Tools and methods for estimating populations at risk from natural disasters and complex humanitarian crises more accurate population data based on census and other data that provide information such as peoples ages gender ethnicity and where they live are needed to better plan for and respond to humanitarian crises. Tools and methods for estimating populations at risk from natural disasters and complex humanitarian crises committee on the effective use of data methodologies and technologies to estimate subnational populations at risk board on earth sciences resources committee on population division on earth and life studies division of behavioral and social sciences and education national . Tools and methods for estimating population at risk from natural disasters and complex humanitarian crises committee on the effective use of data methodologies and technologies to estimate subnational populations at risk board on earth sciences and resources division on earth and life studies. Tools and methods for estimating populations at risk from natural disasters and complex humanitarian crises reviews the main methods and tools for making estimates of subnational populations and makes several recommendations to improve the collection and the use of population data for emergency response and development. Tools and methods for estimating populations at risk from natural disasters and complex humanitarian crises reviews the main methods and tools for making estimates of subnational populations and makes several recommendations to improve the collection and the use of population data for emergency response and development