[QGIS-Developer] Processing 3.0: Possible change to the Convex Hull algorithm

G. Allegri giohappy at gmail.com
Wed Jun 28 01:23:20 PDT 2017

The best of two (but there would be a bit of overhead for the algorithm):
set them to null as soon as two different values are found, keep the first
encountered value otherwise (all the features with same value).


2017-06-28 10:16 GMT+02:00 Anita Graser <anitagraser at gmx.at>:

> On Wed, Jun 28, 2017 at 9:53 AM, Nyall Dawson <nyall.dawson at gmail.com>
> wrote:
>> Incidentally - how should we handle attributes here (and other similar
>> algorithms)? Take the first feature's attributes? Drop all attributes?
> ​I would take the first feature's attributes because I've seen multiple
> times that input datasets for aggregation algorithms (such as hulls,
> dissolve, ...) are prepared in a way that the result represents a certain
> class, e.g. all points where column "type" value is 'tree'. Why should we
> delete the 'tree' value then ... ​
> Best wishes,
> Anita
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