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Upon opening a .gpx file I got the message :
$ gpxviewer
Traceback (most recent call last):
File "/usr/share/gpxviewer/gpxviewer/ui.py", line 300, in onTrackAdded
self.selectTrace(trace)
File "/usr/share/gpxviewer/gpxviewer/ui.py", line 347, in selectTrace
distance = trace.get_distance()
File "/usr/share/gpxviewer/gpxviewer/gpx.py", line 153, in get_distance
return self._get_cached_value("distance")
File "/usr/share/gpxviewer/gpxviewer/gpx.py", line 99, in _get_cached_value
self._walk_points()
File "/usr/share/gpxviewer/gpxviewer/gpx.py", line 75, in _walk_points
d = calculate_distance(point['lat'], pointp['lat'], point['lon'],
pointp['lon'])
File "/usr/share/gpxviewer/gpxviewer/gpx.py", line 36, in calculate_distance
arc = acos((sin(lat1) * sin(lat2)) + (cos(lat1) * cos(lat2) * cos(lon2 -
lon1)))
ValueError: math domain error
I inserted the line :
print "lat1=",lat1, "lat2=",lat2, "lon1=",lon1, "lon2=",lon2
And got :
.....
lat1= -22.951462 lat2= -22.951447 lon1= -43.356941 lon2= -43.356937
lat1= -22.951469 lat2= -22.951462 lon1= -43.356941 lon2= -43.356941
lat1= -22.951469 lat2= -22.951469 lon1= -43.356941 lon2= -43.356941
Traceback (most recent call last):
File "/usr/share/gpxviewer/gpxviewer/ui.py", line 300, in onTrackAdded
self.selectTrace(trace)
File "/usr/share/gpxviewer/gpxviewer/ui.py", line 347, in selectTrace
distance = trace.get_distance()
File "/usr/share/gpxviewer/gpxviewer/gpx.py", line 156, in get_distance
return self._get_cached_value("distance")
File "/usr/share/gpxviewer/gpxviewer/gpx.py", line 102, in _get_cached_value
self._walk_points()
File "/usr/share/gpxviewer/gpxviewer/gpx.py", line 78, in _walk_points
d = calculate_distance(point['lat'], pointp['lat'], point['lon'],
pointp['lon'])
File "/usr/share/gpxviewer/gpxviewer/gpx.py", line 39, in calculate_distance
arc = acos((sin(lat1) * sin(lat2)) + (cos(lat1) * cos(lat2) * cos(lon2 -
lon1)))
ValueError: math domain error
Interactively computing the value I got :
>>> ((sin(lat1) * sin(lat2)) + (cos(lat1) * cos(lat2) * cos(lon2 - lon1)))
1.0000000000000002
This seems to be a typical perversion of floating point rounding error.
Do not seems too complicated to fix.
Something like the patch I am attaching.
** Affects: ubuntu
Importance: Undecided
Status: New
** Tags: valueerror
--
rounding error interrupts GPXViewer
https://bugs.launchpad.net/bugs/832059
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