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Anisotropic Scaling of Remotely Sensed Drainage Basins: the Differential Anisotropy Scaling Technique : Volume 14, Issue 4 (06/07/2007)

By Beaulieu, A.

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Book Id: WPLBN0004019833
Format Type: PDF Article :
File Size: Pages 14
Reproduction Date: 2015

Title: Anisotropic Scaling of Remotely Sensed Drainage Basins: the Differential Anisotropy Scaling Technique : Volume 14, Issue 4 (06/07/2007)  
Author: Beaulieu, A.
Volume: Vol. 14, Issue 4
Language: English
Subject: Science, Nonlinear, Processes
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Gaonac'h, H., Lovejoy, S., & Beaulieu, A. (2007). Anisotropic Scaling of Remotely Sensed Drainage Basins: the Differential Anisotropy Scaling Technique : Volume 14, Issue 4 (06/07/2007). Retrieved from

Description: Université du Québec à Montréal – Centre GEOTOP-UQÀM-McGill, C.P.8888 succursale Centre-Ville, Montréal, Québec, H3C 3P8, Canada. We investigate the statistical properties of dendritic drainage areas from diverse geological environments (Deception Canyon, Utah and the Loess Plateau, China) using narrow band visible ASTER satellite images. We show that from 240 m to 7680 m, the isotropic (angle integrated) energy spectra E(k) of all the fields closely follow a power law form: E(k)∝k−Β where k is a wave number and β a scale invariant exponent. In spite of this good isotropic scaling, images with very similar β's and similar isotropic multifractal exponents have distinct textures; we suggest that the differences are primarily due to anisotropy, which is nevertheless scaling. We develop the new Differential Anisotropy Scaling technique to characterize this scale-by-scale (differential) anisotropy and we test it on simulated anisotropic scaling fields. The method gives useful characterizations of the scale by scale anisotropy irrespective of whether or not the analyzed field is scaling. When the anisotropy is not too strong, the parameters can be interpreted as scale invariant anisotropy exponents. Viewed as a method of estimating these exponents, it has the advantage of relying on two linear regressions rather than on complex higher dimensional nonlinear ones. When applied to dendritic drainage basins we find that they have distinct anisotropies characterized by differential anisotropy stretching and rotation parameters as well as by a distinct absolute anisotropy at the reference scale of 960 m. Our new method allows us to statistically distinguish, not only between two geologically different drainage basins (the China Loess Plateau and Utah Deception Canyon), but also between different regions of the same China drainage system.

Anisotropic scaling of remotely sensed drainage basins: the differential anisotropy scaling technique

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