[GRASS-user] nearest point to a line
malte at perlomat.de
Sun Mar 14 16:04:56 EDT 2010
yes, the -a flag did the trick.
Am 14.03.2010 um 20:36 schrieb Richard Chirgwin:
>> Message: 3
>> Date: Sat, 13 Mar 2010 21:04:26 +0100
>> From: Malte Martin <malte at perlomat.de>
>> Subject: [GRASS-user] nearest point to a line
>> To: grass-user at lists.osgeo.org
>> Message-ID: <5F3C1CB5-3E88-4C31-8379-8740F88CB001 at perlomat.de>
>> Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
>> Hi Grass users!
>> After a few years without GRASS I'm starting to work with GRASS
>> again. And of course I have some problems or better questions if
>> GRASS will fit my needs.
>> I have to find the nearest point to a line. I think v.distance wil
>> do the trick but I'm a little bit confused. My idea is using
>> v.distance with a threshold. The output should be a table with the
>> point number or better point designation, the distance and the
>> designation of the line. So I'll be able to sort the table with
>> the minimum distance of each line. But I'm "lost in documentation"
>> somehow. It would be great if someone could give me a short hint.
>> How can I get the output (of course the desginations are
>> attributes of the sites and lines).
>> Thanks in advance!
>> Malte Martin
> v.distance using the -a flag allows you to specify an output table.
> In the output table, from_cat is created automatically. Specify
> upload=cat column=to_cat will capture the to-category.
> Unfortunately, for me anyhow, if I use upload=cat,attr and
> column=to_cat,<attribute name> it fails - but you can use the
> from_cat and to_cat to populate other database columns in the db
> instead of Grass.
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