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Jonathan

E-mail: jonathanmaccarthy@hotmail.com

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Comments and Ratings by Jonathan		1 - 1 of 1
Updated	File	Comments	Rating
16 Oct 2009	Geodetic Toolbox Toolbox for angle, coordinate and date conversions and transformations. Version 2.95. Author: Mike Craymer	Hello, Thank you for such a useful toolbox! I have a question, however, regarding transforming lat,lon on the WGS84 ellipsoid to local North East Up. If I use the same lat,lon coordinate as both my point to convert and my origin, why would I get a -21.5 km local North value? Shouldn't North and East both be zero? Thanks again, Jon <SNIP> >> [a,b,e2,finv] = refell('WGS84'); %get ellipsoid params rlat = deg2rad(40); rlon = deg2rad(-108); %lat,lon [Xec Yec Zec] = ell2xyz(rlat,rlon,0,a,e2) %convert to ECEF xyz [N E Up] = ct2lg(Xec,Yec,Zec,rlat,rlon) %convert to local NEU Xec = -1.5119e+06 Yec = -4.6532e+06 Zec = 4.0780e+06 N = -2.1054e+04 E = 0 Up = 6.3693e+06 </SNIP>

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Files Matching Jonathan's Watch List					1 - 1 of 1
Updated		File	Tags	Downloads (last 30 days)	Comments	Rating
31 Mar 2011		Geodetic Toolbox Toolbox for angle, coordinate and date conversions and transformations. Version 2.95. Author: Mike Craymer	gps, angle, coordinate, aerospace, julian, gps week	167	24	4.7 4.7 \| 10 ratings

Comments and Ratings Matching Jonathan's Watch List			1-5 of 25
Date	File	Comment by	Comments	Rating
25 Sep 2011	Geodetic Toolbox Toolbox for angle, coordinate and date conversions and transformations. Version 2.95.	Mike Craymer	Re: 23 Jul 2011 post by muhammad faiz pa'suya Dear Muhammad: The ell2utm function will automatically determine and output the standard UTM zone in which your input coordinates fall. To also have it output the central meridian for the zone(s), change the first line of the ell2utm.m function from function [N,E,Zone]=ell2utm(lat,lon,a,e2,lcm) to function [N,E,Zone,lcm]=ell2utm(lat,lon,a,e2,lcm) This will be implemented in the next version of the Toolbox. To understand how the zones are determined, see the Wikipedia entry for UTM.	Comment only
22 Sep 2011	Geodetic Toolbox Toolbox for angle, coordinate and date conversions and transformations. Version 2.95.	Shien Kwun Leong	Very useful! Thank you very much.	5
23 Jul 2011	Geodetic Toolbox Toolbox for angle, coordinate and date conversions and transformations. Version 2.95.	joo tan	mike.. if i wnat to set the central meridian, like zon 50, where can i get the central meridian value??	Comment only
19 Apr 2011	Geodetic Toolbox Toolbox for angle, coordinate and date conversions and transformations. Version 2.95.	Vihang bhatt	It is really a good toolbox. Thank you for making my life little easy. One suggestion for the author on Julian dates. In the function jd2cal, jd has to be positive. jd can be negitive (if they exist), following modification needed to the code if(a==0) dy = c - e - fix(30.6001f) + rem((jd+0.5),max(a,1)); else dy = c - e - fix(30.6001f) + rem((jd+0.5),a); end In above case you are able to get 1st gragorian date for zeroth julian day. otherwise greogrian calander start from 2nd jan. Dr. Vihang Bhatt	5
13 Mar 2011	Geodetic Toolbox Toolbox for angle, coordinate and date conversions and transformations. Version 2.95.	Mike Craymer	Sorry again! I keep forgetting that the MATLAB File Exchange doesn't like the use of the standard angle brackets enclosing URLs. Here is the clickable URL sans brackets: http://www.craymer.com/software/matlab/geodetic/	Comment only

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