[GRASS-user] Problem with v.out.ogr?

[Markus Metz]

If this happens with GRASS 6.x, I think the expected output can be
obtained by adding the -c flag: Export features with category
(labeled) only. Otherwise all features are exported

 v.out.ogr type=line input=esw_g26a format=KML dsn=main.kml layer=7 -c

The meaning of the -c flag has been reverted in GRASS 7 to avoid cases
like these.

Markus M


On Mon, Apr 30, 2012 at 10:28 AM, Moritz Lennert
<mlennert at club.worldonline.be> wrote:
> On 28/04/12 10:35, Micha Silver wrote:
>>
>>
>>
>> On 28/04/2012 00:54, Asher Hoskins wrote:
>>
>>> Hello.
>>>
>>> I've got a map with multiple layers that was originally created from a
>>> DXF file (via v.in.dxf). I want to output a single layer as a KML file
>>> so that it can be loaded into Google Earth (for a non-Grass user) but
>>> when I do:
>>>
>>>  v.out.ogr type=line input=esw_g26a format=KML dsn=main.kml layer=7
>>>
>>> I get all layers output, not just layer 7.
>>>
>>> Am I doing something silly here?
>>
>>
>>
>> Not silly, but maybe not what you expect.
>>
>> Layers are database links, so you could very well have a vector with 7
>> layers, where all the geographic features, are in all the layers.
>> Choosing a certain layer mean choosing which attribute table is
>> connected to the features, but not necessarily which features.
>
>
> That is not completely true: layers are not connections to attribute tables,
> but a means of allowing different (thematic) identifications of the same
> features in a vector map. You can optionally link each layer to an attribute
> table. Whether a feature exists in a layer or not is determined by whether
> that feature has a category value in that layer.
>
> See the recently revised vector intro in the docs for more info [1].
>
> When you display the map, chosing to display only layer 7, what do you see ?
> And what does v.category option=report give you ?
>
> Moritz
>
> [1] http://grass.fbk.eu/grass64/manuals/html64_user/vectorintro.html
>
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