[R-sig-Geo] Proj4string for NASA GPW v3 and Blue Marble world city light map?

[Shaun Walbridge]

The specific projection information is contained within the raster
datasets you download, in the related ASCII, Bil or GRID file. The
metadata you see on that page is just a human readable representation of
the data coverage, not intended to directly map to the full spatial
reference.

-- 
Shaun Walbridge
GIS Developer




On 5/7/15, 5:15 AM, "Ziyu Ma" <paul.ziyu.ma at gmail.com> wrote:

>Dear all,
>
>I was working with a project concerning human population, using data from
>the Population Density Grid, version 3.
>
>I have hard time understanding the spatial reference from this metadata
>page:
>
>http://sedac.ciesin.columbia.edu/data/set/gpw-v3-population-density/metada
>ta
>
>Can I translate this into a proj4string so that I can use it as a CRS in
>R?
>
>Also, just out of curiosity, what it the spatial reference for NASA's Blue
>Marble maps, like the famous world city light map? Can I also use a
>proj4string to describe it?
>
>Thank you very much.
>
>Cheers,
>Ma
>
>Ziyu Ma
>PhD Student
>Ecoinformatics & Biodiversity,
>Department of Bioscience, Aarhus University
>Ny Munkegade 114, DK-8000 Aarhus C, Denmark
>
>	[[alternative HTML version deleted]]
>
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