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Given a start point, initial bearing (direction), and distance, this function computes the destination point travelling along a the shortest path on an ellipsoid (the geodesic).
● Data Source:
CranContrib
● Keywords: spatial
● Alias: destPoint
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Test if a point is on a great circle defined by two other points.
● Data Source:
CranContrib
● Keywords: spatial
● Alias: onGreatCircle
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Plot polygons with arrow heads on each line segment, pointing towards the next vertex. This shows the direction of each line segment.
● Data Source:
CranContrib
● Keywords: methods, spatial
● Alias: plotArrows
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mean location for spherical (longitude/latitude) coordinates that deals with the angularity. I.e., the mean of longitudes -179 and 178 is 179.5
● Data Source:
CranContrib
● Keywords: methods, spatial
● Alias: geomean
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makePoly
(Package: geosphere) :
Add vertices to a polygon or line
Make a polygon or line by adding intermedate points (vertices) on the great circles inbetween the points supplied. This can be relevant when vertices are relatively far apart. It can make the shape of the object to be accurate, when plotted on a plane. makePoly will also close the polygon if needed.
● Data Source:
CranContrib
● Keywords: methods, spatial
● Alias: makeLine, makePoly
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Get points on a great circle as defined by a point and an initial bearing
● Data Source:
CranContrib
● Keywords: spatial
● Alias: greatCircleBearing
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The "along track distance" is the distance from the start point (p1) to the closest point on the path to a third point (p3), following a great circle path defined by points p1 and p2. See dist2gc for the "cross track distance"
● Data Source:
CranContrib
● Keywords: spatial
● Alias: alongTrackDistance
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span
(Package: geosphere) :
Span of polygons
Compute the approximate surface span of polygons in longitude and latitude direction. Span is computed by rasterizing the polygons; and precision increases with the number of 'scan lines'. You can either use a fixed number of scan lines for each polygon, or a fixed band-width.
● Data Source:
CranContrib
● Keywords: methods, spatial
● Alias: span, span,SpatialPolygons-method, span,matrix-method
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The shortest distance between points and polylines or polygons.
● Data Source:
CranContrib
● Keywords: spatial
● Alias: dist2Line
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Get the two points where two great cricles cross each other. In this function, great circles are defined by a points and an initial bearing. In function gcIntersect they are defined by two sets of points.
● Data Source:
CranContrib
● Keywords: spatial
● Alias: gcIntersectBearing
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providing 
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