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Overview

Project website postgis.net/workshops/postgis-intro
Project maintainers User avatar komzpa User avatar dmateos User avatar dkastl User avatar cvvergara User avatar jsanz User avatar andischi User avatar yellow73 User avatar astrid_emde User avatar jef
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Source code repository https://github.com/postgis/postgis-workshops.git
Repository branch master
Last remote commit Merge pull request #140 from ThomasPrioul/patch-2 0a18451
Regina Obe authored 3 weeks ago
Last commit in Weblate Translated using Weblate (Chinese (Simplified)) 9d11918
Wangdapeng authored 20 hours ago
Weblate repository https://weblate.osgeo.org/git/postgis-workshop/index/
File mask postgis-intro/sources/locale/*/LC_MESSAGES/equality.po
Translation file Download postgis-intro/sources/locale/es/LC_MESSAGES/equality.po
Last change March 14, 2025, 5:47 a.m.
Last author None
13 days ago

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Changes committed

  1. postgis-workshop
  2. equality
  3. Spanish
Changes committed 13 days ago
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Translation completed

  1. postgis-workshop
  2. equality
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Translation completed 13 days ago
User avatar paulocoronado

Translation added

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As you can see, all of our spatially equal geometries also have equal bounds. Unfortunately, Polygon 5 is also returned as equal under this test, because it shares the same bounding box as the other geometries. Why is this useful, then? Although this will be covered in detail later, the short answer is that this enables the use of spatial indexing that can quickly reduce huge comparison sets into more manageable blocks when joining or filtering data.
Como puede ver, todas nuestras geometrías espacialmente iguales también tienen límites iguales. Desafortunadamente, el Polígono 5 también se devuelve como igual bajo esta prueba, porque comparte la misma caja delimitadora que las otras geometrías. ¿Por qué es útil? Aunque esto se tratará en detalle más adelante, la respuesta corta es que esto permite el uso de indexación espacial que puede reducir rápidamente enormes conjuntos de comparación en bloques más manejables al unir o filtrar datos.
13 days ago
User avatar paulocoronado

Translation added

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Exact equality requires, in the worst case, comparison of each and every vertex in the geometry to determine equality. This can be slow, and may not be appropriate for comparing huge numbers of geometries. To allow for speedier comparison, the equal bounds operator, :command:`~=`, is provided. This operates only on the bounding box (rectangle), ensuring that the geometries occupy the same two dimensional extent, but not necessarily the same space.
La igualdad exacta requiere, en el peor de los casos, la comparación de todos y cada uno de los vértices de la geometría para determinar la igualdad. Esto puede ser lento, y puede no ser apropiado para comparar un gran número de geometrías. Para permitir una comparación más rápida, se proporciona el operador de límites iguales, :comando:`~=`. Este operador sólo opera en el rectángulo, garantizando que las geometrías ocupan la misma extensión bidimensional, pero no necesariamente el mismo espacio.
13 days ago
User avatar paulocoronado

Translation added

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Equal Bounds
Límites iguales
13 days ago
User avatar paulocoronado

Translation added

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These results are more in line with our intuitive understanding of equality. Polygons 1 through 4 are considered equal, since they enclose the same area. Note that neither the direction of the polygon is drawn, the starting point for defining the polygon, nor the number of points used are important here. What is important is that the polygons contain the same space.
Estos resultados son más acordes con nuestra comprensión intuitiva de la igualdad. Los polígonos 1 a 4 se consideran iguales, ya que encierran la misma área. Observe que ni la dirección en la que se dibuja el polígono, ni el punto de partida para definir el polígono, ni el número de puntos utilizados son importantes aquí. Lo importante es que los polígonos contengan el mismo espacio.
13 days ago
User avatar paulocoronado

Translation added

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As we saw above, exact equality does not take into account the spatial nature of the geometries. There is an function, aptly named :command:`ST_Equals`, available to test the spatial equality or equivalence of geometries.
Como hemos visto anteriormente, la igualdad exacta no tiene en cuenta la naturaleza espacial de las geometrías. Existe una función, acertadamente denominada :command:`ST_Equals`, disponible para comprobar la igualdad o equivalencia espacial de las geometrías.
13 days ago
User avatar paulocoronado

Translation added

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Spatially Equal
Espacialmente igual
13 days ago
User avatar paulocoronado

Translation added

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In this example, the polygons are only equal to themselves, not to other seemingly equivalent polygons (as in the case of Polygons 1 through 3). In the case of Polygons 1, 2, and 3, the vertices are in identical positions but are defined in differing orders. Polygon 4 has colinear (and thus redundant) vertices on the hexagon edges causing inequality with Polygon 1.
En este ejemplo, los polígonos sólo son iguales a sí mismos, no a otros polígonos aparentemente equivalentes (como en el caso de los polígonos 1 a 3). En el caso de los polígonos 1, 2 y 3, los vértices se encuentran en posiciones idénticas, pero están definidos en órdenes diferentes. El polígono 4 tiene vértices colineales (y, por tanto, redundantes) en los bordes del hexágono, lo que provoca una desigualdad con el polígono 1.
13 days ago
User avatar paulocoronado

Translation added

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Exact equality is determined by comparing two geometries, vertex by vertex, in order, to ensure they are identical in position. The following examples show how this method can be limited in its effectiveness.
La igualdad exacta se determina comparando dos geometrías, vértice por vértice, en orden, para asegurarse de que son idénticas en posición. Los siguientes ejemplos muestran cómo este método puede tener una eficacia limitada.
13 days ago
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