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  Southern Rockies Metric Maps
  3 Kilometer Grid
  U_INDEX Human Land Use
  RHUM0 Stream Corridor
  RHUM30 30 Meter
  RHUM90 90 Meter
  N_INDEX Natural Land Use
  RNAT0 Stream Corridor
  RNAT30 30 Meter
  RNAT90 90 Meter
  PBAR Barren
  RBAR0 Stream Corridor
  RBAR30 30 Meter
  RBAR90 90 Meter
  PAGT Agriculture
  RAGT0 Stream Corridor
  RAGT30 30 Meter
  RAGT90 90 Meter
  PAGC Cropland
  RAGC0 Stream Corridor
  RAGC30 30 Meter
  RAGC90 90 Meter
  PAGP Pasture
  RAGP0 Stream Corridor
  RAGP30 30 Meter
  RAGP90 90 Meter
  PURB Urban
  RURB0 Stream Corridor
  RURB30 30 Meter
  RURB90 90 Meter
  PWETL Wetland
  RWETL0 Stream Corridor
  RWETL30 30 Meter
  RWETL90 90 Meter
  PFOR Forest
  RFOR0 Stream Corridor
  RFOR30 30 Meter
  RFOR90 90 Meter
  PNG Natural Grassland
  RNG0 Stream Corridor
  RNG30 30 Meter
  RNG90 90 Meter
  PSHRB Shrubland
  RSHRB0 Stream Corridor
  RSHRB30 30 Meter
  RSHRB90 90 Meter
  AGCSL3 Ag Steep Slopes
  AGPSL3 Pasture Steep Slopes
  AGTSL3 Total Steep Slopes
  C Diversity
  H Diversity, Shannon Weiner Index
  H - prime Diversity, Shannon Weiner Index
  S Diversity
  N_Load Nitrogen Load
  P_Load Phosphorus Load
  Impervious/Land Class
  Impervious/Road Density
  STRMLEN Stream Length
  STRMDENS Stream Density
  RDLEN Road Length
  RDLENCINTE Interstates
  RDLENCHIGH Highways
  RDLENCROAD Surface Road
  RDDENS Road Density
  RDDENSCINT Interstates
  RDDENSCHIG Highways
  RDDENSCROA Surface Road
  FNUMBER Forest Patches
  FPATDENS Forest Density
  FLARGEST Largest Forest
  FAVGSIZE Average Forest
  PLGP Proportion of Forest
  FEDGE210 Forest Edge
  FCORE210 Forest Interior
  FEA210 Forest Edge/Total
  PFF9 Forest Cell
  PFPTCH9 Grid/Patch Forest
  PFTRAN9 Grid/Transitional
  PFEDGE9 Grid/Edge Forest 
  PFPERF9 Grid/Perforated
  PFINTR9 Grid/Interior
  REGFAC_COUNT Regulated Facilities
  MINES_COUNT Mines
  COWDENS Cow Grazing
  POPDENS Population Density

Image of Southern Rockies Edge Forest

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PFEDGE9 - Percentage of 3 km grid cell classified as edge forest (9x9)

Percentage of edge forest is calculated using a moving 270 meter square window (9 pixels x 9 pixels) across the land cover. When the percent forest in the window is greater than 60%, but less than the window's PFF9 value, the forest cell in the center of the window is classified as edge. The number of edge forest cells in the 3 km grid cell reporting unit is then divided by the grid cell's total land area (the total number cells in the grid cell boundary minus those cells classified as water) to derive PFEDGE9. Edge forest indicates largely continuous, clumped forest which probably provides migration corridors across an area, but may or may not provide suitable interior habitat, depending on the species.

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