About Raster Layers

Raster data is made up of pixels, each of which has its own value. TerraExplorer supports two types of raster data: geo-referenced, satellite or aerial images that overlay the terrain imagery and geo-referenced elevation raster that replaces the elevation data of the terrain database.

All raster layers are displayed in the coordinate system of the terrain database. If a layer is in a different coordinate system, TerraExplorer can automatically reproject the layer on the fly to the terrain’s coordinate system. If a source does not include coordinate system information, you should supply the coordinate system information so that TerraExplorer can reproject the layer.

A file can be of better resolution than the area on which it is placed. Automatic morphing between the terrain imagery and the imagery layer is performed on computers with Microsoft DirectX version 9.0 installed.