Comparing Land Facet Methodologies in the Columbia Plateau

Dec 20, 2012
Uploaded by Jennifer McGuire
Description:
These layers each depict one suite of methodological choices for designating land facets. Scroll through them to see how different choices affect land facet patterns.

Methodological choices: 

Resolution: 1km or 270m

Categorization approach:
  • Categorical overlay- each variable is categorized into ecologically meaningful classes.  Land facets are created from unique combinations of those classes. 
  • K-means clustering- an algorithm clusters the continuous variables into a designated number of facets. The Hartigan index was used to identify the optimal number of facets.  
  • Hybrid approach- a combination of the categorical overlay and a clustering method. Topographic data were categorized, and within each topographic class all other variables were clustered using a fuzzy c-means algorithm
Variable selection:
  • Topographic variables
    • Elevation
    • Slope
  • Soil variables
    • organic matter
    • bulk density
    • soil horizon depth
    • accumulated water content
  • Geology (categorized into 9 types of geological groupings after Anderson)
Normalization: variables normalized (where necessary) within ecoregion or across 14 NW ecoregions
Data Provided By:
Carrie Schloss
Jenny McGuire
Joshua Lawler
Content date:
not specified
Contact Organization:
not specified
Contact Person(s):
Use Constraints:
Creative Commons LicenseThis work is licensed under a Creative Commons Attribution 3.0 License.
Layer:
Layer Type:
Currently Visible Layer:
All Layer Options:
Layers in this dataset are based on combinations of the following options. You may choose from these options to select a specific layer on the map page.
Description:
Spatial Resolution:
Credits:
Citation:
Purpose:
Methods:
References:
Other Information:
Time Period:
Layer Accuracy:
Attribute Accuracy:
FGDC Standard Metadata XML
Click here to see the full FGDC XML file that was created in Data Basin for this layer.
Original Metadata XML
Click here to see the full XML file that was originally uploaded with this layer.
This dataset is visible to everyone
Dataset Type:
Layer Package
Downloaded by 3 Members
Bookmarked by 1 Group

About the Uploader

Jennifer McGuire
Postdoctoral Research Associate with University of Washington

I am a landscape ecologist in Joshua Lawler's Lab