ellipsoidal-metrics-non-classic.md

copyright	lastupdated	subcollection
years 2017, 2020	2020-01-08	AnalyticsEngine

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Using ellipsoidal metrics

{: #ellipsoidal-metrics}

You can use ellipsoidal metrics to calculate the distance between points.

Examples of metrics you can compute:

• Compute the radians between two points using azimuth:

  >>> p1 = stc.point(47.1, -73.5)
  >>> p2 = stc.point(47.6, -72.9)
  >>> stc.eg_metric.azimuth(p1, p2)
  0,6802979449118038
  

• Compute the distance between two points in the units of the underlying data (typically in meters):

  >>> eg_metric.distance(p1, p2)
  71730,66213673435
  

• Compute the landing point given a starting point, a heading (in radians), and the distance in the units of the underlying data (typically in meters):

  >>> point = p1
  >>> heading = eg_metric.azimuth(p1, p2)
  >>> distance = eg_metric.distance(p1, p2)
  >>> eg_metric.destination_point(p1, heading, distance)
  Point(47.60000000001233, -72.89999999998498)