GPX file reader

%LOADGPX Loads route points from a GPS interchange file

Description

% ROUTE = LOADGPX(FILENAME) Loads route point information from a .GPX
% GPS interchange file. This utility is not a general-purpose
% implementation of GPX reading and is intended mostly for reading the
% files output by the "gmap pedometer" tool.
%
% ROUTE is a Nx6 array where each row is a route point.
% Columns 1-3 are the X, Y, and Z coordinates.
% Columns 4-5 are latitude and longitude
% Column 6 is cumulative route length.
%
% Note that the mapping of latitude/longitude assumes an approximate spherical
% transformation to rectangular coordinates.
%
% Additional property/value arguments:
% LOADGPX(...,'ElevationUnits','meters',...) uses meters for elevation
% LOADGPX(...,'Viz',true,...) displays the route and elevation map
%
% For more information on the gmap pedometer and GPX output:
% http://www.gmap-pedometer.com/
% http://www.elsewhere.org/journal/gmaptogpx/
%
% See also xmlread

• MATLAB release: MATLAB 7.7 (R2008b)

[Andrew Bliss]

 

[Andrew Bliss]

This is a useful, good file. A few adjustments could improve it.

To allow the output, 1st line should be:
function route=loadgpx(fileName,varargin)

Calculate range before the viz section, so it can be output too if the viz option is off.

Something about the units is off but I didn't take the time to figure out what is wrong with it... gmaptogpx is outputting elevations in meters, right?

Thanks!

[David Longin]

 

[Georg Ogris]

 

[Georg Ogris]

To read my Garmin data change

ptList = d.getElementsByTagName('rtept');
into
ptList = d.getElementsByTagName('trkpt');

and add:

tim = pt.getElementsByTagName('time') ;
    timChar = char(tim.item(0).getTextContent) ;
    route(i,COL_TIMEVEC) = datevec([timChar(1:10) ' ' timChar(12:19)]) ;
    

before the end of the main for-loop
with

COL_TIMEVEC = 7:12;

[Evan]

Can't figure out the units of the X, Y, and Z columns. I did the same as George to get gpx files with trkpt instead of rtept. Also converted time to Matlab serial time using datenum.