I have the necessity to draw on a sphere (earth) an air corridor. In the cartesian plane, this corridor is made by some circles and from outer tangents that connect these circles as you can see in ...
I'm having issues displaying 'great circles' paths and polygons in ggmap, an extension of ggplot2. Please enter the following code to replicate my issues: ...
How can I get line features to appear as great circles on a map, instead of straight lines? Thanks,
My data frame consist in a list of projects, and everyone of them has a central node and several no-central nodes (I plot them with a function "map_points"). I want to connect this central node with ...