June 2005
Intermediate to advanced
568 pages
24h 7m
English
Content preview from Mapping Hacks
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Chapter 6, Mapping on Your Desktop
#76 Explore the Effects of Global Warming
HACK
Adding Population Data into the Mix
At last, we return to our second question: how many people in Western
Europe might be affected by a 10-meter rise in global sea level? To answer
this, we will need to import a layer containing population data, which we
can combine with our elevation layers to begin making estimates. The
“Gridded Population Map of the World,” offered by Colombia University’s
Center for International Earth Information Science Network at http://sedac.
ciesin.org/plue/gpw/, is an excellent source of global population data. Down-
load the binary version of their most recent adjusted population data for
Europe (from 1995, as of this writing) from ftp://ftp.ciesin.org/pub/gpw/
europe/v2eup95agi.zip and unpack it into your working directory. Inside
you’ll find another BIL data set, which, in principle, should be imported into
GRASS in the same fashion as the elevation data we imported earlier:
GRASS 5.7.0:~/climate > unzip v2eup95agi.zip
Archive: v2eup95agi.zip
inflating: eup95agi.bil
inflating: eup95agi.blw
inflating: eup95agi.hdr
extracting: eup95agi.stx
inflating: readme.txt
However, in practice, the GDAL driver has no way to distinguish between
32-bit floating point values and the 32-bit integers actually stored in the BIL
file, due to a bug in the BIL format specification. There are two ways around ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.