Hi all,
attached to this message is a simple perl script which queries a WMS server
('GetCapabilities') and build a GDAL XML file. You need to have perl and the
modules HTTP::Lite, Getopt::Long and XML::Simple. On debian/ubuntu, just say
'sudo apt-get install perl-base libxml-simple-perl' to install the two latter
packets. For HTTP::Lite which is not (yet) part of the disto, say 'sudo perl
-MCPAN -e shell' and enter 'install HTTP::Lite'.Then just run the script without args to get a usage info. To get a layers list, call the script with the arg '--base=<url>'. Note: enter the URL *without* the terminating '?'. Example: German Federal State Nordrhein-Westfalen (<http://www.geoserver.nrw.de/gbdaten.html>), DGK5: ./make-gdal-wms.pl --base=http://www.wms.nrw.de/geobasis/adv_dgk5 prints the list of available layers. To create an XML file, specify the layer name, and the size of one pixel in m: ./make-gdal-wms.pl --base=http://www.wms.nrw.de/geobasis/adv_dgk5 --layer=adv_dgk5 --size=0.5 creates an XML file which can be loaded in QLGT. The script is *far* from perfect. Here are some known issues: - The script calls proj as to calculate the width and height of the map rectangle by converting the lat/lon corners to Gauss-Krüger coordinates. Sometimes, this failes, no idea why... maybe someone who knows the details of how to actually call proj can help me to fix this (line 106/107). - The calculated width x height, together with the pixel size, is used to calculate the size of the data window. As to get a images with a proper aspect ratio, some WMS servers seem to need the same value for SizeX and SizeY, others need the 'real' rectangle. I have no clue what I should set there. Just edit the XML file and play with these values. Again, and insight would be appreciated. - The XML::Simple seems to have issues regarding the proper interpretation of utf8/iso-8859 characters. If characters are missing in the output, pipe it through iconv (e.g. the example above through 'iconv -f latin1 -t utf8'). More a cosmetic issue... Any comment, suggestion or improvement/patch will be appreciated! Best, Albrecht.
make-gdal-wms.pl
Description: Perl program
pgpX20TzQKJtp.pgp
Description: PGP signature
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