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    1. The map interface for dowloading ACE2 Altimeter Corrected Elevations data is not working

    2. Where is the EPI from 2019/2017/2015/2013/etc. ?

    3. I have successfully downloaded the GPW global datasets for the years 1990, 1995 and 2000. I would like to know if it is advisable to compare datasets of different years in order to assess changes in population densities and therefore migration patterns, or if there are constraints that hinder such operation.

    4. What is the difference between PLACE II and PLACE III?

    5. How does GPWv4 compare to previous versions of GPW?

    6. What is SEDAC?

    7. What do the numbers "mean?"  That is, if Uganda's value is 0.65, does that mean that on a scale of 1-4 (1 being the least) that Uganda is very unlikely to be exposed to the 6 hazards you describe?

    8. How can I access the 1980 and 1990 Census, STF3a files?

    9. Why are there negative numbers in the Population Density files(GPW V4.11)?

    10. Will SEDAC develop other similar regional collections?

    11. What is the projection that the Census use for its ArcInfo files?

    12. What happened to ENTRI?

    13. I was interested in obtaining a Geographic Correspondence file, particularly Block Group to Block, for every state, containing allocation factors for Population, Land Area & Housing Units. Is it possible to obtain these .csv files directly from you?

    14. I am looking for the population and the surface area (in square kilometers) for several cities throughout the globe.  I found several datasets available in GRUMP, but I didn't find anything with both population and surface area.

    15. I divided one 30 Arc-Second (~1km) Basic Demographic Characteristics raster by another and ended up with very high values in the result.

    16. I am a graduate student. I am interested in all the chinese information and maps at your website and trying to design a small project for my class. But I find there are no information about the map projection. The administrative Region map projection is different from that of the Fundamental Maps.

    17. How is the Composite map of the Human Influence Index performed (0-64)?

    18. I am trying to locate maps online of the Metropolitan Statistical Areas (MSAs) for all US states and Puerto Rico and haven't had much luck. Can you tell me where I might find these maps?

    19. In reviewing the latest statistics on environmental sustainability from your website, I noted that the Faroe Islands was not listed. Could you please advise me on the criteria regarding who is included in the 2002 ESI rankings?

    20. How do I convert .BIL format in Arcview/ArcInfo?

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