Resampling
The geospatial procedure of resampling transforms geospatial raster data into the proper format for viewing (visualization). The geospatial data comes in two flavors: imagery (or orthophotos) and elevation (aka. height field). The data is usually provided as a RGB images specifying the color and height fields specifying the terrain’s elevation at evenly spaced raster positions. Both flavors combined, define the mesh geometry of the curved earth’s surface with the imagery draped over it.
A resampling tool like libGrid takes a list of geospatially referenced images or height fields and produces a tileset of the corresponding area. One piece of input data is said to be a so called layer. Since the layers most often have different orientation, size and different coordinate reference systems (CRS), the layers need to be resampled to a common coordinate reference system.
After that, the produced tileset can be displayed with the libMini library, for example.