Create a data frame object for UTM values of LL, LR, UL, and UR
Create a SpatialPoints object for UTM values of corners
Generate Extent object in UTM
Create a RasterLayer object for UTM values
Create a SpatialPoints object for lat/lon values of corners
Obtain DEM data projected as long/lat for domain as RasterLayer
Generate Extents object in long/lat projection for cropping
Crop DEM data using 'bbox' Extent object in lat/lon projection
Reproject cropped RasterLayer object from lat/lon to UTM
Crop DEM data using 'bbox' Extent object in UTM proj
Extract heights from the resampled DEM
Create a data frame for the extracted heights in row-major order
Generate a vector of comma-delimited strings
Write the formatted text to disk as "heights.txt"
Make corrections to several comments
Add to .gitignore