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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 2.92a. 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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Type	Description
File	Geodetic Toolbox

Files Matching Jonathan's Watch List					1 - 1 of 1
Updated		File	Tags	Downloads (last 30 days)	Comments	Rating
31 May 2009		Geodetic Toolbox Toolbox for angle, coordinate and date conversions and transformations. Version 2.92a. Author: Mike Craymer	angle, julian, statistics, gps week, optimization, geomatics	210	11	4.625 4.6 \| 8 ratings

Comments and Ratings Matching Jonathan's Watch List			1-5 of 12
Date	File	Comment by	Comments	Rating
16 Oct 2009	Geodetic Toolbox Toolbox for angle, coordinate and date conversions and transformations. Version 2.92a.	Jonathan	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>	Comment only
29 Jul 2009	Geodetic Toolbox Toolbox for angle, coordinate and date conversions and transformations. Version 2.92a.	Sepideh	Thanks for that, very useful	5
24 Feb 2009	Geodetic Toolbox Toolbox for angle, coordinate and date conversions and transformations. Version 2.92a.	Mike Craymer	I corrected the bug for vector and array input to function ell2utm per Sebastian Holz's comments and posted a new version 2.91. Unfortunately, the fix only worked for row vectors. I've corrected it again in version 2.92 and tested it this time to make sure it works. Sorry for any problems this may have caused. In addition to error checking, I'll consider adding array input to all functions in the next major release (this Summer I hope).	Comment only
18 Feb 2009	Geodetic Toolbox Toolbox for angle, coordinate and date conversions and transformations. Version 2.92a.	Sebastian Hölz	There is a potential bug in function ell2UTM, which may lead to wrong results in the calculated northing, if the funciton is called with a vector containing coordinates from both southern and northern hemisphere. Change lines 23-27, which read ... if lat>=0 No=0; else No=10000000; end to ... No(size(lat))=0; % False northing (north) No(lat<0) = 1e7; % False northing (south) Sebastian	Comment only
27 Jan 2009	Geodetic Toolbox Toolbox for angle, coordinate and date conversions and transformations. Version 2.92a.	Christopher	under matlab which file do i put this in so that it is being used?	4

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