Resumen:
The DEM is generated from stereo aerial photos by aero-triangulation.
The processing was done by and is described in:
Jordan, E.; Ungerechts, L.; Cáceres, B.; Penafiel, A. and Francou, B. (2005): Estimation by photogrammetry of the glacier recession on the Cotopaxi Volcano (Ecuador) between 1956 and 1997. In: Hydrological Sciences 50, 949-961.
Information about further processing are rare.
Information about the quality are also rare. Triangulation artefacts in shadowed areas of the picture are known.
