[Qgis-user] Group Statistics Tool

[krishna Ayyala]

Nicolas,
Thanks for your reply.They are not multi polygons. They are two
separate polygons. That means A with area 60 is one polygon and A with area
30 is second polygon. If I select one polygon on the map, only one polygon
gets highlighted. But, in group stats ,I have selected the first row which
is A 60. I clicked "Features" and then "Show selected on map" both the
polygons on the map are getting highlighted. As I mentioned before, only
one polygon should get highlighted. If I create a unique id, that will not
serve the purpose. I am trying to derive the polygon with maximum area
from the list of polygons that are labeled as A.

Regards.

On Sun, Jul 18, 2021 at 9:58 AM Nicolas Cadieux <njacadieux.gitlab at gmail.com>
wrote:

> Hi,
>
> I do you have multipolygons in your input files?  If not, perhaps the
> multipolygon is being created because both polygon have the same ID, A.
> Try creating a unique id field to see what is going on.  A multipolygon or
> multipart object will contain multiple polygons but only one data line in
> the data table. You can split multipolygon with a «multiple to single »tool
> found in the vector menu.
>
> Nicolas Cadieux
> https://gitlab.com/njacadieux
>
> Le 17 juill. 2021 à 20:56, krishna Ayyala <ayyalakrishna at gmail.com> a
> écrit :
>
> 
> Hello,
> I have a polygon shape file with an attribute table as shown below.
>
> <image.png>
>
>
> I am using the Group stats tool to derive only those rows that have max
> area for each polygon. After clicking calculate, I got the results below.
> In the below window. I have selected the first row which A 60. I clicked
> "Features" and then "Show selected on map" . Technically, it is supposed to
> highlight only one polygon which is A with an area 60 on the map. But is
> highlighting both the polygons i.e..A with an area 60 and also A with an
> area 30. Is there a way to select only the polygon A with an area 60?
>
> <image.png>
>
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