I want to import an elevation layer into GeoServer for later WMS access. This is the base layer I would like to import - http://en.wikipedia.org/wiki/File:Srtm_ramp2.world.21600x10800.jpg . What I'd like to do is reproject the layer to Mercator so it looks like this http://upload.wikimedia.org/wikipedia/commons/thumb/f/f4/Mercator_projection_SW.jpg/350px-Mercator_projection_SW.jpg , then somehow convert it to GeoTIFF so that I can import it into GeoServer.
How should I proceed?
I tried using gdal_warp to reproject my layer but it warps the layer completely leaving nothing behind. I had some success reprojecting the layer using G.Projector, but it doesn't work for bigger images and it doesn't georeference the image anyway (GeoServer reports no layers in GeoTIFF file).