[GRASS-user] boundary vs area in wx0

[Dave Roberts]

Thanks Helmut.  v.build did not help, as the topology was already OK. 
The problem seems to be that the database has come unconnected.  To make 
a long story short

1) I used v.in.ogr on a GDB directory, which produced a single feature 
with 20 layers, only a few of which had spatial data

2) to isolate the one element I was most interested in I did a v.extract 
on layer 20 to create the new map.

3) that worked, except that the database was still attached to layer 20, 
even though the new map only had a single layer.  So,

4) I did a v.db.connect -d layer=20, followed by a v.db.connect layer=1 
on the same table that used to be attached to layer 20.

Now, d.vect newveg doesn't work, but d.vect newveg layer=20 does, and 
the query returns layer 20 results, but layer 20 is no longer attached 
to a table in sqlite so all I get are area and cat.    Presumably, some 
permutation of v.category will straighten all of this out.

    In the meantime, I discovered that I could import layers from a GDB 
individually with v.in.ogr, so all is well.

Dave

On 10/12/16 14:33, Helmut Kudrnovsky wrote:
> Dave Roberts wrote
>> I'm having difficulty getting the wx devices to show vector features.
>> For example, I have a map called newveg.  v.info clearly shows that
>> newveg has areas, e.g.
>>
>> Number of points:  0         Number of centroids:  38183
>> Number of lines:   0         Number of boundaries: 97451
>> Number of areas:   38183     Number of islands:    7112
>>
>> If I enter
>>
>> d.vect newveg
>>
>> it doesn't render anything.  If I enter
>>
>> d.vect newveg type=area
>>
>> it doesn't render anything, but if I enter
>>
>> d.vect newveg type=boundary
>>
>> I get the boundaries.  Furthermore, even when it doesn't draw anything,
>> the query tool returns information on polygons I can't see.
>> Unfortunately, even though
>>
>> v.db.connect -p newveg
>>
>> says
>>
>> Vector map
>> <newveg>
>>  is connected by:
>> layer <1/newveg> table
>> <newveg>
>>  in database
>> </home/dvrbts/grass/romo_gdb/PERMANENT/sqlite/sqlite.db> through
>> driver
>> <sqlite>
>>  with key
>> <cat>
>> The query tool is returning information on layer 20 that is no longer
>> connected to newveg (it was once upon a time).
>>
>> I'm confused
>>
>> Dave
>>
>> GRASS 7.3.svn, Linux magicsam 4.6.2-1-ARCH #1 SMP PREEMPT Wed Jun 8
>> 08:40:59 CEST 2016 x86_64 GNU/Linux
>
> tested here with
>
> Number of areas:     989768
>
> rendering takes some time, after finished rendering areas are displayed
> without any problem.
>
> try to rebuild topology by eg. v.build map=yourvector
>
>
>
> -----
> best regards
> Helmut
> --
> View this message in context: http://osgeo-org.1560.x6.nabble.com/boundary-vs-area-in-wx0-tp5290472p5290487.html
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-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
David W. Roberts                                     office 406-994-4548
Professor and Head                                      FAX 406-994-3190
Department of Ecology                         email droberts at montana.edu
Montana State University
Bozeman, MT 59717-3460