[GRASS-dev] v.reclass more columns
lucadeluge at gmail.com
Tue May 31 03:38:17 PDT 2016
On 31 May 2016 at 12:22, Moritz Lennert <mlennert at club.worldonline.be> wrote:
> On 31/05/16 11:18, Luca Delucchi wrote:
>> Hi devs,
>> Is it possible to extend the column option in v.reclass to accept more
>> than one column?
> But if you combine several columns, you would have to define rules. And this
> is exactly what the rules parameter is for which let's you define SQL-like
> rules combining as many columns as you want ?
But I would like to use something like a GROUP BY statement, and I
don't know the values of cat in advance, should be this possible?
>> sometimes is really useful to reclass/dissolve using more columns and
>> also it is useful to keep more data in the attribute table.
> The problem is if you combine several features into one category, then which
> attributes should you keep ?
I want to combine several features into one category only if the
attributes are the same, so it should keep all the attributes
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