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Overview

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 Update README.md with formatting f6c7aa6
Martin Davis authored 4 days ago
Last commit in Weblate Translated using Weblate (Spanish) 60517ef
juan sebastian jimenez aldana authored 6 hours 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/sv/LC_MESSAGES/rasters.po
Last change June 17, 2025, 9:48 a.m.
Last author None
10 days ago

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Translated 100% 209 100% 5,958 100% 38,078
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Failing checks 1% 4 1% 113 1% 694
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Untranslated strings 0% 0 0% 0 0% 0
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Changes committed 4 months ago
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PostGIS raster comes packaged with a number of functions for editing rasters. These functions are both used for editing as well as creating derivative raster data sets. You will find these listed in `Raster Editors <https://postgis.net/docs/RT_reference.html#Raster_Editors>`_ and `Raster Management <https://postgis.net/docs/RT_reference.html#Raster_Management_Functions>`_.
PostGIS raster levereras med ett antal funktioner för att redigera raster. Dessa funktioner används både för att redigera och för att skapa derivata rasterdatauppsättningar. Du hittar dessa listade i `Raster Editors-redigerare <https://postgis.net/docs/RT_reference.html#Raster_Editors>`_ och `Raster Management <https://postgis.net/docs/RT_reference.html#Raster_Management_Functions>`_.
4 months ago
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If this were a classification scheme we preferred, we could create a new table using the ST_Reclass to recompute each tile.
Om det här var ett klassificeringssystem som vi föredrog skulle vi kunna skapa en ny tabell med ST_Reclass för att räkna om varje brickplatta.
4 months ago
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Translation changed

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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.
Overview-faktorn anger vilken upplösning raden har i förhållande till sin överordnade enhet. En `overview_factor` på `2` innebär att 2x2 = 4 brickplattor får plats på en overview_2-brickplatta. På samma sätt innebär en overview_factor på `3` att 2x2x2 = 8 brickplattor av originalet kan tryckas in i en overview_3-brickplatta.
4 months ago
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A better approach, albeit a bit slower, is to define your own coverage tile structure from scratch using `ST_MakeEmptyCoverage <https://postgis.net/docs/RT_ST_MakeEmptyCoverage.html>`_ and then find the intersecting tiles for each new tile, and ST_Union these and then use `ST_Transform(ref, ST_Union...)` to create each tile.
Ett bättre tillvägagångssätt, om än lite långsammare, är att definiera din egen täckningsstruktur från början med `ST_MakeEmptyCoverage <https://postgis.net/docs/RT_ST_MakeEmptyCoverage.html>`_ och sedan hitta de korsande plattorna för varje ny kakelplatta, och ST_Union dessa och sedan använda `ST_Transform(ref, ST_Union...)` för att skapa varje kakelplatta.
4 months ago
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Translation replaced

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You'll often hear in PostGIS lingo, the term **raster tile** and **raster** used somewhat interchangeably. A raster tile really corresponds to a particular raster in a raster column which is a subset of a bigger raster, such as this NYC dem data we just loaded. This is because when rasters are loaded into PostGIS from big raster files, they chopped into many rows to make them manageable. Each raster in each row then is a part of a bigger raster. Each tile covers same size area denoted by the blocksize you specified. Rasters are sadly limited by the 1GB PostgreSQL `TOAST <https://www.postgresql.org/docs/current/storage-toast.html>`_ limit and also the slow process of detoasting and so we need to chop up in order to achieve decent performance or to even store them.
I PostGIS-lingo används ofta termerna **raster tile** och **raster** omväxlande. En rasterplatta motsvarar egentligen ett visst raster i en rasterkolumn som är en delmängd av ett större raster, till exempel NYC dem-data som vi just laddade. Detta beror på att när raster laddas in i PostGIS från stora rasterfiler, hackas de i många rader för att göra dem hanterbara. Varje raster i varje rad är då en del av ett större raster. Varje kakelplatta täcker samma storlek på området som anges av den blockstorlek du angav. Rasters är tyvärr begränsade av 1 GB PostgreSQL `TOAST <https://www.postgresql.org/docs/current/storage-toast.html>`_-gränsen och även den långsamma processen med detoasting och så måste vi hugga upp för att uppnå anständig prestanda eller till och med lagra dem.
4 months ago
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`raster2pgsql <https://postgis.net/docs/using_raster_dataman.html#RT_Raster_Loader>`_ is a command-line tool often packaged with PostGIS. If you are on windows and used application stackbuilder PostGIS Bundle, you'll find :command:`raster2pgsql.exe` in the folder ``C:\Program Files\PostgreSQL\15\bin`` where the *15* should be replaced with the version of PostgreSQL you are running.
`raster2pgsql <https://postgis.net/docs/using_raster_dataman.html#RT_Raster_Loader>`_ är ett kommandoradsverktyg som ofta paketeras med PostGIS. Om du är på Windows och använde applikationsstackbuilder PostGIS Bundle, hittar du :command:`raster2pgsql.exe` i mappen `` C: \ Program Files \ PostgreSQL \ 15 \ bin`` där * 15 * ska ersättas med den version av PostgreSQL du kör.
4 months ago
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Translation changed

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Loading Rasters using raster2pgsql
Laddaäs in raster med hjälp av raster2pgsql
4 months ago
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