Hi Andre:
On 09/22/2012 03:17 PM, Andre Joost wrote:
Am
22.09.2012 13:47, schrieb Micha Silver:
On 09/22/2012 10:27 AM, Andre Joost wrote:
Am 22.09.2012 09:17, schrieb Johan
Nilsson:
There is another thing with 'Personal
geodatabase' and that is that ESRI
don't recommend to use it in their documentation because it
slow and get
really slow if they are bigger and the absolute size are
limited.
Yes, that's true. Spatial index will not be possible on MDBs
(as well as on
spataialite). But MS Access is widely spread, so a connection
would be highly
appreciated. And MDBs are easily portable (again, as well as
spatialite).
Thats a great advantage to Postgis.
I'm not sure I understood your comment, but spatial indexing is
definitely
supported in Spatialite using the R*Tree structure.
I referred to the spatialite 2.1 manual still first in Google
search.
I learned a lot from:
http://www.gaia-gis.it/spatialite-3.0.0-BETA/spatialite-cookbook/html/rtree.html
Also have a look at these blog posts:
http://northredoubt.com/n/2012/01/18/spatialite-and-spatial-indexes/
http://www.surfaces.co.il/?p=1196
I
guess its not fully supported by the stable Qgis 1.8.0.
In DB Manager, I have an entry Spatial Index, but get an error
"no such module: VirtualSpatialIndex". Qspatialite throws an error
for the same reason, and a message "No spatial index defined".
I have a feeling that QSpatialite is somewhat behind. I'm using
spatialite 3.0 with the spatialite_gui 1.5 and there you have access
to the new format for making use of spatial indexes.
The problem is that, unlike PostGIS, spatial indexes are not used
automatically. After you create a spatial index on a table, you must
then construct your query to make use of it. This is certainly
non-intuitive for "normal people".
Regards,
Micha
I read
that spatialitegui might solve the problem, but I want to work
inside Qgis. So still nothing for "normal" people ;-)
Using Master I get other errors about missing pyspatialite.
Gruß,
André Joost
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--
Micha Silver
GIS Consultant, Arava Development Co.
http://www.surfaces.co.il
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