Calculate the angles between subsequent 2-D coordinates using Great Circle distance (spherical) methods.
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trip object, or matrix of 2-columns, with x/y coordinates
x is a trip object, the return result has an extra element for the
start and end point of each individual trip, with value NA.
This is an optimized hybrid of "raster::bearing" and "maptools::gzAzimuth". New code is in the traipse package.
Vector of angles (degrees) between coordinates.
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