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    1. Where is aerosol optical depth on the app?

    2. What are the differences between GPW, GRUMP and Landscan?

    3. When will the rasters of census variables (sex, age, and urban/rural designation) be released?

    4. What is the difference between the Water Mask layer and the Water Area layer?

    5. Can I assemble the releases of the EPI into a time series or panel dataset?

    6. I am working on a map of Mexico that details population dynamics at the state level and am wondering if you have such information (e.g., total fertility rate, natural increase, inward and outward migration), or if you have a suggestion as to who I might contact.

    7. What is a .BIL image file format?

    8. What are the differences between GPW, GRUMP and Landscan?

    9. Why does Egypt look different than the rest of northern Africa in the population count and density rasters?

    10. I am participating in a research study and am in need of population density maps for select countries in Africa and Asia. Can your organization provide me with such maps?

    11. What is the difference between PLACE I and PLACE II?

    12. What is the reason that an EPI was established as a complement to the ESI?

    13. What is the reason that an EPI was established as a complement to the ESI?

    14. I'm studying the Yangtze river flood (July-August 1998) and I need a detailed map of this area of China. I will grateful if you help me to find it.

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

    16. 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.

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

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

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

    20. What is SEDAC?

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