[osg-users] Accessing georegistered images via GDAL plug-in - too many limitations...

[Robert Osfield]

Hi Christian,

The GDAL plugin was written to read basic image and height field data via
GDAL rather than expose all the possible data.  Potentially this could be
added, but I you are the first I recall asking for it.

Robert.

On 8 September 2015 at 15:12, Christian Buchner <christian.buchner at gmail.com
> wrote:

> Hi,
>
> while height fields loaded via the GDAL plug-in get their coordinate
> origin and x/y extents as well as rotation set correctly via the following
> code in ReaderWriterGDAL.cpp
>
> hf->setOrigin(osg::Vec3(BottomLeft[0],BottomLeft[1],0));
> hf->setXInterval(sqrt(geoTransform[1]*geoTransform[1] +
> geoTransform[2]*geoTransform[2]));
> hf->setYInterval(sqrt(geoTransform[4]*geoTransform[4] +
> geoTransform[5]*geoTransform[5]));
> hf->setRotation(osg::Quat(rotation, osg::Vec3d(0.0, 0.0, 1.0)));
>
> there appears to be no comparable facility to the GDAL plugin's image
> loader. All that will be returned is an osg::Image without any geo
> referencing data - if I understand the code correctly.
>
> I would propose that we set named properties like Origin, XInterval,
> YInterval, Rotation using the  osg::Object->setUserValue()
> <http://trac.openscenegraph.org/documentation/OpenSceneGraphReferenceDocs/a00530.html#a0ec078a3a1a1120ceb7c10fcf52da979>
> member function as osg::Vec2 objects.
>
> Also it would appear that the GDALDataset (which is a derived class of
> osgTerrain::Layer) is not accessible to the caller (user) of the GDAL
> plug-in. It would be nice if there was a facility to somehow access this
> dataset ptr through an API - as this object contains all the georeferencing
> information equired to slap this piece of data onto an OSGTerrain::Terrain
>
> Christian
>
>
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>
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