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Summary

Project website postgis.net/workshops/postgis-intro
Project maintainers9 User avatar cvvergaraUser avatar dkastlUser avatar komzpaUser avatar astrid_emdeUser avatar dmateosUser avatar jsanzUser avatar andischiUser avatar jefUser avatar yellow73
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Source code repository https://github.com/postgis/postgis-workshops.git
Repository branch master
Last remote commit Update sql cheat sheet with makevalid example 5f99414
Paul Ramsey authored 10/30/2025
Last commit in Weblate Translated using Weblate (Spanish) d58b65f
Weblate authored 09/26/2025
Weblate repository https://weblate.osgeo.org/git/postgis-workshop/index/
File mask postgis-intro/sources/locale/*/LC_MESSAGES/validity.po
Translation file Download postgis-intro/sources/locale/es/LC_MESSAGES/validity.po
Last change Sept. 26, 2025, 6:54 a.m.
Last change made by None
Language Spanish
Language code es
Text direction Left to right
Case sensitivity Case-sensitive
Number of speakers 507,599,381
Number of plurals 2
Plural type One/other
Plurals Singular 1
Plural 0, 2, 3, 4, 5, 6, 7, 8, 9, 10, …
Plural formula n != 1
02/10/2026

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Total 34 797 5,076
Translated 100% 34 100% 797 100% 5,076
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Failing checks 0% 0 0% 0 0% 0
Strings with suggestions 0% 0 0% 0 0% 0
Untranslated strings 0% 0 0% 0 0% 0
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User avatar robe

Changes committed
Changes committed 09/26/2025
User avatar robe

Translation changed
What's going on here? The algorithm that calculates area assumes that rings do not self-intersect. A well-behaved ring will always have the area that is bounded (the interior) on one side of the bounding line (it doesn't matter which side, just that it is on *one* side). However, in our (poorly behaved) figure-eight, the bounded area is to the right of the line for one lobe and to the left for the other. This causes the areas calculated for each lobe to cancel out (one comes out as 1, the other as -1) hence the "zero area" result.
¿Qué ocurre aquí? El algoritmo que calcula el área asume que los anillos no se auto-intersecan. Un anillo que se comporte bien siempre tendrá el área delimitada (el interior) a un lado de la línea de delimitación (no importa a qué lado, sólo que sea a *un* lado). Sin embargo, en nuestro (mal comportamiento) ocho, el área delimitada está a la derecha de la línea para un lóbulo y a la izquierda para el otro. Esto hace que las áreas calculadas para cada lóbulo se anulen (una sale como 1, la otra como -1), de ahí el resultado de «"área cero»".
09/26/2025
User avatar robe

Translation changed
The outer ring is actually a figure-eight, with a self-intersection in the middle. Note that the graphic routines successfully render the polygon fill, so that visually it is appears to be an "area": two one-unit squares, so a total area of two units of area.
El anillo exterior es en realidad una figura de ocho, con una auto-intersección en el centro. Obsérvese que las rutinas gráficas representan correctamente el relleno del polígono, de modo que visualmente parece un «"área»": dos cuadrados de una unidad, es decir, un área total de dos unidades de área.
09/26/2025
User avatar robe

Translation changed
In 90% of the cases the answer to the question, "why is my query giving me a 'TopologyException' error" is "one or more of the inputs are invalid". Which begs the question: what does it mean to be invalid, and why should we care?
En el 90% de los casos, la respuesta a la pregunta «"¿por qué mi consulta da un error “'TopologyException”?»'?" es «"una o varias de las entradas no son válidas»". Lo que nos lleva a preguntarnos: ¿qué significa que no sea válida y por qué debería importarnos?
09/26/2025
User avatar None

Changes committed
Changes committed 09/04/2025
User avatar paulo

Translation changed
What is Validity
¿Qué es la Validez?
09/04/2025
User avatar None

Changes committed
Changes committed 08/31/2025
User avatar paulo

Translation completed
Translation completed 08/31/2025
User avatar paulo

Translation added
`ST_MakeValid(geometry A) <http://postgis.net/docs/ST_MakeValid.html>`_: Returns a geometry re-constructed to obey the validity rules.
`ST_MakeValid(geometry A) <http://postgis.net/docs/ST_MakeValid.html>`_: Devuelve una geometría reconstruida para cumplir con las reglas de validez.
08/31/2025
User avatar paulo

Translation added
`ST_IsValidReason(geometry A) <http://postgis.net/docs/ST_IsValidReason.html>`_: Returns a text string with the reason for the invalidity and a coordinate of invalidity.
`ST_IsValidReason(geometry A) <http://postgis.net/docs/ST_IsValidReason.html>`_: Devuelve una cadena de texto con la razón de la invalidez y una coordenada de invalidez.
08/31/2025
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