The anthropogenic biomes data set was created using a multi-stage empirical processs based on the following global data sets:
1. Population density data (Landscan 2005; 30 arc second resolution)
2. Land use (percent areaa of pasture, crops, irrigation and rice Siebert et al 2005)
3. Land cover (percent area of trees and bare earth; 15 arc second resolution; Hansen et al 2003)
Processing steps:
1. Separate "anthropogenic" from "wild" cells based on presence of human populations, crops or pastures
2. Two-step cluster analyses to stratify anthropogenic and wild cells into various biomes using cluster analysis.
3. Stratification based on population density classes (dense, residential, populated and remote based on their non-urban population density, percent urban area, pasture, crops, irrigated, rice, trees and bare earth.
4. Describe and label clusters into 18 broad anthropogenic biome classes.