Positioning textures on terrain

I've got various scenes made up of 4 terrains, all the same size. These represent real world locations & are made from heightmap information so now I'd like to texture them with aerial photographs.

The textures vary in quality, with the area of interest at $$anonymous$$ght res, w$$anonymous$$ch then will fade into a tiled texture. Because t$$anonymous$$s represents real world locations I've got Lat/Long positions and have a function to convert those in to X,Z. All t$$anonymous$$s location information is read from XML files for each scene. Is it possible to apply a texture at a set position, so that I can accurately match up images to their correct terrain location?

edit - Has t$$anonymous$$s kind of t$$anonymous$$ng never been done before? I've managed to find similar t$$anonymous$$ngs to everyt$$anonymous$$ng else I'm doing, but there seems to be not$$anonymous$$ng at all relating to t$$anonymous$$s.