Comment un point ne peut-il PAS être à l'intérieur ou toucher mais toujours intersecter un polygone?

Je travaille avec des fichiers de formes de recensement (multipolygones) et j'ai un autre tableau avec des points. Nous enregistrons dans quel bloc de recensement chaque point se trouve. J'ai un point qui renvoie faux pour toutes les requêtes ST_Within et ST_Touches. Il retourne cependant vrai pour ST_Intersects sur un bloc.

S'il s'agissait d'un autre polygone, je peux comprendre comment cela se produirait, mais comment un seul point (j'ai vérifié que c'est le cas) peut-il être vrai pour les intersections mais faux pour les deux à l'intérieur et les touches? En l'examinant dans QGis, il semble que cela devrait retourner vrai pour Touches.

Notre table compte des millions de points et seul ce seul point semble poser problème. J'ai exécuté ST_IsValid sur le polygone et le point.

Je suis relativement nouveau dans les données de géométrie. Est-ce que je manque quelque chose sur la façon dont cela fonctionne?

Et le bloc polygonal (géoïde: '170898507021157')

SELECT ST_Within(pt, geom), ST_Touches(pt, geom), ST_Intersects(pt, geom)
FROM ( VALUES
    (
        ST_SetSRID( ST_GeometryFromText($$MULTIPOLYGON(((-88.466933 42.139013,-88.464586 42.139034,-88.463821 42.13901,-88.463811 42.138813,-88.463815 42.138705,-88.46382 42.138572,-88.463849 42.138468,-88.463886 42.138398,-88.464044 42.138452,-88.464239 42.138464,-88.464616 42.138472,-88.464961 42.138468,-88.465318 42.13846,-88.465558 42.138464,-88.465695 42.138443,-88.465824 42.138402,-88.465969 42.138319,-88.466048 42.138248,-88.466106 42.138161,-88.466135 42.138057,-88.466148 42.1379,-88.466149 42.137731,-88.466143 42.137406,-88.466143 42.137086,-88.466131 42.136945,-88.466098 42.13685,-88.466027 42.136746,-88.46596 42.136677,-88.465799 42.136609,-88.465571 42.136559,-88.465359 42.136534,-88.465167 42.136547,-88.464221 42.136559,-88.464216 42.136248,-88.464199 42.13609,-88.464179 42.135999,-88.46412 42.13587,-88.464046 42.135779,-88.463847 42.135597,-88.463531 42.135373,-88.463341 42.135252,-88.46313 42.135068,-88.462915 42.134957,-88.462601 42.134865,-88.462337 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        ST_GeometryFromText('POINT(-88.450000 42.135254)',4326)
    )
) AS t(geom, pt);

postgis indiri
la source

Bienvenue dans GIS SE! En tant que nouvel utilisateur, veuillez faire le tour pour en savoir plus sur notre format de questions / réponses ciblé.

Midavalo

Le point est peut-être sur la ligne entre deux sommets. C'est du moins l'impression que j'obtiens de la documentation d'Esri (intersecte signifie pas disjoint; touche signifie au sommet).

mkennedy

Est-il possible que le point se trouve dans la zone de délimitation d'un multipolygone NS ST_Intersects prend la géométrie de délimitation du multipolygone alors que les autres ne prennent que ce qui se trouve sur les coordonnées exactes de l'entité? Pouvez-vous publier une capture d'écran du point / poly dans QGIS?

DPSSpatial

J'ai un petit problème avec Imgur depuis mon ordinateur portable mais j'ai ajouté la géométrie des deux ci-dessus. Les deux sont SRID 4326

indiri

Whoof, ici je passais en revue la matrice dimensionnellement étendue à 9 intersections (DE-9IM) et je me demandais si je manquais quelque chose. Retourne 0F2FF1FF2ici

Evan Carroll

Réponses:

ST_Within(A,B)vous indique si " Aest à l'intérieur B". Le polygone est-il dans le point? Nan. ST_Contains(A, B)vous indique si " Acontient B" et ce est.

SELECT ST_Within(geom,pt), ST_Contains(geom,pt), ST_Touches(geom,pt), ST_Intersects(geom,pt)
FROM ( VALUES
    (
    ST_SetSRID( ST_GeometryFromText($$MULTIPOLYGON(((-88.466933 42.139013,-88.464586 42.139034,-88.463821 42.13901,-88.463811 42.138813,-88.463815 42.138705,-88.46382 42.138572,-88.463849 42.138468,-88.463886 42.138398,-88.464044 42.138452,-88.464239 42.138464,-88.464616 42.138472,-88.464961 42.138468,-88.465318 42.13846,-88.465558 42.138464,-88.465695 42.138443,-88.465824 42.138402,-88.465969 42.138319,-88.466048 42.138248,-88.466106 42.138161,-88.466135 42.138057,-88.466148 42.1379,-88.466149 42.137731,-88.466143 42.137406,-88.466143 42.137086,-88.466131 42.136945,-88.466098 42.13685,-88.466027 42.136746,-88.46596 42.136677,-88.465799 42.136609,-88.465571 42.136559,-88.465359 42.136534,-88.465167 42.136547,-88.464221 42.136559,-88.464216 42.136248,-88.464199 42.13609,-88.464179 42.135999,-88.46412 42.13587,-88.464046 42.135779,-88.463847 42.135597,-88.463531 42.135373,-88.463341 42.135252,-88.46313 42.135068,-88.462915 42.134957,-88.462601 42.134865,-88.462337 42.134822,-88.461619 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42.134081,-88.45546 42.13408,-88.455658 42.134071,-88.455717 42.13407,-88.455796 42.134076,-88.455874 42.134088,-88.455948 42.134108,-88.45602 42.134134,-88.456046 42.134146,-88.456482 42.134355,-88.457315 42.134739,-88.457836 42.135006,-88.457946 42.134877,-88.458112 42.134687,-88.458204 42.134552,-88.458247 42.134447,-88.458229 42.134374),(-88.452273 42.135697,-88.452285 42.135431,-88.452274 42.135336,-88.452194 42.134994,-88.452165 42.134926,-88.452102 42.134856,-88.452036 42.134814,-88.451952 42.134783,-88.451842 42.134768,-88.450207 42.134731,-88.450045 42.134734,-88.449883 42.134753,-88.449809 42.134767,-88.449989 42.135232,-88.450033 42.13532,-88.450071 42.135375,-88.450125 42.135435,-88.450188 42.135489,-88.450274 42.135547,-88.450379 42.1356,-88.450498 42.135641,-88.450645 42.13567,-88.451787 42.135817,-88.45195 42.135827,-88.452057 42.135822,-88.452288 42.13579,-88.452273 42.135697)))$$), 4326 ),
    ST_GeometryFromText('POINT(-88.450000 42.135254)',4326)
    )
) AS t(geom, pt);

Voici les résultats vus sur mon ordinateur:

 st_within | st_contains | st_touches | st_intersects 
-----------+-------------+------------+---------------
 f         | t           | f          | t

Paul Ramsey
la source

Je faisais ST_Within (point, geom) (est le point dans geom) et il est retourné faux. L'édition ci-dessus a été saisie par quelqu'un de manière incorrecte. Et mon ordinateur le renvoie également faux pour le toucher. J'ai vérifié que le polygone est valide. Si vous devenez fidèle à ST_Touches, pourquoi je ne le fais pas? Tous les blocs ont été importés en même temps (il semble donc peu probable qu'un seul importé soit corrompu?) Et les autres reviennent correctement même lorsque le point ne touche que.

indiri

Eh bien, je reviens à mon commentaire précédent selon lequel vous avez mis au jour une très petite différence entre les implémentations dans GEOS (dans / contient) et PostGIS (intersecte). Le fait que je vois des résultats corrects est probablement le résultat de la transition du binaire au texte et vice-versa, car la différence est si petite que seule cette transformation pourrait l'affecter.

Paul Ramsey

@PaulRamsey Je pense que votre idée originale est liée à un comportement étrange similaire que j'ai vu dans cette question . Dans ce cas, ce sont les fonctions de géométrie QGIS, qui utilisent GEOS sous le capot.

Steven Kay

Je pense donc que votre commentaire est vraiment la réponse ici, mais je vais marquer cela comme terminé. Merci pour l'intuition intéressante!

indiri

Quelques précisions sur cette situation:

Le point ne se trouvent correctement dans le polygone ( à peine)
Parce que le point se trouve à l'intérieur du polygone, ST_Touchesrevient false. (Il reviendrait truesi le point se trouvait exactement sur la frontière du polygone)
Pour moi , en cours d' exécution retourne la requête fournis truepour ST_Within, comme prévu. Cela peut être dû à des différences en virgule flottante sur la plate-forme, ou peut-être à des mises à niveau dans la bibliothèque GEOS.

Donc tout se passe comme prévu.

dr_jts
la source