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!

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?

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.

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.

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?

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?

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.

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.

You list this map as "Buenos Aires, Brazil" -- Buenos Aires is in Argentina -- the capital of Brazil is Brasilia. SO which map is this, Buenos Aires or Brasilia??????

http://sedac.ciesin.columbia.edu/maps/gallery/search?facets=theme:remote-sensing&facets=region:south%20america

Downloaded data from the site below. I unzipped them and tried to display in QGIS 2.14. It shows only black and white with min=0 and max=0.

http://sedac.ciesin.columbia.edu/data/set/gpw-v4-population-density-adjusted-to-2015-unwpp-country-totals/data-download

I must be doing something incorrectly.

Thanks,

Hello,
I want to ask you why I can't the following codes in the GB administrative divisions codes dataset: 331120, 341420, 341620 ... I really need to get the location of these codes.

Thank you,

Best Regards,
Siwar khelifa

The data viewer does not display either of these layers and there are errors when trying to download.

I wanted to download all India states village outlines (http://sedac.ciesin.columbia.edu/data/set/india-india-village-level-geospatial-socio-econ-1991-2001/data-download) directly to our server. Is it possible using curl or wget command? If yes, can you share sample please. Thanks.

Many of the mangrove rasters are empty.