They also have this page:
On Thu, May 7, 2015 at 11:11 AM, Shaun Walbridge <SWalbridge at esri.com>
wrote:
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
the Population Density Grid, version 3.
I have hard time understanding the spatial reference from this metadata
page:
ta
Can I translate this into a proj4string so that I can use it as a CRS
R?
Also, just out of curiosity, what it the spatial reference for NASA's
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