[ gpsdrive ] .gpx conversion

[Hamish]

Guenther Meyer wrote:
> if the charts can be fetched from a http or ftp server, and can be
> provided in our 1280x1024 format, they could be included very easily.
> if some more processing is necessary, this should be done in an external 
> module.

i.e. use GDAL 1.5+'s WMS import tool. Setup is via a XML file where you
say you want lat/lon WGS84 (epsg code 4326), 1280x1024, image format = PNG,
etc. gpsfetchmap.pl's OnEarth section already does some WMS server stuff
I think. It's a pain to do*, so if we can have something else fetch the
data for us all the better.
[*] some servers don't like http POST method, and fail in weird ways if you try

I now notice that the code allows you to define map_koords.txt with map
corner coords instead of center + scale factor. This is a very good
thing wrt getting data from WMS/external GIS. I will test and document
it in the man page once I figure it all out.


wrt internal GDAL support, unfortunately lib_map/ has hardly any code
comments at all, so I am having a slow time following it.
And Documentation/README.lib_map's world file method seems strange to me.


Hamish