[Qgis-user] Circular Lines in QGIS

[Alexandre Neto]

Check the arrow line renderer on QGIS 3. I think it does what you are
looking for.

A qua, 26/09/2018, 23:04, Adam Dershowitz <dersh at alum.mit.edu> escreveu:

> No, they aren’t great circle.  For example, look at the route from Boston
> to Denver, and then from New York to Denver.  One goes far south (over
> Atlanta), and the other goes way north (over Canada), but both great circle
> routes should be fairly close to each other.  They start at cities that are
> perhaps 200 miles apart, and the middle of the routes are 700 miles apart,
> to get to the same location.
>
>
> --Adam
>
>
>
> On Sep 26, 2018, at 5:54 PM, Wolstan H M Dixie <
> wolstan-dixie at hotmail.co.uk> wrote:
>
> I don't know but am guessing, but aren't those lines not just *any*
> circular arcs, but the actual great-circle paths (the shortest line between
> two points on the surface of a globe) plotted onto that map projection?
> Some of them towards the edges aren't circular.
>
> On 26/09/2018 21:34, C Hamilton wrote:
>
> I had a user request Circular Lines in the Shape Tools plugin and they
> gave the following example.
>
> https://www.stayaspensnowmass.com/sites/default/files/aspenFlightMap.jpg
>
> I don't know how one would do this type of drawing. Does anyone have any
> ideas? It draws the lines trying to avoid overlapping other lines in a very
> pleasing manner. Doing this is probably outside the scope of the Shape
> Tools plugin, but I just wanted to ask to see if there is a relatively easy
> algorithmic way of drawing these types of lines between two points.
>
> Thanks,
>
> Calvin
>
>
>
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-- 
Alexandre Neto
---------------------
@AlexNetoGeo
http://sigsemgrilhetas.wordpress.com
http://gisunchained.wordpress.com
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