River terrain index TOPMODEL hydrological model has
been applied to Land surface model (Land
surface Models, LSMs), to improve Land surface of hydrological process
simulation model. The core of TOPMODEL is terrain index (ln(α/tanβ)).
And it is an important index on the hydrologic analysis. Therefore, effective
extracting terrain index information is very important. In this paper, the
huaihe river basin as a case area, the terrain index extraction process model is
build, using the ArcGIS9 Model Builder tools. This model is based on a single
flow algorithm for calculating process. Model has higher versatility, because
of fully considering the effectiveness of the parameters such as the slope and
the flow accumulation in the model design process. Using this model can be very
simple and quick to get terrain exponential distribution data of terrain index.
S. K. Jenson, J. O. Domingue. Extracting topographic structure from digital elevation data for geographic information system analysis. Photogrammetric Engineering and Remote Sensing, 1988, 54(11), 1593-1600.