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  1. 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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  2. polygon shapefiles for GPWv4 National Identifier Grid

    Hello, I'm hoping to be able to download the raster for the polygon shapefiles for the GPWv4 National Identifier Grid. The page says, "Rasters of all resolutions were also converted to polygon shapefiles." Thanks.

    1 vote
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  3. I need numerical time-series data from NASA world maps

    I plot the data of systemic indicators and by isolating the periods of regular proportional change I identify the periods of emergent system transformation.

    1 vote
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  4. 1 vote
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  5. Update old Lotus 1-2-3 spreadsheets to .csv files

    http://sedac.ciesin.columbia.edu/data/set/cddc-china-agricultural-stats-1949-1990

    This dataset is in Lotus 1-2-3 format which is unreadable with modern software. Please could you update this to a future-proof CSV format?

    Thanks
    Dan

    1 vote
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  6. numeric data for impervious surface areas

    I was looking at: -- Global Man-made Impervious Surface (GMIS) Dataset From Landsat, v1 (2010) -- But could find no table of numeric values. I was actually looking for time series of numeric values as a proxy for global habitat loss.

    I'll look for the "footprint data" and "Nighttime Lights data", but suspect there may be no tables of numeric data for those too. I don't have the expertise to extract it. If I wanted to get time series for the global totals for these how would I get it?

    1 vote
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  7. 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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  8. 1 vote
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  9. 1 vote
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  10. Description error

    On page http://sedac.ciesin.columbia.edu/data/set/sdei-global-annual-avg-pm2-5-2001-2010
    It says that 30 arc-mins is aprox 50 sq. km is wrong. You need to remove the sq.

    30 arc-mins is aprox 50 km at the equator.

    1 vote
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  11. Make it mobile / cell friendly

    On Android (not in desktop mode), I can activate neither the poly nor radius icon.

    Please also add a (link to a) help file. Thx, A

    1 vote
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  12. Mangrove data errors

    Many of the mangrove rasters are empty.

    1 vote
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  13. error in your maps -----CORRECT THIS MAP

    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

    1 vote
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  14. SEDAC RSS feed is broken?

    You have an RSS icon on your main page that links to http://ciesin.columbia.edu/rest/rss/sedacnews, but the page says "Sorry... Page Not Found".

    ???

    1 vote
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  15. '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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  16. 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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  17. 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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  18. 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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  19. 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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  20. 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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