Hi Markus M,
Thanks, it works. Cooking with gas now.
It is still odd though. It is not just an imprecision I am afraid. When
I said "skinny", I was being modest.
If you look a bit closer, it is not a minor error in import. The map
(and the rest as well) is w=-180 e=-179.999... and north and south are
normal. It should have a global extent.
A bit of additional info: when the location lacks a projection, I don't
have problems.
Anyways, I appreciate the help.
Cheers,
Brian
On 10/31/2011 09:15 AM, Markus Metz wrote:
Helmut Kudrnovsky wrote:
I am importing worldclim .asc files from the ipcc4 simulations
(http://ccafs-climate.org/). These are latlong files with a global
extent. I have compiled grass 6.4.2svn from source on ubuntu 11.10 and
hope that I did everything correctly, according to the wiki.
When importing, here is what I do and what happens:
r.in.gdal -o input="/D/Documents/Spatial_Datasets/Climate/WorldClim/\
hccpr_hadcm3_a2a_2020s_prec_2_5min_asc/prec_10.asc" output="prec_10"
tested here with
http://ccafs-climate.org/data/A2a_2020s/hccpr_hadcm3/hccpr_hadcm3_a2a_2020s_prec_2_5min_asc.zip
gdalinfo hccpr_hadcm3_a2a_2020s_prec_2_5min.asc
Driver: AAIGrid/Arc/Info ASCII Grid
Files: prec_10.asc
Size is 8640, 3600
Coordinate System is `'
Origin = (-180.000000000000000,90.000000000119996)
Pixel Size = (0.041666666666700,-0.041666666666700)
Corner Coordinates:
Upper Left (-180.0000000, 90.0000000)
Lower Left (-180.0000000, -60.0000000)
Upper Right ( 180.0000000, 90.0000000)
Lower Right ( 180.0000000, -60.0000000)
Center ( 0.0000000, 15.0000000)
Band 1 Block=8640x1 Type=Int32, ColorInterp=Undefined
NoData Value=-9999
There is a tiny precision loss:
Origin = (-180.000000000000000,90.000000000119996)
Pixel Size = (0.041666666666700,-0.041666666666700)
should be
Origin = (-180.000000000000000,90.000000000000000)
Pixel Size = (0.041666666666667,-0.041666666666667)
pixel size is now as close as possible to 2.5 min.
This is neither a gdal nor a grass bug, but a bug of the software used
to produce these data.
This can easily be fixed with e.g.
gdal_translate -a_ullr -180 90 180 -60 prec_1.asc prec_1.tif
then import the corrected tif.
HTH,
Markus M
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