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. 2015 Jun 29;10(6):e0130566. doi: 10.1371/journal.pone.0130566

Table 1. List of 27 topographic and bioclimatic predictors used for analysis and their ranges over the dataset.

Name Code Range Description Reference
Elevation elev 455–2555m Elevation of 30m pixel [33]
Slope slope 0.75–62.15 degrees Local slope at 30m resolution [33]
Ruggedness Index rugged 4.24–157.46m Terrain heterogeneity over a 3x3 cell neighborhood using a 90m DEM [37]
Sine Aspect/ Cosine Aspect sin.asp/ cos.asp -1.00–1.00 E-W and N-S transformation of aspect at 30m resolution [33]
Beers Aspect Beers 0–2.00 SW-NE transformation of aspect at 30m resolution [33]
Curvature 30m curve30 -7.9–8.45 Combined across and along slope curvature, using a 30m pixel and 3x3 cell window [33]
Curvature 90m curve90 -3.3–4.04 Combined curvature, using a 90m pixel and 3x3 cell window [33]
Local scale topographic position index tpi3.10 -90.93–120.75m Average difference in elevation between a focal cell and neighborhood defined using an annulus of inner radius 90m and outer radius 300m [35]
Intermediate scale topographic position index tpi10.34 -271.77–345.8 m TPI using an annulus of inner radius 300m and outer radius 1020m [35]
Landscape scale topographic position index tpi10.67 -384.3–508.76 m TPI using an annulus of inner radius 300m and outer radius 2010m [35]
TCI 30m tci30 0–366 Topographic convergence index using a 30m pixel [36]
TCI 60m tci60 -0.03–13.21 Topographic convergence index using a 60m pixel [36]
TCI 90m tci90 -0.56–11.02 Topographic convergence index using a 90m pixel [36]
Distance to coast coast.dist 25.27–174.11 km Euclidean distance to coast line
Solar radiation solar 0.15–0.44 MJ/cm2/yr Potential annual direct solar radiation based on latitude, slope and aspect. [34]
Max. temperature warmest month max.tmp 19–33°C [38]
Min. temperature min.tmp 4.1–20.5°C Min. temperature in coldest month [38]
Annual temperature range anntmprng 10.5–18.2°C [38]
Temperature seasonality tmp.seas 891–1783 Temperature seasonality (standard deviation of temperature over the year*100) [38]
Mean temperature dry quarter meantmp.dry 11.9–25.5°C Mean temp from Jan-Mar [38]
Mean temperature warm quarter meantmp.warm 13.9–27.5°C Mean temp from Mar-May [38]
Mean temperature cold quarter meantmp.cold 11.2–24.3°C Mean temp from Nov-Jan [38]
Annual precipitation annprec 754–6080 mm Mean annual precipitation [38]
Precipitation CV prec.cv 50–140 Precipitation seasonality (coefficient of variation based on monthly precipitation values) [38]
Warm quarter precipitation warm.prec 165–893 mm Avg. precipitation from Mar-May [38]
Dry quarter precipitation dry.prec 7–138 mm Precipitation from Jan-Mar [38]