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  1. 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 →
    • please help me..

      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,

      1 vote
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        0 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!

        1 vote
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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 →
          • Global roads download does not work

            This link
            http://sedac.ciesin.columbia.edu/data/set/groads-global-roads-open-access-v1/data-download
            Looking for Africa but also tried with Global map.
            Using Google chrome, Windows 10, attempting to repair with Winzip, files always come back as broken and incomplete when decompressing.

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              0 comments  ·  Flag idea as inappropriate…  ·  Admin →
            • Increase world awareness.

              This could be TOOL NO. 1 for "saving the planet".
              - Share Maps on Facebook.
              - Add yearly, monthly, weekly and daily World Sustainability Index. Nearly important as daily weather report.
              - Map of rate of change (daily, weekly, monthly, yearly)
              - Yearly award ceremony for positive rate of change and absolute level.

              Fantastic project!
              Is there any correlation between sustainability map, poverty, violence, happiness maps?

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

                Hi. I downloaded the population density, V4 data. However, I have not been able to uncompress the files. I have tried in 2 different computers using different software. I do not know if I am doing something wrong

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

                    • 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.

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                        0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                      • Provide a sample request for WPS Population Estimation

                        I am trying to execute the WPS but I'm not sure if the format of the xml that I'm providing is correct. A sample request would help me and other users to use the plugin more efficiently.

                        Thanks

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                          0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                        • Give step-by-step instructions on using your datasets

                          There should be a guide on how to properly use the datasets ie how to open them, use the data in JSON format. I, as a new user, know not how to open .tiff files or how to get the data into a CSV or JSON format. Guidelines on this would be much appreciated. The dataset I have downloaded is the zip with population density for 2015 for e.g.
                          Thanks!

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                            0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                          • 1 vote
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                              0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                            • I think that GDP layers do not have projection

                              Hello, in GDP layers' metadata it describes WGS84 as its projection. Despite that, after downloading these layers, I realized that the folder just contained the tiff documents. So I think you may not have realized these layers are not projected.

                              All the best,
                              Luis

                              1 vote
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                                0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                              • Use much higher resolution data avilable for Norway

                                The GPW4 maps (e.g. http://beta.sedac.ciesin.columbia.edu/data/set/gpw-v4-population-density-adjusted-to-2015-unwpp-country-totals) uses lower resolution data sets for some countries than necessary. Nor example, it only goes down to municipality level in Norway, while 250 m resolution for that country is available here:
                                https://www.ssb.no/natur-og-miljo/geodata
                                It is distributed as a set of shapes (https://www.ssb.no/natur-og-miljo/_attachment/101145?_ts=13d3e62d7d0), and corresponding densities (https://www.ssb.no/natur-og-miljo/_attachment/260833?_ts=153847c0a78). I'm sure similar data is available for most other European countries.

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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

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                                  • Can I get annual PM2.5 data from 1998 to 2012?

                                    The Global Annual PM2.5 Grids from MODIS, MISR and SeaWiFS Aerosol Optical Depth (AOD) data sets represent a series of three-year running mean grids (1998-2012) of fine particulate matter. Can I get annual data from this dataset?

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                                    • Values in gl_grumpv1_ntlbndid_ascii_30 don’t match between .dbf and .asc files

                                      I’m looking at the identifier grid file, and the values in the gluntlbnds.dbf file don't match the content of the data in gluntlbnds.asc. For example, when I inspect the 1x1 degree area surrounding the point where Poland, Germany, and the Czech Republic meet, I see the values 167, 52, and 51. In the .dbf file, these should be 137, 111, and 110 respectively.

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

                                        Every semester, I required my environmental science college class to go to your website and browse through your biome maps to find their "home" biome. However, since you now require people to create an account, I have had to direct my students to other, lower quality maps elsewhere. I don't want them to have to spend 5 minutes creating a login just to use the site for few minutes and I certainly don't want them to all have to give up their email address. These are students, not data points.

                                        If the purpose of your site providing information to the…

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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.

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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

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