[Manifold-l] distance problems converting to KML files

[Brian Webster]

Adam,
	This distance I was measuring was using the tracker tool but I had also
specified distance when drawing things like buffers or rings around a point.
These distances seem fine in Manifold and match up as expected, it's when I
export the file to a KML and then use the measurement tool in Google Earth
that I get big differences, around 15% or so.



Thank You,
Brian

-----Original Message-----
From: adamw at manifold.net [mailto:adamw at manifold.net]
Sent: Tuesday, June 26, 2007 9:40 AM
To: manifold-l at directionsmedia.net
Subject: RE: [Manifold-l] distance problems converting to KML files


> If I project a drawing to mercador in miles and select objects
> contained in a 35 mile radius and then export the results to a KML
> file the distance across the area selected measured in Google Earth is
> not the same as measured in Manifold.

How exactly have you been measuring the distance in Manifold? If you were
using the Tracker tool without the Ctrl button, Manifold was reporting a
Euclidean distance. If you were using the Tracker tool with the Ctrl button,
Manifold was reporting an ellipsoidal distance. The difference between
Euclidean and ellipsoidal distances can be pretty large.

I am not sure what type of distance is being reported in Google Earth, but
it might not coincide with whatever type you used in Manifold.

--
Adam Wachowski
Manifold Development Team


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