LS (Length/Slope) factors were used and calculated based on NRCS spatial and tabular SSURGO soils data, statewide county based climate maps, as well as mathematical formulas based on standard USLE calculations. SSURGO stands for Soil Survey Geographic Database.
The crop/vegetation and management factor and support practice factor were not used. This is because there are no reliable statewide spatial data that represent these factors. Although there exist statewide data depicting current cropping practices, there are no statewide data representing current tillage methods (e.g. fall plow, ridge tillage, no-till) or support practice (e.g. cross slope, contour farming, strip cropping) that are required for these calculations. Furthermore these factors are temporal and will therefore shift over time.
Since only non-management factors were used, the resulting data layer should be viewed as a "worst-case" scenario, i.e. highest potential soil erosion of bare soil with no mitigating land use practices in place. Although quantitative soils loss numbers (tons/acre/year) may be exaggerated under this model, the resulting data layer is used here in a qualitative, comparative capacity in order to compare the relative differences in soil loss risk between various parts of the landscape.
Purpose This layer is one portion of an Environmental Benefits Index with the original intention to rank CRP and other critical lands on multiple ecological benefits simultaneously.
Time Period of Content Date 05/01/2009
Currentness Reference Data was calculated from 2009 SSURGO soil polygons
Progress Complete
Maintenance and Update Frequency None Planned
Spatial Extent of Data
Bounding Coordinates -97.269142
-91.017070
49.404062
43.438097
Place Keywords Minnesota
Theme Keywords
Theme Keyword Thesaurus
Access Constraints
Use Constraints
Contact Person Information Aaron Spence, GIS specialist
Minnesota Board of Water and Soil Resources

St. Paul, MN 
Phone: 651.296.0660
Email: aaron.spence@state.mn.us
Browse Graphic None available
Associated Data Sets EBI300, waterqual100, wildlife100

Section 2 Data Quality
Attribute Accuracy Calculated for SSURGO soil polygons (minimum mapping unit of 2-5 acres)
Logical Consistency
Completeness Statewide where SSURGO polygons exist as of May 2009
Horizontal Positional Accuracy
Lineage Dataset copied.

Section 3 Spatial Data Organization (not used in this metadata)

Section 4 Coordinate System
Horizontal Coordinate Scheme
Horizontal Datum NAD83
Horizontal Units Meters
Cell Width 30.000000
Cell Height 30.000000

Section 5 Attributes
Overview
Detailed Citation
Table Detail:

Section 6 Distribution
Publisher Minnesota Board of Water and Soil Resources
Publication Date
Contact Person Information Aaron Spence, GIS Specialist
Minnesota Board of Water and Soil Resources

St. Paul, MN 
Phone:
Email: aaron.spence@state.mn.us
Distributor's Data Set Identifier Downloadable Data
Distribution Liability THE GIS DATA ARE PROVIDED TO YOU AS IS AND WITHOUT ANY WARRANTY AS TO THEIR PERFORMANCE, MERCHANTABILITY, OR FITNESS FOR ANY PARTICULAR PURPOSE. The Minnesota Board of Water and Soil Resources does not represent or warrant that the GIS Data or the data documentation are error-free, complete, current, or accurate. You are responsible for any consequences resulting from your use of the GIS Data or your reliance on the GIS Data. You should consult the data documentation for this particular GIS Data to determine the limitations of the GIS Data and the precision with which the GIS Data may depict distance, direction, location, or other geographic features. If you transmit or provide the GIS Data (or any portion of it) to another user, the GIS Data must include a copy of this disclaimer.
Ordering Instructions
Online Linkage None available

Section 7 Metadata Reference
Metadata Date 05/12/2011
Contact Person Information ,


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Phone:
Email:
Metadata Standard Name Minnesota Geographic Metadata Guidelines
Metadata Standard Version 1.2
Metadata Standard Online Linkage http://www.gis.state.mn.us/stds/metadata.htm


This page last updated: 05/12/2011
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