LANDSCAPE METRIC DESCRIPTIONS:
ALL METRIC CATEGORIES
Area - Total area in map units
Perimeter - Total perimeter in map units
LANDSCAPE CHARACTERISTICS
Land_area - Total terrestrial area in map units (total area minus water)
LC_overlap - Percent overlap between reporting unit and land cover themes
SL_LndArea - Total terrestrial area (total area minus water) in map units for the land cover/slope composite grid
SL_Overlap - Percent overlap between reporting unit and land cover/slope composite grid
Land cover proportions:
Pagc - Percentage of reporting unit that is crop land
Pagp - Percentage of reporting unit that is pasture
Pagt - Percentage of reporting unit that is all agricultural use
Pfor - Percentage of reporting unit that is forest
Pbar - Percentage of reporting unit that is barren
Png - Percentage of reporting unit that is natural grassland
Pshrb - Percentage of reporting unit that is shrubland
Purb - Percentage of reporting unit that is urban
Pwetl - Percentage of reporting unit that is wetland
N_index - Percentage of reporting unit that is all natural land use
U_index - Percentage of reporting unit that is all human land use
*Each of the above will also have a field with _A appended (e.g. Pfor_A) representing total area in map units.
Slope metrics:
AgcSL3 - Percentage of reporting unit that has agricultural crop land on slopes >= 3
AgpSL3 - Percentage of reporting unit that has agricultural pasture on slopes >= 3
AgtSL3 - Percentage of reporting unit that has any agricultural land use on slopes >= 3
*Each of the above will also have a field with _A appended (e.g. AgtSL3_A) representing total area in map units.
Patch metrics:
FNumber - Number of forest patches within the reporting unit
FAvgSize - Average size of forest patches within the reporting unit
FPatDens - Forest Patch density within the reporting unit (number of patches/km2)
FLargest - Size of largest forest patch within the reporting unit
F_PLGP - Proportion of largest forest patch to total area of forest within the reporting unit
Fedge210 - Percentage of reporting unit that is defined as edge forest
FCore210 - Percentage of reporting unit that is defined as core forest
FEA210 - Ratio of edge forest to area
Pff9 - Average forest connectivity within the reporting unit for user defined scale
PfPtch9 - Percentage of reporting unit that is patch forest class for user defined scale
PfTran9 - Percentage of reporting unit that is transitional forest class for user defined scale
PfEdge9 - Percentage of reporting unit that is edge forest class for user defined scale
PfPerf9 - Percentage of reporting unit that is perforated forest class for user defined scale
PfIntr9 - Percentage of reporting unit that is interior forest class for user defined scale
*User defined scale is a 9 by 9 window of grid cells.
Diversity measurements:
S - Simple diversity
H - Shannon-Weiner diversity
H_Prime - Standardized Shannon-Weiner diversity
C - Simpson index
RIPARIAN CHARACTERISTICS
RLA{n} - Land area within {n} map units of a stream
SLA{n} - Land area within {n} map units of a sample point
RO - Percent overlap of riparian zones and land cover
Riparian zone metrics:
Ragc0 - Percentage of stream length adjacent to cropland
Ragp0 - Percentage of stream length adjacent to pasture
Ragt0 - Percentage of stream length adjacent to all agricultural use
Rfor0 - Percentage of stream length adjacent to forest
Rhum0 - Percentage of stream length adjacent to all human land use
Rbar0 - Percentage of stream length adjacent to barren
Rnat0 - Percentage of stream length adjacent to all natural land use
Rng0 - Percentage of stream length adjacent to natural grassland
Rshrb0 - Percentage of stream length adjacent to shrubland
Rurb0 - Percentage of stream length adjacent to urban
Rwetl0 - Percentage of stream length adjacent to wetland
Each of the riparian metrics may have a number greater than 0 following the code to represent a buffer distance. For example, Rfor30 is the percentage of forest in a 30 (map units) stream buffer area. If the buffer distance was a real number, it is rounded to the nearest integer.
HUMAN STRESSORS
Land_area - Total terrestrial area in map units (total area minus water)
LC_overlap - Percent overlap between reporting unit and land cover themes
P_Load - Phosphorus loading (kg/ha/yr)
N_Load - Nitrogen loading (kg/ha/yr)
POPDENS - Population density reported as population count/area of reporting unit in km2
POP90 - Population count via area-weighted redistribution.
PCTIA_LC - Percentage of reporting unit composed of impervious cover, based on land use
RDDENS* - Road density reported as km of roads/area of reporting unit in km2
RDLEN* - Total road length in map units
PCTIA_RD - Percentage of reporting unit composed of impervious cover, based on road density
PHYSICAL CHARACTERISTICS
ELEVMIN - Minimum grid cell value within reporting unit
ELEVMAX - Maximum grid cell value within reporting unit
ELEVRNG - Range of grid cell value within reporting unit
ELEVMEAN - Average grid cell value within reporting unit
ELEVSTD - Standard deviation of grid cell value within reporting unit
SLPMIN - Minimum grid cell value within reporting unit
SLPMAX - Maximum grid cell value within reporting unit
SLPRNG - Range of grid cell value within reporting unit
SLPMEAN - Average grid cell value within reporting unit
SLPSTD - Standard deviation of grid cell value within reporting unit
STRMDENS* - Stream density reported as km of streams / area of reporting unit in km2
STRMLEN* - Total stream length in map units