Northern
California Metric Maps
3 Kilometer Grid U_INDEX Human Land Use RHUM0 Stream Cooridor RHUM30 30 Meter RHUM90 90 Meter N_INDEX Natural Land Use RNAT0 Stream Cooridor RNAT30 30 Meter RNAT90 90 Meter PBAR Barren RBAR0 Stream Cooridor RBAR30 30 Meter RBAR90 90 Meter PAGT Agriculture RAGT0 Stream Cooridor RAGT30 30 Meter RAGT90 90 Meter PAGC Cropland RAGC0 Stream Cooridor RAGC30 30 Meter RAGC90 90 Meter PAGP Pasture RAGP0 Stream Cooridor RAGP30 30 Meter RAGP90 90 Meter PURB Urban RURB0 Stream Cooridor RURB30 30 Meter RURB90 90 Meter PWETL Wetland RWETL0 Stream Cooridor RWETL30 30 Meter RWETL90 90 Meter PFOR Forest RFOR0 Stream Cooridor RFOR30 30 Meter RFOR90 90 Meter PNG Natural Grassland RNG0 Stream Cooridor RNG30 30 Meter RNG90 90 Meter PSHRB Shrubland RSHRB0 Stream Cooridor 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 Watershed/Edge Forest PFPERF9 Grid/Perforated PFINTR9 Grid/Interior REGFAC_COUNT Regulated Facilities MINES_COUNT Mines POPDENS Population Density |
N_INDEX - Percentage of all natural land use The N-Index (all natural use index) metric is the percentage of land cover cells located within the 3 km grid cell reporting unit that are classified as either forest, shrub land, grassland, wetland, or bare rock to the total number of cells inside the grid cell boundary minus those cells classified as water (total land area). This gives the proportion of land area in the grid cell that is in a natural state, but provides no information on the health of the vegetation cover. The N-index shows areas in which land use practices could have less disturbance from human use and is usually the inverse of the U-Index. The values seen here in the Northern California mountain area are generally much higher compared to the central and eastern United States. |