#1827: Measure Distance - Bearing
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Reporter: voncasec | Owner: grass-dev@…
Type: defect | Status: closed
Priority: normal | Milestone: 6.4.3
Component: wxGUI | Version: svn-releasebranch64
Resolution: fixed | Keywords: Bearing tool, MapFrame.MeasureDist()
Platform: Linux | Cpu: x86-64
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Changes (by hamish):
* keywords: Bearing tool => Bearing tool, MapFrame.MeasureDist()
* resolution: => fixed
* status: new => closed
* component: Display => wxGUI
Comment:
yes, the N-S was calculated backwards in the wxGUI. fixed in all branches
with r55801-4.
It also now states the convention used, since this one is backwards as to
how grass typically measures it. (here using navigational convention
instead of mathematical one) If you want the standard GRASS way (reporting
theta CCW from the +x axis) uncomment the line in frame.py as documented
in the code.
I am glad to see MapWindow.Distance using G_distance() via ctypes for
geodesic distance in lat/lon. I wonder for LL if we should have frame.py
check for meters as the unit, and report km instead if the distance is >
2500.0?
(btw, note if you want bearing in lat/lon locations there will be two
different bearings, a forward and backward one from each endpoint. (see
the man page for `geod`))
Hamish
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Ticket URL: <https://trac.osgeo.org/grass/ticket/1827#comment:2>
GRASS GIS <http://grass.osgeo.org>
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