Opened 14 years ago

Last modified 7 years ago

#4851 new defect

Display of angle is wrong with projection method WGS84

Reported by: dressman Owned by: team
Priority: minor Milestone:
Component: Core Version: tested
Keywords: projection wgs84 Cc:

Description (last modified by Don-vip)

With the projection method set to "WGS84 Geografisch" the angle display in the status line does not show the correct angle from / between lines. This may cause huge errors when mapping e.g. with a compass.

This effect can be tested by drawing a line of some length (200m or similar) in western / 90 degree direction, connected to a second one of the same length in south / 180 degrees direction. On completion of this isosceles triangle, you would expect the third line to be in the 315 degree direction (45 degrees inside the triangle). It shows 302 degrees instead; the value this depends on the chosen length - a 300m triangle shows 292 degrees for the last line etc.

Tested with JOSM 3094 and 3166 under Mac OSX 10.5.8/PPC/Java 1.5.0_22-147 and Linux 2.6.24-27/Intel/Java 1.6.0_0-b11.

Workaround: use another projection method like UTM or Mercator.

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Change History (3)

comment:1 by dressman, 14 years ago

Update: effect strength depends also on the zoom level.

comment:2 by Don-vip, 7 years ago

Description: modified (diff)
Keywords: projection added; anlge display removed

comment:3 by Don-vip, 7 years ago

Keywords: wgs84 added

similar to #5190

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