We are generating landscape images for areas of big extent. Later, in OpenSceneGraph, these images will be used as textures of the 3D model of the terrain. One way of creating this textures is generating the landscape with VUE, VNS, Terragen, mainly creating ecosystems for the different kinds of vegetation; and then rendering an ortho image from the top, and exporting the image in .tif or other formats. So, the problem is: if we just render the ortho image covering the whole area, there is no high level of detail or resolution. One solution is tilling. This is deviding the area in several smaller areas or tiles, and render them one by one, achieving higher detail. 

Actually, there is no need to add 3D models such trees and plants, we only need a texture image of the soil, because the 3D models will be added later on OpenSceneGraph. The goals are: 

• Generating the image of the soil thanks to the ecosystem generation by means of masks.

• Exporting this image splitted in several tiles. This is because if we render the ortho image of the whole area, the resolution will be too low. Therefore, we have to idealy divide the area in several parts and render them from a closer point of view, achivieing higher resolution. Then, those tiles will compose the total image.

• The tiles must be georefereded, because when introduced into OSG, they have to mantain the right location over the terrain. This could be done by means of absolute georeferencing (cartographic reference frame), or maybe by relative georeferencing (relative locationbetween tiles).

• All the previous steps must be done as most automatic as possible.