Scaling extension should be applied after the projection extension

[Alex Dumitru]

This request:

http://138.201.18.85/tb12/rasdaman/ows?request=GetCoverage&service=WCS&version=2.0.1&coverageId=SFTest&subset=E,http://www.opengis.net/def/crs/EPSG/0/32610(543400,544100)&subset=N,http://www.opengis.net/def/crs/EPSG/0/32610(4175600,4176100)&format=image/tiff&outputcrs=http://www.opengis.net/def/crs/EPSG/0/32610&SCALESIZE=E(950),N(833)

fails with

Error converting WCPS query to rasql query: Grid coverages are not supported in CRS reprojections.

I am assuming the rasql query that is generated is project(scale(..)..). It should be scale(project(..), ..)

[Bang Pham Huu]

The WCPS query

  "for c in (test_sf) return encode( 
   crsTransform( scale(trim(trim(c,
  {N:"http://localhost:8080/def/crs/EPSG/0/32610" (4175600:4176100)}),
  {E:"http://localhost:8080/def/crs/EPSG/0/32610" (543400:544100)}), 
    {E:"CRS:1"(22:971),N:"CRS:1"(125:957)}), 
     { E: " http://www.opengis.net/def/crs/EPSG/0/32610 ", 
       N: " http://www.opengis.net/def/crs/EPSG/0/32610 "  }, {} ), "tiff")"

so it should transform() before scale() as Alex's idea.

[Bang Pham Huu]

btw, I have a question with scale

if (&scalefactor=20.0) then the output size is bigger as 20 times or lower as 20 times ? current it is lower.

e.g: coverage size (200 x 200) then with scalefactor, output is 10x10.

[Dimitar Misev]

Please look at the standard.

[Bang Pham Huu]

Replying to dmisev:

Please look at the standard.

In the OGC, documentation, it does not give detail about this factor
Edit: in OGC also have a detail

Note A value of 1.0 leaves the coverage unscaled, a value between 0 and 1 scales down
 (reduces target domain), a value greater than 1 scales up (enlarges target domain).

so the current behavior in WCS is opposite.