Rank: 420 based on 163 downloads (last 30 days) and 10 files submitted
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Val Schmidt

E-mail
Company/University
University of New Hamsphire Center for Coastal and Ocean Mapping

Personal Profile:
Professional Interests:
signal processing, oceanography, ocean engineering, sonar, autonomous underwater vehicles, underwater navigation

 

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Files Posted by Val View all
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(last 30 days) 		Comments Rating
25 Apr 2012 gps_chksum A function to calculate the checksum for a NMEA/GPS string. Author: Val Schmidt gps, nmea 11 0
25 Apr 2012 dist2plane A function to calculate the distance from a point to a plane. Author: Val Schmidt mathematics, point, plane 6 3
24 Apr 2012 Screenshot circle_fit A function to fit a circle to a set of 2D points Author: Val Schmidt circle, fit, mathematics 13 2
24 Apr 2012 Screenshot raytrace A function to model acoustic refraction due to variations in sound speed. Author: Val Schmidt acoustics, ray tracing, refraction, ocean engineering, modeling, underwater acoustics 31 2
  • 5.0
5.0 | 2 ratings
24 Apr 2012 Screenshot planefit A function to fit a plane to a 3D point cloud. Author: Val Schmidt plane, fit 33 0
Comments and Ratings by Val View all
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Updated File Comments Rating
10 May 2012 Google Earth Toolbox Various plotting/drawing functions that can be saved as KML output, and loaded in Google Earth Author: scott lee davis

10 May 2012 Google Earth Toolbox Various plotting/drawing functions that can be saved as KML output, and loaded in Google Earth Author: scott lee davis

This is a great tool and it seems very thoughtfully written. I do have a request:

When I create kmz files I get a zipped kml file but any images to display are not included. I would like the kmz files to consist of a zipped bundle of the kml and all its component parts (images to display for example) so that the result is completely self-contained. To me, that's the real advantage of kmz over kml - a single portable file without others to look after.

Thanks,

Val
10 May 2012 Google Earth Toolbox Various plotting/drawing functions that can be saved as KML output, and loaded in Google Earth Author: scott lee davis

10 May 2012 Google Earth Toolbox Various plotting/drawing functions that can be saved as KML output, and loaded in Google Earth Author: scott lee davis

25 Apr 2012 dist2plane A function to calculate the distance from a point to a plane. Author: Val Schmidt

Hi Jan,
The plane is defined by the equation:
z = C(1)x + C(2)y + C(3)

Try
x=1:10;
y=1:10;
[xx yy ] = meshgrid(x,y)
C = [1 2 3];
zz = C(1)*xx+C(2)*yy+C(3)
surf(xx,yy,zz,'edgecolor','none')

-Val

PS. You are right about the transposing. Thanks.
Comments and Ratings on Val's Files View all
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26 Apr 2012 dist2plane A function to calculate the distance from a point to a plane. Author: Val Schmidt Simon, Jan

I'm used to define a plane as "ax+by+cz+d=0", by the normal and one point or by three points. Can your formula define the XY-, YZ- and XZ-planes?
See http://en.wikipedia.org/wiki/Plane_%28geometry%29
25 Apr 2012 dist2plane A function to calculate the distance from a point to a plane. Author: Val Schmidt Schmidt, Val

Hi Jan,
The plane is defined by the equation:
z = C(1)x + C(2)y + C(3)

Try
x=1:10;
y=1:10;
[xx yy ] = meshgrid(x,y)
C = [1 2 3];
zz = C(1)*xx+C(2)*yy+C(3)
surf(xx,yy,zz,'edgecolor','none')

-Val

PS. You are right about the transposing. Thanks.
25 Apr 2012 dist2plane A function to calculate the distance from a point to a plane. Author: Val Schmidt Simon, Jan

I do not get how to define the plane:
"C: 3x1 plane coeficient vector i.e., zplane = C(1)*x+C(2)+C(3)". Which value of C defines the e.g. Z-plane?
In "sqrt(sum((po-pp)'.^2))" the transposing is inefficient. Better: "sqrt(sum((po-pp).^2, 2))"
25 Apr 2012 circle_fit A function to fit a circle to a set of 2D points Author: Val Schmidt Schmidt, Val

Ah! Thanks. Very helpful.

25 Apr 2012 circle_fit A function to fit a circle to a set of 2D points Author: Val Schmidt Eric

This seems equivalent to http://www.mathworks.com/matlabcentral/fileexchange/5557-circle-fit. Also, other algorithms are often more accurate when fitting data along only an arc (e.g., http://www.mathworks.com/matlabcentral/fileexchange/22643 ).

A good reference for fitting data to circles: "Least Squares Fitting of Circles" by N. Chernov and C. Lesort, Journal of Mathematical Imaging and Vision, Vol 23, 239-252 (2005). Nikolai Chernov has several good functions in the FEX for fitting to circles and ellipses.

Top Tags Applied by Val
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mathematics, plane, acoustics, fit, binary
Files Tagged by Val View all
  • 1 - 5 of
  • 10
Updated   File Tags Downloads
(last 30 days) 		Comments Rating
25 Apr 2012 gps_chksum A function to calculate the checksum for a NMEA/GPS string. Author: Val Schmidt gps, nmea 11 0
25 Apr 2012 dist2plane A function to calculate the distance from a point to a plane. Author: Val Schmidt mathematics, point, plane 6 3
24 Apr 2012 Screenshot circle_fit A function to fit a circle to a set of 2D points Author: Val Schmidt circle, fit, mathematics 13 2
24 Apr 2012 Screenshot raytrace A function to model acoustic refraction due to variations in sound speed. Author: Val Schmidt acoustics, ray tracing, refraction, ocean engineering, modeling, underwater acoustics 31 2
  • 5.0
5.0 | 2 ratings
24 Apr 2012 Screenshot planefit A function to fit a plane to a 3D point cloud. Author: Val Schmidt plane, fit 33 0

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