The first thing I did was set up the enviroment. This is:

1. Install PostgreSQL 8.3 using apt-get (Debian rulez )
2. Checkout the last version of PROJ.4 (required by PostGIS) from svn by svn checkout http://svn.osgeo.org/metacrs/proj/trunk/proj, and compile it
3. Checkout the last version of GEOS (required by PostGIS) from svn by svn checkout http://svn.osgeo.org/geos/trunk geos-svn, and compile it
4. Checkout the last version of PostGIS from svn by svn checkout http://svn.osgeo.org/postgis/trunk postgis-svn, and compile it
5. Checkout the last version of WKT Raster from svn by svn checkout https://svn.osgeo.org/postgis/spike/wktraster, and compile it
6. Export the last version of GDAL from svn by svn export https://svn.osgeo.org/gdal/trunk/gdal gdal, and compile it

EDIT 2009/06/18: I exported the code from GDAL, instead of checkout it.  I’m going to import my own version of GDAL, with the WKT Raster, in a different svn repository.

EDIT 2009/11/18: I added this in other post, but here is more useful: After install everything, add the libgdal.so directory (/usr/local/lib) to /etc/ld.so.conf and execute

sudo ldconfig

So, after that, I’ve installed:

• PostreSQL v8.3.
• PostGIS v1.4.0SVN. I created gsoc09_test database and added spatial capabilities.
• WKT Raster v0.1.6SVN[1]. I executed the enabler script in order to enable gsoc09_test database to use the wktraster
• GDAL v1.7.0SVN.

I had two problems, solved, in this process:

When I was running the enabler script to add the PostGIS extension for a given database, I got a message like this:

NOTICE:  type "histogram2d" is not yet defined
DETAIL:  Creating a shell type definition.

And I got a similar message while running the enabler script to add wktraster support to my spatial database. But I found the solution here: It’s a hen-an-egg problem. Only a warning, not an error.

My second problem was with PostGIS testing. I had to install cunit, but as I installed PostGIS before, I had to execute PostGIS ./configure again, and then do the make check. Everything worked fine.

With the enviroment ready, It was the time to read again a lot of documentation. I read:

• WKT Raster project presentation [PDF - 2.5MB]
• Libpq specification
• GDAL Driver implementation tutorial

Then, I had a look at the code of some drivers, and I stopped at the PNG driver. Maybe it could be a starting point…

For next week, I plan to start coding the skel of my own GDAL driver. A dummy driver, at first.  And I’d like to have a sandbox svn access. This issue is being discussed here and here

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There was a little confusion with the version number.

Hello everybody,

This is the blog of a Computer Science Engineer, and a student, at same time.  I’m very interested in GIS and Open Source. My goal is to learn as such new and exciting things as I can, and share them, of course. For this reason, I enrolled in GSoC 2009

So, let’s go…