Hi, I'm looking for a double check for an issue I have with the wcs 1.1.1 specification. The specification states that GetCoverage can be performed with a bbox that spans the antimeridian and defined like this:
"A Bounding Box defined in a geographic CRS (or a WGS84BoundingBox) whose LowerCorner longitude is greater than that of its UpperCorner shall describe a region that crosses the longitude discontinuity" Now, given the axis order issues, I'll first have to determine where longitude is. Looking at the code it seems the way is to scan the coordinate system axis and look for the one whose direction is EAST. Is that correct? Now, once I determined it, I'll just add 360 to the lower coordinate to have a bbox that can be accepted by the envelope constructors. Yet, this is not over. Consider a case where I have a grid coverage that spans -180,180 longitude and a wcs requests asking for the bbox 175,10,-175,20. I recognize the antimeridian crossing case and I turn it into 175,10,185,20. Yet, it's not over because I have to grab two different regions from the original coverage and merge them togheter. I've looked into the coverage processing package but I've found no mosaicking operation. Since I don't need a full fledged mosaic I guess I'll have to * crop the two regions from the original coverage * mosaic togheter the two rendered images * reconstruct the grid geometry so that it's seamless (which means, using the world to grid transform of the cropped image that will end on the lower longitude side and expanding the grid envelope) * rebuild the final coverage keeping the same categories How does this sound? Any suggestion? I guess this approach is going to become quite a bit more complex with ND coverages, or not? Cheers Andrea ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Geotools-devel mailing list Geotools-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/geotools-devel
