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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | RE: GISList: New global population density dataset |
| Date: |
12/07/2001 10:34:42 AM |
| From: |
Greg Yetman |
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Hi,
I just wanted to add a few points of clarification on the posting about
the population datasets. There are two: Landscan and Gridded Population
of the World (GPW version 2).
Landscan is a set of grids that estimate population for 30 arc-second grid
cells based on a series of inputs (administrative population, slope, land
cover, night light intensity, and road density). Landscan was produced by
Oak Ridge National Laboratory (ORNL) and is distributed by CIESIN at:
http://sedac.ciesin.columbia.edu/plue/gpw/landscan/
Oak Ridge has a page describing the project at:
http://www.ornl.gov/gist/projects/LandScan/SIMPLE/smaps.htm
CIESIN had no part in creating the Landscan dataset, we just distribute it
for Oak Ridge.
Gridded Population of the World (GPW), version 2, is a set of grids which
estimate population, land area and population density based soley on
administrative population data. GPW, version 2, was produced by CIESIN
and is a new version of what used to be known as the 'Global Demography
Project' or GPW. The grids are at a resolution of 2.5 arc-minutes.
These data are available via:
http://sedac.ciesin.columbia.edu/plue/gpw/
We consider these two datasets complimentary, there is a web page that
compares the two so that you can decide which is most appropriate for your
use, see:
http://sedac.ciesin.columbia.edu/plue/gpw/landscan/specs.html
Finally, there is a list of other data that CIESIN distributes at:
http://www.ciesin.columbia.edu/download_data.html
You should be aware that I do work for CIESIN. If you have any questions,
feel free to contact me.
Regards,
Greg
----------------------------------------------------------------------
Gregory Yetman
Center for International Earth Science Information Network (CIESIN)
Columbia University
URL: http://www.ciesin.columbia.edu/
e-mail: gyetman@ciesin.columbia.edu
tel: (845) 365-8982
----------------------------------------------------------------------
| -----Original Message-----
| From: Dimitri Rotow [mailto:dar@manifold.net
| Sent: Monday, November 26, 2001 21:33
| To: Gislist (E-mail)
| Subject: RE: GISList: New global population density dataset
| What's the URL?
Sorry! I forgot that:
http://sedac.ciesin.org/plue/gpw/landscan/
The entire e-mail is at the bottom.
// Hugo Ahlenius
-------------------------------------------------------------
Hugo Ahlenius E-Mail: hugo@grida.no
Project Officer Phone: +47 3703 5713
UNEP GRID-Arendal Fax: +47 3703 5050
Service box 706, N-4808 Arendal Mobile: +47 9964 7071
Norway WWW: http://www.grida.no
-------------------------------------------------------------
| New global population density dataset:
|
| As a user of the old CIESIN/ORNL Gridded Population of the World 1995
(GPW), I just stumbled upon a new similar dataset, by the same people --
Landscan 2000.
|
|
| This dataset is population density in approx. 1x1 km mapping units, mapped
and assessed using Census data, land cover, elevation, roads and nighttime
lights/satellite imagery.
|
| Earlier global population data (such as GPW) had a patchiness in some
places after the mapping units, after administrative boundaries. This new
dataset avoids that, using a more continous way of data collection.
|
| It states on the download page, in the readme, that the dataset is up for
review, and should be considered pre-release quality -- but it still seems
pretty good (not much competition though).
|
| (Please note that I don't have any affiliation with CIESIN or ORNL)
|
| // Hugo Ahlenius
|
|
| -------------------------------------------------------------
| Hugo Ahlenius E-Mail: hugo@grida.no
| Project Officer Phone: +47 3703 5713
| UNEP GRID-Arendal Fax: +47 3703 5050
| Service box 706, N-4808 Arendal Mobile: +47 9964 7071
| Norway WWW: http://www.grida.no
| ----------------------------------------------------
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