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Project website postgis.net/workshops/postgis-intro
Project maintainers User avatar jsanz User avatar komzpa User avatar dmateos User avatar yellow73 User avatar dkastl User avatar cvvergara User avatar andischi User avatar astrid_emde User avatar jef
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 #120 from osgeoweblate/weblate-postgis-workshop-index 75182f2
Regina Obe authored 3 weeks ago
Last commit in Weblate Translated using Weblate (Chinese (Simplified)) 111cbcd
Zuochenwei authored a month 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/es/LC_MESSAGES/rasters.po
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5 days ago

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Untranslated strings 100% 208 100% 5,884 100% 37,618
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The "postgis-intro/sources/locale/es/LC_MESSAGES/rasters.po" file was changed. a year ago
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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.
 
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The "postgis-intro/sources/locale/es/LC_MESSAGES/rasters.po" file was changed. a year ago
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The bluer the color the lower the elevation and the redder the color the higher the elevation.
 
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Which looks like:
 
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This example takes about 1 second to return 2444 rows. If you used :command:`ST_Intersects` instead of :command:`&&`, the process would take about 3 seconds. The reason `ST_Intersects` is slower is that it performs an additional recheck in some cases a pixel by pixel check. If you expect all your points to be represented with data in your raster set and your rasters represent a coverage (a continguous set non-overlapping raster tiles), then `&&` is generally a speedier option.
 
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Finally you need :command:`ST_Intersects` or :command:`&&` to zoom in on the raster tiles that contain your areas of interest. The `&&` operator, is a faster process than the `ST_Intersects`. Both can take advantage of raster spatial indexes. We'll cover these bread and butter functions first before moving on to other sections where we will use them in concert with other raster and geometry functions.
 
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You need a function like :command:`ST_Union` to reconstitute a region. Because performance gets slow, the more pixels a function needs to analyse, you need a fast acting function :command:`ST_Clip` to clip the rasters to just the portions of interest for your analysis.
 
a year ago
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