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Testing for High Frequency Noise in DEMs Using FFTs
January 2017

CODE MIGRATION TO PYTHON :)

Note: This analysis has been migrated to Python as of May 2020: https://github.com/bpurinton/DEM-FFT

Proceed below if you want to work with MATLABTM.

Matlab code for DEM noise analysis using 2D DFT

This MATLABTM function is intended for the spectral analysis of gridded topographic data (DEMs) for analysis of high-frequency, low-wavelength noise as presented in:

Purinton, B., and Bookhagen, B.: Validation of digital elevation models (DEMs) and geomorphic metrics on the southern Central Andean Plateau, Earth Surface Dynamics, 2017. (https://doi.org/10.5194/esurf-5-211-2017)

Running it

Prior to analysis the user must download and set path to a few required functions:

  1. The 2DSpecTools package from T. Perron available here

    • For background on this spectral analysis procedure and the paper that spurred this analysis refer to: Perron, J. T., Kirchner, J. W., and Dietrich, W. E.: Spectral signatures of characteristic spatial scales and nonfractal structure in landscapes, Journal of Geophysical Research, 113, 2008. https://doi.org/10.1029/2007JF000866

  2. The TopoToolbox package from W. Schwanghart available here

    • Schwanghart, W., and Scherler, D.: Short Communication: TopoToolbox 2 – MATLAB-based software for topographic analysis and modeling in Earth surface sciences, Earth Surface Dynamics, 2, 1-7, 2014. https://doi.org/10.5194/esurf-2-1-2014