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Gaussian Convolution Filter

by Felix Hebeler

12 Jan 2007 (Updated 06 Feb 2007)

No BSD License

Filter to introduce spatial autocorrelation while keeping original distribution.

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File Information

Description

Simple script to apply a gaussian convolution filter to a matrix (e.g. of white noise) to introduce spatial correlation while (generally) preserving the original distribution .
Based on the approach of spatial moving averages according to Oksanen and Sarjakoski 2005: Error propagation analysis of DEM-based drainage basin delineation. International Journal of Remote Sensing 26 (14), 3085-3102
DOI:10.1080/01431160500057947

Note: Distribution is not preserved _exactly_. Approach is valid for equidistant matrices of values that are the result of a gaussian process. Please read the help/inline comments!

Plz give feedback or report bugs in the comments section!

MATLAB release

MATLAB 7.2 (R2006a)

Other requirements

Inline comments follow the steps in the original publication. No requirements, runs fine under Linux and Windows versions.

Tags for This File
Everyone's Tags	convolution filter, matrix filter, raster, spatial autocorrelation
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Comments and Ratings (2)
10 Oct 2007	Felix Hebeler	Mean and standard deviation of a distribution will only be kept if the mean is 0! If you need a different mean, add it after filtering... (Thanks Gary!)
17 Oct 2008	lmode70 med	merçi merçi merçi merçi merçi merçi merçi merçi merçi merçi merçi merçi merçi merçi merçi merçi

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Updates
15 Jan 2007	Fix Link using HTML to prevent broken layout and correct typos.
15 Jan 2007	Forgot to include a helper function...
23 Jan 2007	Include helper function, add example and notes
06 Feb 2007	Delete Link in Description, see if MLint works now...

Tag Activity for this File
Tag	Applied By	Date/Time
convolution filter	Felix Hebeler	22 Oct 2008 08:56:49
raster	Felix Hebeler	22 Oct 2008 08:56:49
matrix filter	Felix Hebeler	22 Oct 2008 08:56:49
spatial autocorrelation	Felix Hebeler	22 Oct 2008 08:56:49

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