[OpenLayers-Trac] [OpenLayers] #1241: basic measurement control
OpenLayers
trac at openlayers.org
Thu Feb 14 17:40:06 EST 2008
#1241: basic measurement control
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Reporter: tschaub | Owner: tschaub
Type: feature | Status: assigned
Priority: minor | Milestone: 2.7 Release
Component: Control | Version: 2.5
Resolution: | Keywords:
State: |
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Comment (by tschaub):
I'll add that this is still a sticky issue. Reprojecting points and
assuming Vincenty distances is not always what people expect. Open a map
in WGS84, draw a segment from Alaska to Kamchatka. That segment crosses
Europe on your map, but the distance calculated is based on a segment that
does not. Add points to your segment (keeping the line straight on the
map) and the Vincenty distance gets longer (though the line on your map
does not look longer). Draw a rectangle (four points) encompassing as
much of the map as you can. The Vincenty area does not include all of the
area that is covered by your box. Anyway, I just mean to say that there
is not one "real" measurement.
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Ticket URL: <http://trac.openlayers.org/ticket/1241#comment:5>
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