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Rotor (rot)
is a curvature of flow lines*. The unit of measurement is m-1. Once
elevations are given by
where
Rotor is a
measure of twisting of flow lines. Flow lines turn clockwise when rot
> 0, while flow lines turn anti-clockwise when rot < 0. Like other local morphometric
variables, rotor can be derived from a digital elevation model (DEM) by finite-difference
methods (e.g., IF-2009
method and IF-1998
method) as well as the universal spectral
analytical method. Example**. A model of rotor was derived from a
DEM of Mount Ararat by the
universal spectral analytical method.
The model includes 779,401 points
(the matrix 1081 x 721); the grid spacing is 1". To deal
with the large dynamic range of this variable, its values were logarithmically transformed. The vertical
exaggeration of the 3D model is 2x. The data processing and modelling were carried out using the software Matlab R2008b. |
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DIGITAL TERRAIN ANALYSIS IN SOIL SCIENCE AND GEOLOGY 2nd revised edition I.V. Florinsky Elsevier / Academic Press, 2016 Amsterdam, 486 p. ISBN 978-0-12-804632-6 |
