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  1. Open-sourcing your grid-making algorithm

    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 :)

    13 votes
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      0 comments  ·  Flag idea as inappropriate…  ·  Admin →
    • Provide working minimalistic openlayers WMS example

      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)

      10 votes
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        9 comments  ·  Flag idea as inappropriate…  ·  Admin →
      • Read the data in Matlab

        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!

        7 votes
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          0 comments  ·  Flag idea as inappropriate…  ·  Admin →
        • WMS Improvement

          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.

          5 votes
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            0 comments  ·  Flag idea as inappropriate…  ·  Admin →
          • Do this all for the 2010 census?

            I would love information on population density etc. from the most recent census. Is there a reason this is only the 2000 data?

            5 votes
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              planned  ·  1 comment  ·  Flag idea as inappropriate…  ·  Admin →
            • make downloads resumable

              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!

              4 votes
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                0 comments  ·  Flag idea as inappropriate…  ·  Admin →
              • Data Layers as REST

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

                4 votes
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                  0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                • Inconsistency in total population

                  Hi,

                  I am using the gpw v3 density maps on Matlab and I do a spherical integration to compute the total population on the planet.
                  For every map from 2000 to 2020, I find 24% more than the UN projects. But the gap between SEDAC and UN counts only accounts for 2 or 3% in 2000 so there is another problem.

                  Is it because in cells with both land and sea, the density in the data is the terrestrial density ? It would explain why I get too much total population when integrating while considering that the density is applicable…

                  3 votes
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                    0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                  • algorithmically clean some outliers

                    Some 1km gridcells in the 2015 UN-adjusted dataset have population values as high as 183,000 persons per km2. These hyperpopulated cells account for ~30% of global population!

                    Hong Kong and Brazzavile are two examples: in real life according to wikipedia Hong Kong's densest suburb has density of 57,000 people/km2. Similarly you have values as low as 1e-12. Why not set a ceiling and floor, and redistribute surplus population to the whole country.

                    As it stands we users have to do a lot of data cleaning to be able to use dataset but automatically cleaning such outliers should be rather easy…

                    3 votes
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                      0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                    • Download doesn't work

                      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.

                      2 votes
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                        2 comments  ·  Flag idea as inappropriate…  ·  Admin →

                        Thanks for the feedback. Checking it now. It seems to be working on those browsers for me at the moment. Please try downloading again but bypass logging in by using the ’Guest Download" button at the bottom of the login/signup page that comes up after clicking the download button. Hope that makes some sense. Let us know if you continue have problems.

                      • Save the data before the trump effect begins?

                        Are you joining with the effort to copy climate modeling data from Federal Sites?

                        A panic began just after the elections that trump with his cabinet picks will shutdown all Federal sites doing climate modeling work. NOAA and NASA Gistemp are the two most prominent.

                        If you can and are willing to, use RSYNC to copy your servers to Switzerland or else Canada servers.

                        I have started using data from your servers, gridded 1990 and 2000 US Census numbers. I could be doing some work with max summer temperatures in the future. I hope not lose this site as a…

                        2 votes
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                          0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                        • comparison between GPWv3, GRUMP and worldpop

                          I found large inconsistencies for population count in Tanzania between GPW 2010 and worldpop 2010 at the district level (2002 boundaries). It looks like GRUMP is more comparable, but it is difficult to compare as GRUMP is not available for 2010. Do you know the reason for the inconsistencies? and would you recommend GPW or GRUMP when calculating population at the district level? Finally, will GRUMP be available for later years in the near future?

                          Best,
                          Julie

                          1 vote
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                            0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                          • have a more flexible way of searching the Map Gallery

                            On the URL http://sedac.ciesin.columbia.edu/maps/gallery/search/10 I sought information about the United States, in connection with my present research. By page 7 I realized the maps are largely sorted alphabetically by geographical location. Since I aim to see what's available, it appears that I have to click "next" another five dozen times in order to possibly reach the maps for USA. Is there a shortcut?

                            1 vote
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                              0 comments  ·  Flag idea as inappropriate…  ·  Admin →

                              Murray, there is a “browse by location” at the bottom of the left column on the map gallery page. You can choose the US from there and that will limit the gallery to three pages. You can also search for “United States” at the top of the same column. If there is a specific map or data set you are interested in let us know and we can tell you what we have available.

                              Cheers,

                              Joe Schumacher
                              SEDAC User Services

                            • Hong Kong Urban Extent (GRUMP)

                              The map for the Hong Kong Urban Extent (GRUMP v1) is incorrect - it shows NO urban extent, and Hong Kong is very urban...
                              http://sedac.ciesin.columbia.edu/downloads/maps/grump-v1/grump-v1-urban-extents/hkgextents.png

                              1 vote
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                                0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                              • GPWv3 link points to an alpha site

                                Hi it's me Sneha :) I was visiting the GPW collections page and found a bug on http://sedac.ciesin.columbia.edu/data/collection/gpw-v4, towards the end of the last para on "To see the previous version of GPW, visit the GPWv3 data collection". The link to GPWv3 points to an alpha.sedac.ciesin page.

                                1 vote
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                                  0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                                • Human Influence Index 2005-2014?

                                  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.

                                  1 vote
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                                    0 comments  ·  Flag idea as inappropriate…  ·  Admin →

                                    Hi,

                                    There are plans to update the HII. However, we are waiting for the updates to the input data layers of HII. An updated HII may not be available until next year.

                                    To be notified of the latest data releases, including HII and related news that may interest you, please consider following SEDAC on twitter (twitter.com/ciesin) or Facebook (Socioeconomic Data and Applications Center).

                                    Lisa Lukang
                                    User Services

                                  • fill in Northern Pakistan

                                    I thought I had a bad download, but the documentation shows a hole in N. Pakistan. This area is filled in VMAP, so it seems like that area could be filled. Is there a version of groads asia that includes this?

                                    1 vote
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                                      0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                                    • 1 vote
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                                        0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                                      • information about data encoding

                                        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)

                                        1 vote
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                                          0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                                        • 1 vote
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