advanced methods or to customize a DEM. Another factor affecting accuracy is whether the data are integer or floating points. When data are integers, less memory is required than when data are floating points; however floating point
data are more resolution must
be considered when selecting a DEM for hydrologic
quality and modeling so
that both are consistent being made (Garbrecht
with the scale et al., 1999a).
Triangulated Irregular Networks
Another form of digital data is the triangulated irregular network or TIN. TINs, however, are currently not as widely used as grid DEMs, but may be used to serve the same purpose. TINs consist of a set of representative irregularly distributed points connected by straight lines to produce triangles, as shown in Figure 2.3.
Figure 2.3: TIN Up-Close