1. 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 ?

  2. Could you please let me know if there is any link between the ESI and Corporate Triple Bottom Line (TBL) Reporting? Alternatively, would you regard the ESI as a proxy for national TBL reporting?

  3. I need some gridded population information so I downloaded GRUMPv1, which seems like it should be perfect for my needs. However the number in the file naup00g.asc (North America unadjusted population counts in the grid) are small floating point numbers. I had expected that they would be population counts in the grid cell, which is what the documentation seems to say. Not sure how to interpret values like "2.35144e-005" as a population count! Am I misinterpreting these somehow?

  4. What is the difference between GPW and GRUMP population grids?

  5. Could you please tell me how and with what kind of weighting the ecological footprint has been factored into the 2002 ESI?

  6. I am looking for the ESI reports for 2003 and 2004.   Is the ESI available for these years?

  7. I have been trying to download the GRUMP/GPW datasets but the web download does not seem to be working.

  8. I have been trying to download the GRUMP/GPW datasets but the web download does not seem to be working.

  9. In GPWv3 Population Density Grid data, .ASCII format, what is the definition of "xllcorner" and "yllcorner" values?

  10. I am having difficulties locating the metadata for your population density data of the world, GPWv3. Is the metadata available online?

  11. I have downloaded India 1995 population data (GPW2). Why is there no variation in colours when I view the files in ArcView?

  12. I'm preparing an article about "human migration and environment". Do you have any data or information relevant to this topic (causes, effects, links)?

  13. How big is the file (.ascii) of GRUMP data? I am downloading from a very fast connection and it is still taking a really long time.

  14. I would like to download GPW and GRUMP data, but I'd like to know if it is possible to download files by some coordinate extent, rather than by country?

  15. Are there any published papers about GPWv4?

  16. After extracting all the data from GRUMP and adding up population by country to get country population totals, should the totals add up to match exactly the totals reported in the country summary?

  17. I’ve downloaded the GRUMP 30 arc-second area grid (ASCII format), and am confused by the units. The meta data says that the units are km2 of land area, but when I unzip the file (using gunzip), producing gluareag_alpha1.asc, then the land cells have values of 56 (or less, if not completely land). Also, the missing value should be -9999 but the data file has 0 instead.

  18. On the "Prevalence of Child Malnutrition" data set using the 1/4 degree raster file called "UW", the values for the visualized raster data ranges from near 0 to over 500. But this does not make sense, because according to the documentation and the readme file, the "UW" file is supposed to represent the percent of children under age 5 who are malnutritioned. By that definition the values should only range from 0-100.

  19. I have imported the country-specific population density grid maps in ArcGIS for Argentina, Mexico and Honduras. I'm trying to join a table of points by latitude/longitude to these maps and export a table with all the data. The problem I'm having is that there does not seem to be any geographic data even though the maps are projected with WGS1984 correctly. I downloaded it from the site in the .bil format.

  20. Since the footprint data uses the spheroid GRS1980, can I just define it as NAD1983? I know that NAD1983 uses GRS1980, but I am not sure if I can define this layer as datum-based instead of spheroid-based.

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