Remarks

Returns the azimuth, at the first point, of the line segment from the first point to the second. The azimuth is in degrees, clockwise from true north. The point list should contain exactly 2 points.

The line type affects accuracy and speed

All line types in the LineType enumeration are supported.

If the map projection is non-georeferenced, then the azimuth is just calculated in the x/y plane in degrees clockwise from the positive y-axis - since the y-axis will then have an unknown relation to true north, the method accuracy will be unknown. Otherwise, the points are unprojected to LongLat before the azimuth is computed from the longitudes and latitudes, and the accuracy depends on the line type. The error bounds below do not include errors that may be caused by the unprojection, but that is a concern only for unusual map projections like the NewZealandMapGridProjection and the LabordeObliqueMercatorProjection.

RhumbLine

The line segment is regarded as a curve of constant azimuth, known as a rhumb line or loxodrome. The Earth is modelled as an ellipsoid, and the method accuracy is 0.00003 arc seconds.

GreatCircle

The line segment is regarded as a great-circle segment, also known as a shortest route or geodesic route. The Earth is modelled as an ellipsoid, and the method accuracy is 0.00003 arc seconds.

Straight3D

The line segment is regarded as a straight line in 3D space, and the result is calculated with high accuracy. The result will not differ much from the result of using the GreatCircle line type, except if the line segment is very long.

GreatCircleApprox

The line segment is regarded as a great-circle segment. But the Earth is modelled as a sphere, with a local compensation used for the flattening of the earth, which means that the accuracy is best for short line segments. The following error bounds hold:

The extreme error in the final row occurs, for example, with a starting point at the equator, and an end point that is 10 km west of the antipode. The method thinks that the shortest route follows the equator. However, due to the flattening of the earth, a route that goes near a pole would be about 23 km shorter.

Relative speed

If the projection is already LongLat, then the computation time for GreatCircle will normally be about 2.4 times longer than for GreatCircleApprox.

Remarks

Returns the azimuth at start of the line segment from start to end. The azimuth is in degrees, clockwise from true north.

All line types in the LineType enumeration are supported.

If the map projection is non-georeferenced, then the azimuth is just calculated in the x/y plane in degrees clockwise from the positive y-axis - since the y-axis will then have an unknown relation to true north, the method accuracy will be unknown. Otherwise, the points are unprojected to LongLat before the azimuth is computed from the longitudes and latitudes, and the accuracy depends on the line type. The error bounds below do not include errors that may be caused by the unprojection, but that is a concern only for unusual map projections like the NewZealandMapGridProjection and the LabordeObliqueMercatorProjection.

RhumbLine

The line segment is regarded as a curve of constant azimuth, known as a rhumb line or loxodrome. The Earth is modelled as an ellipsoid, and the method accuracy is 0.00003 arc seconds.

GreatCircle

The line segment is regarded as a great-circle segment, also known as a shortest route or geodesic route. The Earth is modelled as an ellipsoid, and the method accuracy is 0.00003 arc seconds.

Straight3D

The line segment is regarded as a straight line in 3D space, and the result is calculated with high accuracy. The result will not differ much from the result of using the GreatCircle line type, except if the line segment is very long.

GreatCircleApprox

The line segment is regarded as a great-circle segment. But the Earth is modelled as a sphere, with a local compensation used for the flattening of the earth, which means that the accuracy is best for short line segments. The following error bounds hold:

The extreme error in the final row occurs, for example, with a starting point at the equator, and an end point that is 10 km west of the antipode. The method thinks that the shortest route follows the equator. However, due to the flattening of the earth, a route that goes near a pole would be about 23 km shorter.

Relative speed

If the projection is already LongLat, then the computation time for GreatCircle will normally be about 2.4 times longer than for GreatCircleApprox.

Remarks

Returns the azimuth, at the first point, of the line segment from the first point to the second. The azimuth is in degrees, clockwise from true north. The point list should contain exactly 2 points.

The line type affects accuracy and speed

All line types in the LineType enumeration are supported.

If the map projection is non-georeferenced, then the azimuth is just calculated in the x/y plane in degrees clockwise from the positive y-axis - since the y-axis will then have an unknown relation to true north, the method accuracy will be unknown. Otherwise, the points are unprojected to LongLat before the azimuth is computed from the longitudes and latitudes, and the accuracy depends on the line type. The error bounds below do not include errors that may be caused by the unprojection, but that is a concern only for unusual map projections like the NewZealandMapGridProjection and the LabordeObliqueMercatorProjection.

RhumbLine

The line segment is regarded as a curve of constant azimuth, known as a rhumb line or loxodrome. The Earth is modelled as an ellipsoid, and the method accuracy is 0.00003 arc seconds.

GreatCircle

The line segment is regarded as a great-circle segment, also known as a shortest route or geodesic route. The Earth is modelled as an ellipsoid, and the method accuracy is 0.00003 arc seconds.

Straight3D

The line segment is regarded as a straight line in 3D space, and the result is calculated with high accuracy. The result will not differ much from the result of using the GreatCircle line type, except if the line segment is very long.

GreatCircleApprox

The line segment is regarded as a great-circle segment. But the Earth is modelled as a sphere, with a local compensation used for the flattening of the earth, which means that the accuracy is best for short line segments. The following error bounds hold:

The extreme error in the final row occurs, for example, with a starting point at the equator, and an end point that is 10 km west of the antipode. The method thinks that the shortest route follows the equator. However, due to the flattening of the earth, a route that goes near a pole would be about 23 km shorter.

Relative speed

If the projection is already LongLat, then the computation time for GreatCircle will normally be about 2.4 times longer than for GreatCircleApprox.

Remarks

Returns the azimuth, at the first point, of the line segment from the first point to the second. The azimuth is in degrees, clockwise from true north. The point list should contain exactly 2 points.

The line type affects accuracy and speed

All line types in the LineType enumeration are supported.

If the map projection is non-georeferenced, then the azimuth is just calculated in the x/y plane in degrees clockwise from the positive y-axis - since the y-axis will then have an unknown relation to true north, the method accuracy will be unknown. Otherwise, the points are unprojected to LongLat before the azimuth is computed from the longitudes and latitudes, and the accuracy depends on the line type. The error bounds below do not include errors that may be caused by the unprojection, but that is a concern only for unusual map projections like the NewZealandMapGridProjection and the LabordeObliqueMercatorProjection.

RhumbLine

The line segment is regarded as a curve of constant azimuth, known as a rhumb line or loxodrome. The Earth is modelled as an ellipsoid, and the method accuracy is 0.00003 arc seconds.

GreatCircle

The line segment is regarded as a great-circle segment, also known as a shortest route or geodesic route. The Earth is modelled as an ellipsoid, and the method accuracy is 0.00003 arc seconds.

Straight3D

The line segment is regarded as a straight line in 3D space, and the result is calculated with high accuracy. The result will not differ much from the result of using the GreatCircle line type, except if the line segment is very long.

GreatCircleApprox

The line segment is regarded as a great-circle segment. But the Earth is modelled as a sphere, with a local compensation used for the flattening of the earth, which means that the accuracy is best for short line segments. The following error bounds hold:

The extreme error in the final row occurs, for example, with a starting point at the equator, and an end point that is 10 km west of the antipode. The method thinks that the shortest route follows the equator. However, due to the flattening of the earth, a route that goes near a pole would be about 23 km shorter.

Relative speed

If the projection is already LongLat, then the computation time for LineTypeGreatCircle will normally be about 2.4 times longer than for LineTypeGreatCircleApprox.

Remarks

Returns the azimuth, at the first point, of the line segment from the first point to the second. The azimuth is in degrees, clockwise from true north. The point list should contain exactly 2 points.

The line type affects accuracy and speed

All line types in the LineType enumeration are supported.

If the map projection is non-georeferenced, then the azimuth is just calculated in the x/y plane in degrees clockwise from the positive y-axis - since the y-axis will then have an unknown relation to true north, the method accuracy will be unknown. Otherwise, the points are unprojected to LongLat before the azimuth is computed from the longitudes and latitudes, and the accuracy depends on the line type. The error bounds below do not include errors that may be caused by the unprojection, but that is a concern only for unusual map projections like the NewZealandMapGridProjection and the LabordeObliqueMercatorProjection.

RhumbLine

The line segment is regarded as a curve of constant azimuth, known as a rhumb line or loxodrome. The Earth is modelled as an ellipsoid, and the method accuracy is 0.00003 arc seconds.

GreatCircle

The line segment is regarded as a great-circle segment, also known as a shortest route or geodesic route. The Earth is modelled as an ellipsoid, and the method accuracy is 0.00003 arc seconds.

Straight3D

The line segment is regarded as a straight line in 3D space, and the result is calculated with high accuracy. The result will not differ much from the result of using the GreatCircle line type, except if the line segment is very long.

GreatCircleApprox

The line segment is regarded as a great-circle segment. But the Earth is modelled as a sphere, with a local compensation used for the flattening of the earth, which means that the accuracy is best for short line segments. The following error bounds hold:

The extreme error in the final row occurs, for example, with a starting point at the equator, and an end point that is 10 km west of the antipode. The method thinks that the shortest route follows the equator. However, due to the flattening of the earth, a route that goes near a pole would be about 23 km shorter.

Relative speed

If the projection is already LongLat, then the computation time for LineTypeGreatCircle will normally be about 2.4 times longer than for LineTypeGreatCircleApprox.

Remarks

Returns the azimuth at start of the line segment from start to end. The azimuth is in degrees, clockwise from true north.

All line types in the LineType enumeration are supported.

If the map projection is non-georeferenced, then the azimuth is just calculated in the x/y plane in degrees clockwise from the positive y-axis - since the y-axis will then have an unknown relation to true north, the method accuracy will be unknown. Otherwise, the points are unprojected to LongLat before the azimuth is computed from the longitudes and latitudes, and the accuracy depends on the line type. The error bounds below do not include errors that may be caused by the unprojection, but that is a concern only for unusual map projections like the NewZealandMapGridProjection and the LabordeObliqueMercatorProjection.

RhumbLine

The line segment is regarded as a curve of constant azimuth, known as a rhumb line or loxodrome. The Earth is modelled as an ellipsoid, and the method accuracy is 0.00003 arc seconds.

GreatCircle

The line segment is regarded as a great-circle segment, also known as a shortest route or geodesic route. The Earth is modelled as an ellipsoid, and the method accuracy is 0.00003 arc seconds.

Straight3D

The line segment is regarded as a straight line in 3D space, and the result is calculated with high accuracy. The result will not differ much from the result of using the GreatCircle line type, except if the line segment is very long.

GreatCircleApprox

The line segment is regarded as a great-circle segment. But the Earth is modelled as a sphere, with a local compensation used for the flattening of the earth, which means that the accuracy is best for short line segments. The following error bounds hold:

The extreme error in the final row occurs, for example, with a starting point at the equator, and an end point that is 10 km west of the antipode. The method thinks that the shortest route follows the equator. However, due to the flattening of the earth, a route that goes near a pole would be about 23 km shorter.

Relative speed

If the projection is already LongLat, then the computation time for LineTypeGreatCircle will normally be about 2.4 times longer than for LineTypeGreatCircleApprox.

Remarks

Returns the azimuth, at the first point, of the line segment from the first point to the second. The azimuth is in degrees, clockwise from true north. The point list should contain exactly 2 points.

The line type affects accuracy and speed

All line types in the LineType enumeration are supported.

If the map projection is non-georeferenced, then the azimuth is just calculated in the x/y plane in degrees clockwise from the positive y-axis - since the y-axis will then have an unknown relation to true north, the method accuracy will be unknown. Otherwise, the points are unprojected to LongLat before the azimuth is computed from the longitudes and latitudes, and the accuracy depends on the line type. The error bounds below do not include errors that may be caused by the unprojection, but that is a concern only for unusual map projections like the NewZealandMapGridProjection and the LabordeObliqueMercatorProjection.

RhumbLine

The line segment is regarded as a curve of constant azimuth, known as a rhumb line or loxodrome. The Earth is modelled as an ellipsoid, and the method accuracy is 0.00003 arc seconds.

GreatCircle

The line segment is regarded as a great-circle segment, also known as a shortest route or geodesic route. The Earth is modelled as an ellipsoid, and the method accuracy is 0.00003 arc seconds.

Straight3D

The line segment is regarded as a straight line in 3D space, and the result is calculated with high accuracy. The result will not differ much from the result of using the GreatCircle line type, except if the line segment is very long.

GreatCircleApprox

The line segment is regarded as a great-circle segment. But the Earth is modelled as a sphere, with a local compensation used for the flattening of the earth, which means that the accuracy is best for short line segments. The following error bounds hold:

The extreme error in the final row occurs, for example, with a starting point at the equator, and an end point that is 10 km west of the antipode. The method thinks that the shortest route follows the equator. However, due to the flattening of the earth, a route that goes near a pole would be about 23 km shorter.

Relative speed

If the projection is already LongLat, then the computation time for GREATCIRCLE will normally be about 2.4 times longer than for GREATCIRCLEAPPROX.

Remarks

Returns the azimuth at start of the line segment from start to end. The azimuth is in degrees, clockwise from true north.

All line types in the LineType enumeration are supported.

If the map projection is non-georeferenced, then the azimuth is just calculated in the x/y plane in degrees clockwise from the positive y-axis - since the y-axis will then have an unknown relation to true north, the method accuracy will be unknown. Otherwise, the points are unprojected to LongLat before the azimuth is computed from the longitudes and latitudes, and the accuracy depends on the line type. The error bounds below do not include errors that may be caused by the unprojection, but that is a concern only for unusual map projections like the NewZealandMapGridProjection and the LabordeObliqueMercatorProjection.

RhumbLine

The line segment is regarded as a curve of constant azimuth, known as a rhumb line or loxodrome. The Earth is modelled as an ellipsoid, and the method accuracy is 0.00003 arc seconds.

GreatCircle

The line segment is regarded as a great-circle segment, also known as a shortest route or geodesic route. The Earth is modelled as an ellipsoid, and the method accuracy is 0.00003 arc seconds.

Straight3D

The line segment is regarded as a straight line in 3D space, and the result is calculated with high accuracy. The result will not differ much from the result of using the GreatCircle line type, except if the line segment is very long.

GreatCircleApprox

The line segment is regarded as a great-circle segment. But the Earth is modelled as a sphere, with a local compensation used for the flattening of the earth, which means that the accuracy is best for short line segments. The following error bounds hold:

The extreme error in the final row occurs, for example, with a starting point at the equator, and an end point that is 10 km west of the antipode. The method thinks that the shortest route follows the equator. However, due to the flattening of the earth, a route that goes near a pole would be about 23 km shorter.

Relative speed

If the projection is already LongLat, then the computation time for GREATCIRCLE will normally be about 2.4 times longer than for GREATCIRCLEAPPROX.

Remarks

Returns the azimuth, at the first point, of the line segment from the first point to the second. The azimuth is in degrees, clockwise from true north. The point list should contain exactly 2 points.

The line type affects accuracy and speed

All line types in the LineType enumeration are supported.

If the map projection is non-georeferenced, then the azimuth is just calculated in the x/y plane in degrees clockwise from the positive y-axis - since the y-axis will then have an unknown relation to true north, the method accuracy will be unknown. Otherwise, the points are unprojected to LongLat before the azimuth is computed from the longitudes and latitudes, and the accuracy depends on the line type. The error bounds below do not include errors that may be caused by the unprojection, but that is a concern only for unusual map projections like the NewZealandMapGridProjection and the LabordeObliqueMercatorProjection.

RhumbLine

The line segment is regarded as a curve of constant azimuth, known as a rhumb line or loxodrome. The Earth is modelled as an ellipsoid, and the method accuracy is 0.00003 arc seconds.

GreatCircle

The line segment is regarded as a great-circle segment, also known as a shortest route or geodesic route. The Earth is modelled as an ellipsoid, and the method accuracy is 0.00003 arc seconds.

Straight3D

The line segment is regarded as a straight line in 3D space, and the result is calculated with high accuracy. The result will not differ much from the result of using the GreatCircle line type, except if the line segment is very long.

GreatCircleApprox

The line segment is regarded as a great-circle segment. But the Earth is modelled as a sphere, with a local compensation used for the flattening of the earth, which means that the accuracy is best for short line segments. The following error bounds hold:

The extreme error in the final row occurs, for example, with a starting point at the equator, and an end point that is 10 km west of the antipode. The method thinks that the shortest route follows the equator. However, due to the flattening of the earth, a route that goes near a pole would be about 23 km shorter.

Relative speed

If the projection is already LongLat, then the computation time for GREATCIRCLE will normally be about 2.4 times longer than for GREATCIRCLEAPPROX.

Remarks

Returns the azimuth, at the first point, of the line segment from the first point to the second. The azimuth is in degrees, clockwise from true north. The point list should contain exactly 2 points.

The line type affects accuracy and speed

All line types in the LineType enumeration are supported.

If the map projection is non-georeferenced, then the azimuth is just calculated in the x/y plane in degrees clockwise from the positive y-axis - since the y-axis will then have an unknown relation to true north, the method accuracy will be unknown. Otherwise, the points are unprojected to LongLat before the azimuth is computed from the longitudes and latitudes, and the accuracy depends on the line type. The error bounds below do not include errors that may be caused by the unprojection, but that is a concern only for unusual map projections like the NewZealandMapGridProjection and the LabordeObliqueMercatorProjection.

RhumbLine

The line segment is regarded as a curve of constant azimuth, known as a rhumb line or loxodrome. The Earth is modelled as an ellipsoid, and the method accuracy is 0.00003 arc seconds.

GreatCircle

The line segment is regarded as a great-circle segment, also known as a shortest route or geodesic route. The Earth is modelled as an ellipsoid, and the method accuracy is 0.00003 arc seconds.

Straight3D

The line segment is regarded as a straight line in 3D space, and the result is calculated with high accuracy. The result will not differ much from the result of using the GreatCircle line type, except if the line segment is very long.

GreatCircleApprox

The line segment is regarded as a great-circle segment. But the Earth is modelled as a sphere, with a local compensation used for the flattening of the earth, which means that the accuracy is best for short line segments. The following error bounds hold:

The extreme error in the final row occurs, for example, with a starting point at the equator, and an end point that is 10 km west of the antipode. The method thinks that the shortest route follows the equator. However, due to the flattening of the earth, a route that goes near a pole would be about 23 km shorter.

Relative speed

If the projection is already LongLat, then the computation time for LineType.GreatCircle will normally be about 2.4 times longer than for LineType.GreatCircleApprox.

Remarks

Returns the azimuth at start of the line segment from start to end. The azimuth is in degrees, clockwise from true north.

All line types in the LineType enumeration are supported.

If the map projection is non-georeferenced, then the azimuth is just calculated in the x/y plane in degrees clockwise from the positive y-axis - since the y-axis will then have an unknown relation to true north, the method accuracy will be unknown. Otherwise, the points are unprojected to LongLat before the azimuth is computed from the longitudes and latitudes, and the accuracy depends on the line type. The error bounds below do not include errors that may be caused by the unprojection, but that is a concern only for unusual map projections like the NewZealandMapGridProjection and the LabordeObliqueMercatorProjection.

RhumbLine

The line segment is regarded as a curve of constant azimuth, known as a rhumb line or loxodrome. The Earth is modelled as an ellipsoid, and the method accuracy is 0.00003 arc seconds.

GreatCircle

The line segment is regarded as a great-circle segment, also known as a shortest route or geodesic route. The Earth is modelled as an ellipsoid, and the method accuracy is 0.00003 arc seconds.

Straight3D

The line segment is regarded as a straight line in 3D space, and the result is calculated with high accuracy. The result will not differ much from the result of using the GreatCircle line type, except if the line segment is very long.

GreatCircleApprox

The line segment is regarded as a great-circle segment. But the Earth is modelled as a sphere, with a local compensation used for the flattening of the earth, which means that the accuracy is best for short line segments. The following error bounds hold:

The extreme error in the final row occurs, for example, with a starting point at the equator, and an end point that is 10 km west of the antipode. The method thinks that the shortest route follows the equator. However, due to the flattening of the earth, a route that goes near a pole would be about 23 km shorter.

Relative speed

If the projection is already LongLat, then the computation time for LineType.GreatCircle will normally be about 2.4 times longer than for LineType.GreatCircleApprox.