-Sq Line Annotation between two coordinates

Kristof Koch <[email protected]> Mon, 28 Apr 2014 03:22:58 +0200

Newsgroups	gmane.comp.gis.gmt.user
Message-ID	<[email protected]>

Dear List,

I'm plotting some airways which are basically great circle segments between arbitrary coordinates. Every airway has a name as well (similar to a highway number) which I want to plot along the airway. 

The data comes as a list of coordinates per airway:

-43.16 60.057 
-40.00 61.00 
-30.00 63.00 
-22.61 63.987 
[…]

My problem: The label should be in the middle between two coordinates, but only if the distance between the two coordinates on the resulting chart is greater than 1.5cm. 

I didn't find an appropriate solution in the CookBook at "26. N. Annotation of Contours and “Quoted Lines”". There seems to be no way of achieving this with the algorithms provided. Caution: Please don't underestimate the chances of me not seeing the wood for the trees.

The only idea I currently have is to calculate the midpoints of my airway segments. This would place the labels in the middle with -Sqf..., however it doesn't solve the problem with the desired segment length limitation.

Your ideas are highly welcome.

Regards, 
Kristof


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