Sto provando a fare qualche elaborazione su alcuni strati poligonali molto grandi. Tuttavia mi imbatto in vari errori geometrici come:
NOTICE: Ring Self-intersection at or near point 470396.52017068537 141300.52235257279
CONTEXT: PL/pgSQL function st_intersection(geometry,raster,integer) line 10 at RETURN QUERY
SQL function "st_intersection" statement 1
NOTICE: Ring Self-intersection at or near point 504154.61769969884 140782.04115761846
CONTEXT: PL/pgSQL function st_intersection(geometry,raster,integer) line 10 at RETURN QUERY
SQL function "st_intersection" statement 1
NOTICE: Ring Self-intersection at or near point 505255.50242871145 140803.34860398644
CONTEXT: PL/pgSQL function st_intersection(geometry,raster,integer) line 10 at RETURN QUERY
SQL function "st_intersection" statement 1
NOTICE: Ring Self-intersection at or near point 510312.46970004693 141215.29256710084
CONTEXT: PL/pgSQL function st_intersection(geometry,raster,integer) line 10 at RETURN QUERY
SQL function "st_intersection" statement 1
NOTICE: Ring Self-intersection at or near point 510312.46970004693 141215.29256710084
CONTEXT: PL/pgSQL function st_intersection(geometry,raster,integer) line 10 at RETURN QUERY
SQL function "st_intersection" statement 1
NOTICE: Ring Self-intersection at or near point 511839.50335641927 141115.85781738357
CONTEXT: PL/pgSQL function st_intersection(geometry,raster,integer) line 10 at RETURN QUERY
SQL function "st_intersection" statement 1
NOTICE: Ring Self-intersection at or near point 515064.03024010791 140895.68087158105
CONTEXT: PL/pgSQL function st_intersection(geometry,raster,integer) line 10 at RETURN QUERY
SQL function "st_intersection" statement 1
NOTICE: Ring Self-intersection at or near point 519233.18724611058 140881.47590733573
CONTEXT: PL/pgSQL function st_intersection(geometry,raster,integer) line 10 at RETURN QUERY
SQL function "st_intersection" statement 1
NOTICE: Ring Self-intersection at or near point 521072.73011588014 141044.83299615697
CONTEXT: PL/pgSQL function st_intersection(geometry,raster,integer) line 10 at RETURN QUERY
SQL function "st_intersection" statement 1
NOTICE: Ring Self-intersection at or near point 523331.31943088671 141144.26774587421
CONTEXT: PL/pgSQL function st_intersection(geometry,raster,integer) line 10 at RETURN QUERY
SQL function "st_intersection" statement 1
NOTICE: Ring Self-intersection at or near point 523331.31943088671 141144.26774587424
CONTEXT: PL/pgSQL function st_intersection(geometry,raster,integer) line 10 at RETURN QUERY
SQL function "st_intersection" statement 1
NOTICE: Ring Self-intersection at or near point 523395.24176999065 140725.22130063715
CONTEXT: PL/pgSQL function st_intersection(geometry,raster,integer) line 10 at RETURN QUERY
SQL function "st_intersection" statement 1
NOTICE: Ring Self-intersection at or near point 524531.63890961662 140810.45108610913
CONTEXT: PL/pgSQL function st_intersection(geometry,raster,integer) line 10 at RETURN QUERY
SQL function "st_intersection" statement 1
Ho provato la funzione suggerita qui: https://trac.osgeo.org/postgis/wiki/UsersWikiCleanPolygons
per la pulizia delle geometrie, il codice che ho usato è:
UPDATE public.mytable
SET geom=cleangeometry(geom);
Con il risultato:
ERROR: GEOSisSimple: IllegalArgumentException: This method does not support GeometryCollection arguments
e anche
UPDATE public.valid_mytable
SET geom=ST_MakeValid(geom);
Questo funziona, ma solo se cambio prima la mia colonna geometrica in geometria
ALTER TABLE public.mytable ALTER COLUMN geom SET DATA TYPE geometry;
Che poi mi lascia con un tavolo che non funziona più con le altre mie funzioni!
ERROR: Relate Operation called with a LWGEOMCOLLECTION type. This is unsupported.
Ho provato a cambiare le colonne in geometria (MultiPolygon)
ALTER TABLE public.my_table ALTER COLUMN geom IMPOSTA TIPO DATI geometria (MultiPolygon);
Ma questo fallisce
ERROR: Geometry type (GeometryCollection) does not match column type (MultiPolygon)
Ho provato a utilizzare PostGIS in Action (Second Ed) http://www.manning.com/obe/ ma riesco a trovare solo le funzioni per trovare geometrie non valide, ma il mio set di dati è così grande da risolvere manualmente, davvero bisogno di qualcosa che li risolva automaticamente.
Sono stato in grado di isolare i poligoni problema, quando provo ad eseguire ST_MakeValid () ottengo il risultato:
ERROR: Geometry type (GeometryCollection) does not match column type (MultiPolygon)
********** Error **********
ERROR: Geometry type (GeometryCollection) does not match column type (MultiPolygon)
SQL state: 22023
Ho fatto un controllo del tipo sulla mia colonna della geometria e ha detto che il tipo era "MULTIPOLYGON"