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From Chris Lindsley at ORNL:

I am working on inputing metadata for the EVS-1 CARVE project from the ORNL DAAC into CMR.  For CARVE we have the flight path for each granule.  I was hoping to input that flight path into the CMR as a polyline.  I don't see polyline as an option in the UMM documentation.  Do you know if there is a way I can do that?

I was looking at some metadata from icebridge and it looks like they input a very thin polygon which at lower zoom levels looks like a polyline.  Unfortunately this kind of solution requires double the points.

Do you happen to know what I should use as an upper limit of points in either a polyline or polygon?  Our raw data has 30,000 or so points for each flight.  That's obviously too much, I'd like to know what kind of subsetting I'll need to do.