[postgis-devel] WKTRaster Scale and Skew
Pierre.Racine at sbf.ulaval.ca
Wed Sep 22 07:33:33 PDT 2010
Hi Frank :-)
>I haven't read over the proposals for ST_Rotation etc in WKTRaster in
>detail, but I hope you will be careful not to muddle things badly.
Hopefully not! We are just trying to make clear that pixelsizex is not really the pixel size in a rotated raster. This have been confusing many people.
>The phrase "so a user can always test if ST_RotationX = ST_RotationY
>and determine himself if it is a true rotation" was pretty damning in
This pinpoint the fact that there is actually two things rotated: a x component and a y component and that they can be different when the pixel is diamond shaped.
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