We are looking for a high-resolution gridded population data for our project. It seems to us that compared to the GPW3 data, the GRUMP data offer a higher spatial detail and probably a more accurate spatial distribution of population. Which would you recommend ?

If it is not too much work, I would recommend that you run the analysis twice — once with GPW, and a second time with GRUMP.   This would give you an idea of the variability in the two models of population.  However, please note that the alpha version of GRUMP has a tendency to over allocate population from rural areas to urban areas, so we have modified the algorithm for the beta version that we are working on.

For additional information about GPW and GRUMP, please see the links below :

Documentation for GPW is available at:

http://sedac.ciesin.columbia.edu/gpw/docs/gpw3_documentation_final.pdf

and for GRUMP at:

http://sedac.ciesin.columbia.edu/gpw/docs/UR_paper_webdraft1.pdf

More generally, information on both projects is linked from:

http://sedac.ciesin.columbia.edu/gpw/documentation.jsp

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