[postgis-devel] [PostGIS] #1293: ST_Resize to resize raster tiles

[PostGIS]

#1293: ST_Resize to resize raster tiles
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 Reporter:  robe            |       Owner:  pracine              
     Type:  enhancement     |      Status:  new                  
 Priority:  medium          |   Milestone:  PostGIS Raster Future
Component:  postgis raster  |     Version:  trunk                
 Keywords:                  |  
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 Bborie,

 I'm ticketing what we discussed.  As mentioned, it would be nice to have a
 resize function that provides the similar functionality to gdal_translate
 that can take a percentage reduction or max pixel dimensions.

 e.g.

 what gdal_translate:


 {{{
 gdal_translate -of png -outsize 25% 25% original.png final.png
 gdal_translate -of png -outsize 500 500 original.png final.png

 }

 Currently have to use ST_Resample for this which requires a lot more
 arguments, not to mention it doesn't seem to work for rasters with no srid
 information.

 I'm envisioning the signature would look something like


 {{{
 ST_Resize(rast raster, width text, height text)
 }}}


 where width can be a numeric like '500'  or can be a percentage like '50%'
 which is why I made it text.

 This will make postgis raster useful for both GIS folks and non-GIS folks
 as having an easy function to resize a raster will speed up all kinds of
 analysis.  Like I mentioned, my selfish need is that most of my raster
 projects do not involve objects that fit in a nice spatial reference
 landscape but the analysis functions we've got so far I'm finding very
 useful for those (e.g. image recognition, and just plotting and
 vectorizing non-GIS like things like anatomic parts, or construction
 objects)

-- 
Ticket URL: <http://trac.osgeo.org/postgis/ticket/1293>
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