IPUMS Terra integrates the world's population and environmental data including...

Population censuses and surveys
Land cover data classified from satellite imagery
Temperature, precipitation, and related climate data
Land use data derived from censuses and surveys in combination with remotely sensed data

IPUMS Terra integrates population and environmental data across disciplinary scientific domains, enabling research into dramatic transformations of human populations, the environment, and their interactions.

IPUMS stands for data integrated across time, space and scientific domains. IPUMS makes it easy to study change and conduct comparative research--by imposing consistent codes, supplying detailed documentation, and creating customized datasets. Data and services are available free of charge.

Find more information about IPUMS here