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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

accurate

(Olivera

et

al.,

1999).

For

this

reason

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).

of

the

model

and

the

objectives

of

the

study

2.3.2

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

11

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