Terrain ruggedness and land cover: Improved data for most research designs

Existing arguments about the effect of terrain on intrastate and interstate violence are more varied than the data sources widely used to test such relationships. We introduce precise geo-referenced data on terrain ruggedness and land cover globally at the national, provincial, and 1×1 km grid-square levels. Accordingly, the data are readily applicable to a wide range of research designs, including cross-national, sub-national and single-country designs, as well as any study that uses geographic information system data. We demonstrate the utility of the data with replication of Miguel et al. (2004, Journal of Political Economy 112(4): 725–753) and produce new findings leveraging both the ruggedness and land cover data.