[postgis-users] polygons inside polygon

[paul.malm at lfv.se]

Thank you Marcin!
I’m not sure if I understand you correct. Here is what I tried to do to get the outer most polygons:

Select * from "org" Where "fid" IN(
select distinct on (t1.fid) t1.fid
from "org" t1,"org" t2
where ST_Area(t1.the_geom)>ST_Area(t2.the_geom)
and ST_intersects(t1.the_geom,t2.the_geom)
order by t1.fid,ST_Area(t2.the_geom) desc)
AND "fid" NOT IN (
select distinct on (t1.fid) t2.fid
from "org" t1,"org" t2
where ST_Area(t1.the_geom)>ST_Area(t2.the_geom)
and ST_Intersects(t1.the_geom,t2.the_geom)
order by t1.fid,ST_Area(t2.the_geom) desc);

I’m still getting polygons inside other polygons.
Kind regards,
Paul


Från: postgis-users <postgis-users-bounces at lists.osgeo.org> För Marcin Mionskowski
Skickat: den 30 november 2021 08:40
Till: PostGIS Users Discussion <postgis-users at lists.osgeo.org>
Ämne: Re: [postgis-users] polygons inside polygon


Klicka bara på länkar och öppna bilagor om du litar på avsändaren och vet att innehållet är säkert.
Assuming (1) your problem is not trivial (you have more then one "outer most" polygon) and (2) there can be only one type of spatial relationship (polygons are properly contained https://postgis.net/docs/ST_ContainsProperly.html<https://url11b.mailanyone.net/v1/?m=1mrxkX-0008NY-3a&i=57e1b682&c=E3fbWP_UxOp_aLqY_yLoWpoHnd9en_osfYJj-MVUi5KueBYHM1BjtHCJY7dzm-LB011qRSoveVUqU8Wbo-SQYSOYr9IMVYP063lEVQCr3G9ErfMMDLx0JWLLcyDsdbz4OsKdCpzFuBZU-g6Zf2gdwauTuWm-WmCCd-yXe9BTojKOCWOHXliBKmmUzJm2IMYt21G3fa06qgsJNMVB57og9hfef8SNtdDMCfyM41WFZcL6sAWT7ulje7X4_yE-ywIBR2t6-OHWw7iVq5THHQ_FPz6JAbbD-P0i4FQ6Ze6X30U>) below is my take on this:
select distinct on (t1.id<https://url11b.mailanyone.net/v1/?m=1mrxkX-0008NY-3a&i=57e1b682&c=9KJuH3f7Mex6ks3lu5cPQvny5O6XFhyh-eH6svguvEFAWIQVxt2r_IF0pHeMBwTmQ0XE2xxmCMWnaDbfaMp5XAI5b_Dcd0CClUb5RGp_7jG34xScneDpX0vYGQ4vngdzDwWvGm-5Vrd9D1J_a38Rof5Lup9vwpMo_mGHYNGYu4f1wTbn36eA3P8CNM6_0ioVin4dzKvW5LcIMv9Lun1VjfK4qpwRVaVWuelYCEa3WiGmNGu1zEEv9fA7t7zcNFT0>) t1.id<https://url11b.mailanyone.net/v1/?m=1mrxkX-0008NY-3a&i=57e1b682&c=9KJuH3f7Mex6ks3lu5cPQvny5O6XFhyh-eH6svguvEFAWIQVxt2r_IF0pHeMBwTmQ0XE2xxmCMWnaDbfaMp5XAI5b_Dcd0CClUb5RGp_7jG34xScneDpX0vYGQ4vngdzDwWvGm-5Vrd9D1J_a38Rof5Lup9vwpMo_mGHYNGYu4f1wTbn36eA3P8CNM6_0ioVin4dzKvW5LcIMv9Lun1VjfK4qpwRVaVWuelYCEa3WiGmNGu1zEEv9fA7t7zcNFT0>,t2.id<https://url11b.mailanyone.net/v1/?m=1mrxkX-0008NY-3a&i=57e1b682&c=MB1btGDh1LRWWz9_qH-7fMRyiv5SylMmhNclzuXCnly7_WjBFSzNNi8uoxskAeJ4w4vgf__otNnIlUBwzIcTXhXbUpsTFsuilzyfmYd9zwlz05eB_sxpFqejtXwlOFEeYlEQLMRezJUhez4-Az3YSqWptDxKMQo3xICyLgQ_J7X-Y60pOXOjXiF2bxqaDL7qbXenH7LOd0rsTK8ovDtTM0OQ4EBcMuXDxIvRB7k1Wb5YS5ejXpy-7iOFHBuUUIEB>
from t t1,t t2
where ST_Area(t1.geom)>ST_Area(t2.geom)
and ST_Intersects(t1.geom,t2.geom)
order by t1.id<https://url11b.mailanyone.net/v1/?m=1mrxkX-0008NY-3a&i=57e1b682&c=9KJuH3f7Mex6ks3lu5cPQvny5O6XFhyh-eH6svguvEFAWIQVxt2r_IF0pHeMBwTmQ0XE2xxmCMWnaDbfaMp5XAI5b_Dcd0CClUb5RGp_7jG34xScneDpX0vYGQ4vngdzDwWvGm-5Vrd9D1J_a38Rof5Lup9vwpMo_mGHYNGYu4f1wTbn36eA3P8CNM6_0ioVin4dzKvW5LcIMv9Lun1VjfK4qpwRVaVWuelYCEa3WiGmNGu1zEEv9fA7t7zcNFT0>,ST_Area(t2.geom) desc;
Enclose this in CTE and then just select "outer" polygons based on left column and "inner" based on right column.

wt., 30 lis 2021 o 07:30 <paul.malm at lfv.se<mailto:paul.malm at lfv.se>> napisał(a):


Hi,
I have a polygon layer where polygons are inside other polygons (could be polygons in polygons in polygons…).
I would like to separate them in 2 different layers, one layer with the outer most polygon and one layer with all polygons that has a surrounding polygon.
Is there a smart way to do this in SQL?

Thanks,
Paul
    [1_LFV_svensk_96]
  Paul Malm

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