Geoscience Reference
In-Depth Information
(a)
97
100
102
84
90
95
78
86
86
(b)
97
100
102
84
90
95
78
86
86
(c)
97
100
102
84
90
95
78
86
86
Figure 3.4
Analysis of flow lines from raster digital elevation data: (a) single steepest descent flow direction;
(b) multiple direction algorithm of Quinn et al. (1995); (c) resultant vector method of Tarboton (1997).
streamlines automatically is a complex problem, but at least one package, TAPES-C, associated with the
Australian THALES and TOPOG models, is available (e.g. O'Loughlin, 1986; Grayson
et al.
, 1995).
TIN DEMs are widely used in GIS systems, visualising a three-dimensional topography on screen,
and have been used as the basis for a number of distributed hydrological models, since within each
slope facet represented within the TIN, the aspect, slope angle and downslope flow direction are easily
