Rank: 95 based on 382 downloads (last 30 days) and 14 files submitted
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Wolfgang Schwanghart

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Company/University
University of Postdam

Personal Profile:
Professional Interests:
GIS, Physical Geography, Hydrology

 

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Files Posted by Wolfgang View all
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(last 30 days)
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09 Jan 2013 Screenshot Experimental (Semi-) Variogram calculate the isotropic and anisotropic experimental (semi-) variogram Author: Wolfgang Schwanghart kriging, geostatistics, variogram, dimensions, spatial modelling, earth science 98 26
  • 4.90909
4.9 | 13 ratings
14 Oct 2010 Screenshot Ordinary Kriging 2D-interpolation using geostatistics Author: Wolfgang Schwanghart kriging, geostatistics, variogram 105 10
  • 3.875
3.9 | 8 ratings
14 Oct 2010 Screenshot variogramfit fits different theoretical variograms to an experimental variogram Author: Wolfgang Schwanghart ipdm, kriging, geostatistics, spatial statistics, variogram, optimization 76 14
  • 5.0
5.0 | 7 ratings
13 Jul 2010 Screenshot Line Simplification Recursive Douglas-Peucker Polyline Simplification (Iterative Endpoint Fit) Author: Wolfgang Schwanghart approximations, interpolation, polyline, vertex reduction, mathematics, approximation 41 10
  • 5.0
5.0 | 3 ratings
21 Sep 2009 Screenshot cropmat crop arrays with axis-aligned minimum bounding box Author: Wolfgang Schwanghart image processing, matrix, matrix manipulation 6 0
  • 2.0
2.0 | 1 rating
Comments and Ratings by Wolfgang View all
Updated File Comments Rating
25 Jul 2013 Experimental (Semi-) Variogram calculate the isotropic and anisotropic experimental (semi-) variogram Author: Wolfgang Schwanghart

@Riccardo: variogram supports higher dimensional data. In your case, just call the function like
variogram([x(:) y(:) z(:)], values, ...)

03 Apr 2013 Ordinary Kriging 2D-interpolation using geostatistics Author: Wolfgang Schwanghart

@Sébastien: Thanks for pointing at the error when using a nugget variogram.

I am currently abroad, so I probably won't find much time to update the function. So, in the meantime please adopt the changes proposed by Sébastien.

The problem with the gaussian variogram is most likely due to negative weights (see http://dx.doi.org/10.1016/0098-3004(96)00005-2 ). I will try to implement the procedure suggested by Deutsch (1996) in a future update.

15 Feb 2013 Ordinary Kriging 2D-interpolation using geostatistics Author: Wolfgang Schwanghart

@Imran Zafar: Fig. 4 shows the kriging variance which quantifies the uncertainty of the kriging estimates. You will note, that the kriging variance increases with increasing distance from observations.

24 Jan 2013 Custom GINPUT GINPUT with customizable cursor. Author: Jiro Doke

Jiro, thanks for the quick reply and fix!

23 Jan 2013 Custom GINPUT GINPUT with customizable cursor. Author: Jiro Doke

Great tool! Yet, there seems to be a bug which I cannot resolve. I called ginputc with

[x,y,button] = ginputc(1,'color','r','LineStyle','--')

in a function mytool. Despite the LineStyle should be valid, I receive following error message.

Error using mytool>ginputc (line 135)
Argument 'LineStyle' failed validation @(x)validatestring(x,{'-','--','-.',':'}).
Error in mytool (line 29)
[x,y,button] = ginputc(1,'color','r','LineStyle','--');

Any ideas?

Comments and Ratings on Wolfgang's Files View all
Updated File Comment by Comments Rating
01 Aug 2013 variogramfit fits different theoretical variograms to an experimental variogram Author: Wolfgang Schwanghart Aditi

25 Jul 2013 Experimental (Semi-) Variogram calculate the isotropic and anisotropic experimental (semi-) variogram Author: Wolfgang Schwanghart Schwanghart, Wolfgang

@Riccardo: variogram supports higher dimensional data. In your case, just call the function like
variogram([x(:) y(:) z(:)], values, ...)

25 Jul 2013 Experimental (Semi-) Variogram calculate the isotropic and anisotropic experimental (semi-) variogram Author: Wolfgang Schwanghart Ricardo

Hello Wolfgang,
I am trying to apply Kriging to a 3d mesh but first of all i don't know if i can use your variogram from a 3d data, it seems that only accepts X ans Y, not Z coordinates. Is there any way to use it with 3d input?
Thank you very much
Ricardo

16 May 2013 neighbor indexing returns neighbors of cells in n*m matrices Author: Wolfgang Schwanghart Gonzalez, Fernando

Very useful!

24 Apr 2013 variogramfit fits different theoretical variograms to an experimental variogram Author: Wolfgang Schwanghart meo

Top Tags Applied by Wolfgang
geomorphology, geostatistics, hydrology, image processing, matrix manipulation
Files Tagged by Wolfgang View all
Updated   File Tags Downloads
(last 30 days)
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27 Jun 2013 Screenshot Easy 'n fast smoothing for 1-D to N-D data SMOOTHN allows automatized and robust smoothing in arbitrary dimension w/wo missing values Author: Damien Garcia image processing, signal processing, statistics, smooth 156 16
  • 4.75
4.8 | 16 ratings
09 Jan 2013 Screenshot Experimental (Semi-) Variogram calculate the isotropic and anisotropic experimental (semi-) variogram Author: Wolfgang Schwanghart kriging, geostatistics, variogram, dimensions, spatial modelling, earth science 98 26
  • 4.90909
4.9 | 13 ratings
14 Oct 2010 Screenshot Ordinary Kriging 2D-interpolation using geostatistics Author: Wolfgang Schwanghart kriging, geostatistics, variogram 105 10
  • 3.875
3.9 | 8 ratings
14 Oct 2010 Screenshot variogramfit fits different theoretical variograms to an experimental variogram Author: Wolfgang Schwanghart ipdm, kriging, geostatistics, spatial statistics, variogram, optimization 76 14
  • 5.0
5.0 | 7 ratings
13 Jul 2010 Screenshot Line Simplification Recursive Douglas-Peucker Polyline Simplification (Iterative Endpoint Fit) Author: Wolfgang Schwanghart approximations, interpolation, polyline, vertex reduction, mathematics, approximation 41 10
  • 5.0
5.0 | 3 ratings

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