Obtaining Bailey's Ecoregions polygons
First, I obtained the polygon shape file from the
following web site:
For more information about Ecoregions, consult the USDA Forest Service site:
Next, I developed an R script that imposes a regularly-spaced point grid (at user-specified resolution) on top of the polygon map, and then extracts the ECOCODE polygon attribute for he polygon directly underneath each point in the grid.
Next, I developed an R script
To generate the final data set, I employed the sampling method described in the Sampling Description, below.