Paths, LineString, MultiLineString Question

[Mike_Wood]

We've started a group that is documenting the history of street and interurban railways and we have been using Google Earth as a front end. A major historical archive for this information has asked, as have our members, who are not techies, how they can produce lines that accurately depict both tangents and curves of the particular lines.

I have done this using GIS tools but the learning curve for the various GIS apps are just too steep for many of our members who are working within GE and editing KML. Questions follow:

Paths: Over 4 pixels seems to default to 4 pixels.

MultiLineString: This undocumented feature is of interest. Are there any examples that I could use to play with?

Curves: Is there anyway/tools to depict curves, a collection of chords simulating a curve, by extrapolation, or best fit methods? That is, without specifying many separate coordinates.

[TJ1]

A MultiLineString is a container that can be placed inside a Placemark or MultiGeometry and contain (obviously) multiple unconnected LineStrings! It appears to be a specialised form of MultiGeometry that superceded GeometryCollection.

The only contouring that the Geometry does currently is in following the ground contour when tessellate is true.

I have an application the records and draws LineString paths that track where the user has been, and it would be nice to have curves rather than straight lines without needing to interpolate points.

[Mike_Wood]

Quote:

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The only contouring that the Geometry does currently is in following the ground contour when tessellate is true.

I have an application the records and draws LineString paths that track where the user has been, and it would be nice to have curves rather than straight lines without needing to interpolate points.

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Thanks, before I posted this I cruised around and read several of your posts. Since I wrote this, I have looked at XML and GML and all that hazy markup language stuff is slowly coming back.

What I'm looking at now is a back and forth with GPS and GPX using some map resources I have. The methods can't be too exotic or our members' heads explode.

Mike

[PriceCollins]

Is there a way to have the default for lines, paths, and polygons be tesselate is true?

It is a bother to have to adjust the KML for each instance.