geo:bearing(
$p1 as cts:point,
$p2 as cts:point,
[$options as xs:string*]
) as xs:double

Summary

Returns the true bearing in radians of the path from the first point
to the second. An error is raised if the two points are the same.

Parameters

p1

The first point.

p2

The second point.

options

Options for the operation. The default is ().

Options include:

"coordinate-system=string"

Use the given coordinate system. Valid values are:

wgs84

The WGS84 coordinate system.

wgs84/double

The WGS84 coordinate system at double precision.

etrs89

The ETRS89 coordinate system.

etrs89/double

The ETRS89 coordinate system at double precision.

raw

The raw (unmapped) coordinate system.

raw/double

The raw coordinate system at double precision.

"precision=value"

Use the coordinate system at the given precision. Allowed values:
float and double.

"units=value"

Unit of measure of the tolerance value. Valid values are
miles (default), km,
feet, meters.

"tolerance=distance"

Tolerance is the largest allowable variation in geometry calculations.
If the distance between two points is less than tolerance, then the two
points are considered equal. For the raw coordinate system, use the units
of the coordinates. For geographic coordinate systems, use the units
specified by the units option.

Usage Notes

The value of the precision option takes precedence over
that implied by the governing coordinate system name, including the
value of the coordinate-system option. For example, if the
governing coordinate system is "wgs84/double" and the precision
option is "float", then the operation uses single precision.

Tolerance reflects how accurate you believe the data is. Computing a
bearing between two points that are effectively equal within the limits
of data accuracy is likely to produce useless results: The tolerance
parameter can be used to force an error in this situation. Effective
tolerance may be limited by the limits of precision.

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