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  Southern California Metric Maps
 HUCs - 10 digit
  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
  AGCSL3 - Steep Slopes
  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 Watershed/Patch Forest
  PFTRAN9 Watershed/Transitional
  PFEDGE9 Watershed/Edge Forest
  PFPERF9 Watershed/Perforated
  PFINTR9 Watershed/Interior
  REGFAC_COUNT Regulated Facilities
  MINES_COUNT Mines
  COWDENS Cow Grazing Intensity
  POPDENS Population Density

Image of Southern California Interstate Density

RDDENSCINT - Road density of interstates

Interstate density is calculated by summing the length of interstates and dividing by the area of the 1 km grid cell reporting unit. Values are reported as km of road class per km2. High road densities are generally well correlated with high human population and urban development. Roads increase imperviousness, potentially decreasing water quality. Roads also fragment habitat and may act as barriers, especially to large mammals. Wider roads and higher traffic volumes will generally have more adverse affects, and impact a larger surrounding area then smaller, less traveled roads.

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