On 23/04/09 06:19, [email protected] wrote:
Hi All,
It is a novice question, I want to know how is the PostGreSQL used in
GRASS. My initial thought was that it stores the map attributes and
spatial information in PostGreSQL or similar databases. On the other
hand I also feel the dataset which GRASS uses to store map information
(raster/vector) has all the spatial information. I can use a dataset and
use in on any other system installation without copying anything from
database.
GRASS stores the geometries (i.e. the "spatial" information) internally
with an identifier (called category). You can then link these geometries
to attributes which can be stored in any of the supported DB backends,
i.e. DBF files, SQLite, PostgreSQL, MySQL or any database accessible via
ODBC.
Please read http://grass.itc.it/grass63/manuals/html63_user/vectorintro.html
and
http://grass.itc.it/grass63/manuals/html63_user/sql.html
Moritz
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