FCT did have access to a layer of 20m contour lines, vectorized from paper topographic maps (1:25,000, 1994)
by Omar Delgado Inga of the Universidad del Azuay, as part of a larger project aimed at digitizing geographic
information of the greater Paute River Watershed. ArcGIS 9.3’s 3-D Analyst was used to convert this contour
vector layer to a Triangulated Irregular Network (TIN) (Figure 10-A) and subsequent 5m DEM (Figure 10-B). The
resulting DEM – when displayed with a hillshade effect – would serve as an excellent visual reference during
Ground Control Point (GCP) extraction prior to aerial triangulation.