= '''PostGIS WKT Raster Beta 0.2.4 Working Specifications''' =
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'''Quick Links'''

 * [wiki:WKTRaster WKT Raster Home Page]
 * [wiki:WKTRaster/PlanningAndFunding Planning & Funding]

 * [wiki:WKTRaster/SpecificationWorking01 Beta 0.1.6 Working Specifications]
 * [wiki:WKTRaster/Documentation01 Beta 0.1.6 Documentation]

 * [wiki:WKTRaster/SpecificationWorking03 Working Specifications for Future Versions]

}}}
 
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== '''Objective B02x - Being able to intersect vector and raster to produce raster.''' ==
 

'''ST_Intersects(raster, raster)'''[[BR]]
'''ST_AsRaster(geometry, pixelsize) -> raster'''[[BR]]
'''ST_Intersection(geometry, raster, band) -> raster'''

 Variant 1: ST_Intersection(geometry, val, raster, band) -> raster with the same metadatada as the provided raster. Non intersecting pixels are filled with nodata values.

 Variant 2: ST_Intersection(geometry, val, raster, band, 'TRIM') -> raster with the same metadatada as the provided raster but the extent is reduced to the geometry extent. Non intersecting pixels are filled with nodata values.

 Rasterize the geometry as a new raster (ST_AsRaster(geometry, pixeltype, val, nodataval, raster)) and then copy only pixels for which both raster bands have a value. Optionally trim the raster to withvalue extent.

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== '''Objective B02x - Being able to use "group by" to accumulate tiles to form a new raster.''' ==
 

'''ST_Union(raster|geometry, raster|geometry, ‘raster’|’geometry’) -> raster/geometry'''[[BR]]
'''ST_Accum(raster set|geometry set, ‘raster’|’geometry’) -> raster/geometry'''

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== '''Objective B02x - Being able to set and get the skew of a raster in terms of rotation.''' ==

'''ST_SetRotation(raster, angle)'''

 Set the rotation of the raster. This method actually derive values for pixelsizex, pixelsizey, skewx and skewy based on the provided rotation angle.

 '''Open Question:'''
  PR: The angle should be provided in radian or in degree?

'''ST_Rotation(raster) -> float64'''
 Return the georeference's rotation angle in (degree or radiant?) derived from the pixel size and the skew.

  PR: I think getting the rotation get no sence since the result of pixelsizes and skew is not necessarily a rotation. It make sence to set it though.