[GRASS-user] map display query and layers

[Vincent Bain]

Hello Dave,

am I wrong or is your map connected to two distinct tables with the same
key (cat) ? then the behavior you describe may be related to a confusion
on the type of features holding 'cat' values. For exemple in the case of
a polygon map, you need to define which type of object handles cats
(i.e. boundaries or centroids).
Just to check, you can have a look at this wiki entry :
https://grasswiki.osgeo.org/wiki/Vector_Database_Management#GRASS_GIS_vector_management_model

Best,
Vincent.

Le vendredi 30 septembre 2016 à 15:47 -0600, Dave Roberts a écrit :
> d.vect has an option for layer= but I don't get any consistent effect 
> from the query tool in the map display.  For example
> 
> GRASS GIS 7.0.4 > v.db.connect -p fuel
> Vector map <fuel> is connected by:
> layer <1/LAB> table <fuel_1> in database 
> </home/dvrbts/grass/bryce/PERMANENT/sqlite/sqlite.db> through driver 
> <sqlite> with key <cat>
> layer <2/ARC> table <fuel_2> in database 
> </home/dvrbts/grass/bryce/PERMANENT/sqlite/sqlite.db> through driver 
> <sqlite> with key <cat>
> 
> says there two layers to this feature connected to a sqlite database. 
> I'm interested in the data in layer=2, so
> 
> d.vect fuel layer=2
> 
> draws the map correctly, but when I click on polygons I get results from 
> layer 1, not 2.  And sometimes for other maps I get multiple layer 
> results, but often not the one I want.  It may depend on exactly where I 
> click (e.g. nearest a centroid (often invisible) vs a boundary) but it 
> seems more random to me.
> 
> GRASS 7.0.4
> 
> Linux 4.6.2-1-ARCH #1 SMP PREEMPT x86_64 GNU/Linux
> 
> Thanks, Dave
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