Developer’s Corner: Accurate datum shift and full transformation control in GeoServer
Hi all,in this blog we're going to introduce the new GeoServer/GeoTools support for high accuracy datum transformation and projection control in general.Starting with release 2.2-beta2 GeoServer has support for grid based transformations, in particular NTv2 and NADCON grids. The grid allow for centimeter accurate transformations between datums, which is much better than the usual 7 parameters transformation supported so far by GeoServer, which included a few meters error.The reason for this difference is simple, the 7 parameters transformation is a simple roto-translation in 3D space, plus scaling, whilst the grid is a point to point mapping between position in the...
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