I'm from the Census Bureau and I am always being asked for a way by which people who wish to analyze our data either across different geographic boundary definitions or over time wherein boundaries changed. It would be so awesome if you guys could open-source your algorithm so that we could share it with the world of folks who need something like this :)

If you want to use SEDAC WMS with openlayers.js, it would be nice to provide a (link to a ) working sample code like http://jsfiddle.net/F9pUs/ (which actually does not show the SEDAC layer)

Hi, I am trying to read the population density data in 2005 and 2015 in Matlab. I am using the following codes.

[pop, R] = geotiffread('gpw-v4-population-density_2005.tif');
figure
mapshow(pop, R);

The reference R looks normal, but the density matrix pop has huge negative numbers in each entry. I also tried to use Mathematica to read the file, and it also does not work. Could you provide us simple examples on how to access your tif file? Thanks!

Thank you for providing yours data and service.

I have two suggestion for your server configuration that can improve your WMS

1) Can you make the content available via HTTPS? (https://developer.mozilla.org/en-US/docs/Security/MixedContent/How_to_fix_website_with_mixed_content)

2) Can you adding CORS support to the server? (http://www.html5rocks.com/en/tutorials/cors/#toc-adding-cors-support-to-the-server)

Thank you for your kind cooperation.

Your metadata used to be accessible by https. Did your certificate expire?
Here is an example error:

Not Found
The requested URL /data/set/gpw-v4-population-density-rev10 was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

Very large data-sets (e.g., global roads at ~200MB) are very difficult to download at one go when in poor/unreliable bandwidth areas. Suggest one or more of the following:
1. breakup data sets into smaller regional and/or country level chunks
2. allow downloads to resume after interruption
3. use distributed methods of serving data (p2p, torrents, etc) ... this will also reduce your server / bandwidth requirements!

Do you plan to provide your data layers as REST services?

Hi I noticed your SSL Cert has lapsed. We link to the metadata and the htttps link used to work but its stopped. Could you enable it?

I have downloaded your Human Footprint Index, v2 maps for both Europe and Asia; there were no Istanbul and other European cities in Turkey in both continental maps. Could you add the European side, please?

on this page: http://sedac.ciesin.columbia.edu/data/set/gpw-v3-population-density/data-download
After I logged in, filled all the fields (region>global>Pop Density grid>grid>2.5'>2000), and hit "Download", nothing happens. I tried with Google Chrome and Mozilla Firefox.

I am looking at the possibility of using the HII to understand anthropogenic impact on North American birds as a part of my graduate research. I noticed that the data available is for 1995-2004 and was wondering if 2005-14 is on the works. SO my questions are: 1. Are you working on HII 2005-14? and 2. If you are, will the data be publicly available? When? Thanks.

By having to download multiple files, 50 records at a time, it increases the chance for error. But also means I need to spend lots of time making sure I got everything.

Hi. I am downloading the Air Quality for Health-Related Applications. For years 2006 - 2009, the download file for August is the same as the July file. At least, the file names are the same (I did not check the contents). Will you please provide the August file for these years?

perhaps this can be a snapshot image before trying to load the client everytime someone visits the home page. Click on the snapshot would enable the client or something like that..

Hello,

I downloaded "Gridded Population of the World, Version 3 (GPWv3): Centroids". It is really terrific data! Bravo!

But I must say that I wasn't able to use correctly administrative level names: problems with diacritic symbols (like "ñ", "ç", "à" etc.).

I couldn't identify encoding of data (unicode, ISO8859-1, ?). So please could you give information about this encoding (inside metadata?).

Thanks in advance.
Michel (France)

The closest way i figured is to download the ascii file and import it as a raster, but it has no spatial reference.

Thank you beforehand

I would like to amke a study on hpw to improve the EPI of South Africa.How did EPI came to being. When was it formed