[GRASSLIST:6571] access to raw vector data
andreas.braeu at informatik.uni-jena.de
Wed Apr 20 06:46:19 EDT 2005
Hi Grass list,
I'm working on my diploma thesis "federated access to spatial data in grass
with DB2 udb".
That means: In DB2 udb i will create virtual tables, also called 'nicknames',
and a wrapper that translates queries on these nickname tables to obtain data
from grass. The goal is to integrate several data sources (one source is
grass for example) in db2, that appear to users like "normal database tables"
they can work on. To add spatial functionality to DB2 there exists the "DB2
Spatial Extender", that allows developing GIS-applications using DB2.
The db2-wrapper has to be written in C++. I already studied the Grass-C-API,
generated the docs and now have some questions:
The module I'm going to develop needs to run completely noninteractive. Is
this possible for example for opening a mapset (I didn't find anything in the
Which functions are intended to return the raw vector data? For instance I
want to get all roads from a vector containing roads (in DB2 I'll only type
"select * from road_vector_in_grass"). Attributes for these roads should also
I don't want to:
- use DB2 UDB as another possibility for grass to store data
- access raster data, because of the time limit I only want to have a look on
Aus Hähnel ward jetzt Bräu...sonst ist nix neu!
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