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Project website postgis.net/workshops/postgis-intro
Project maintainers User avatar komzpa User avatar jef User avatar cvvergara User avatar yellow73 User avatar astrid_emde User avatar dmateos User avatar dkastl User avatar jsanz User avatar andischi
Translation license Creative Commons Attribution 3.0 United States
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Source code repository https://github.com/postgis/postgis-workshops.git
Repository branch master
Last remote commit Merge pull request #156 from rozhnev/master 8372e77
Darafei Praliaskouski authored 19 hours ago
Last commit in Weblate Translated using Weblate (Spanish) 60517ef
juan sebastian jimenez aldana authored 2 days ago
Weblate repository https://weblate.osgeo.org/git/postgis-workshop/index/
File mask postgis-intro/sources/locale/*/LC_MESSAGES/rasters.po
Translation file Download postgis-intro/sources/locale/de/LC_MESSAGES/rasters.po
Last change Nov. 2, 2024, 10:35 p.m.
Last author None
13 days ago

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Strings with suggestions 1% 2 1% 2 1% 22
Untranslated strings 100% 209 100% 5,958 100% 38,078
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Resource updated

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The "postgis-intro/sources/locale/de/LC_MESSAGES/rasters.po" file was changed. 11 months ago
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People have the habit of jumping to :command:`ST_MapAlgebra`, probably because the name sounds so cool and sophisticated. Who wouldn't want to tell their friends? *I'm using a function called ST_MapAlgebra.* My advice, explore other functions before you pull out that shotgun. Your life will be simpler and your performance will be 100 times better, and your code will be shorter.
 
11 months ago
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Map algebra is the idea that you can do math on your pixel values. The :command:`ST_Union` and :command:`ST_Intersection` functions covered earlier are a special fast case of map algebra. Then there are the `ST_MapAlgebra <https://postgis.net/docs/RT_ST_MapAlgebra.html>`_ family of functions which allow you to define your own crazy math, but at cost of performance.
 
11 months ago
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By default ST_Clip will leave out pixels where the centroid of the pixel doesn't intersect the geometry. This can be annoying for big pixels and you may prefer to instead, include a pixel if any part of the pixel touches the geometry. Introduced in PostGIS 3.5, is the touched argument. Replace your `ST_Clip(r.rast, g.geom)` with `ST_Clip(r.rast, g.geom, touched => true)` and voila any pixels that intersect your geometry in any way will be included.
 
11 months ago
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The `overview_factor` tells you at what resolution the row is with respect to it's parent. An `overview_factor` of `2` means that 2x2 = 4 tiles can fit into one overview_2 tile. Similarly an overview_factor of `3` meants that 2x2x2 = 8 tiles of the original can be shoved into an overview_3 tile.
 
11 months ago
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The :command:`raster2pgsql` tool is similar to the :command:`shp2gpsql` except instead of loading ESRI shapefiles into PostGIS geometry/geography tables, it loads any GDAL supported raster format into raster tables. Just like :command:`shp2pgsql` you can pass it a spatial reference id (SRID) of the source. Unlike :command:`shp2pgsql` it can infer the spatial references system of the source data if your source data has suitable metadata.
 
11 months ago
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ST_Histogram
ST_Histogram
2 years ago
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Statistics
Statistik
2 years ago
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Resource updated

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The "postgis-intro/sources/locale/de/LC_MESSAGES/rasters.po" file was changed. 2 years ago
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String updated in the repository

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The only problem with the aforementioned :command:`ST_Transform` approach is that when you transform, the transformed often exists in other tiles. If you looked at the above output closely enough by outputting the convex hull of the rasters, in the next example you'd see annoying overlaps around the borders.
 
2 years ago
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