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86 results found

  1. 'Columbia University' link obstructs the 'search field' in the home page

    This is the 10th time that I try to type-in something in the search box, and the link to Columbia's home page opens up instead. Would it be possible to shift down the search box, so that the links to both CIESIN and Columbia pages do not interfere with searches? Thanks!

    1 vote
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  2. Generate my Own GRID for my country

    Hi,
    I would like to create my own country specific grid based on the population esitmates that are given by census department. Would you be able to help me in this?

    1 vote
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  3. Fiji Population Density GRID

    Hi, Would you be able to describe for me how exactly you converted our current enumeration boundaries to a nation wide grid system. I understand that you created this grid for all the countries in the world i just dont understand how you converted our current enumeration area counts to be reflected in your current GPWv3 system.

    1 vote
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  4. 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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  5. 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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  6. 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!

    9 votes
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  7. 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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  8. 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.

    1 vote
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  9. 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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  10. 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

    1 vote
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  11. 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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    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

  12. 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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  13. 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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  14. 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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  15. 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!

    1 vote
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  16. 1 vote
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  17. 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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  18. 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.

    1 vote
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  19. 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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  20. 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?

    1 vote
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