Table 2 Environmental predictors and data sources for species distribution modelling
From: Plant and animal endemism in the eastern Andean slope: challenges to conservation
Variable | Data Source |
|---|---|
Mean annual temperature, mean temperature diurnal range, isothermality, precipitation of wettest and driest month, precipitation seasonality | Worldclim, (Hijmans et al. 2005. www.worldclim.org), 1-km resolution |
Topography: Elevation | Shuttle Radar Topography Mission digital elevation data provided by CGIAR (http://srtm.csi.cgiar.org/) resampled to 1-km resolution |
Slope | Degree of slope (maximum rate of change in elevation from each pixel to its 8 neighbors) derived from the SRTM digital elevation data |
Topographic exposure | Expresses the relative position of each pixel on a hillslope (e.g. ridge, valley, toe slope). Using methods of Zimmermann (2000) on the SRTM digital elevation data with three neighborhood windows of 3x3, 6x6 and 9x9 |
Percent tree cover | MODIS global vegetation continuous fields sourced from http://glcf.umiacs.umd.edu/data/modis/vcf/data.shtml (Hansen et al. 2003) 1-km resolution, and summarized within 3- and 5- km moving windows |
Enhanced Vegetation Index (EVI) Principal component 1 Principal component 2 | MODIS vegetation indices 16-Day data product sourced from the NASA EOS data gateway; Principal component analysis of 3 years of 16-day composites. MODIS EVI data summarized within 5 km moving window |