project_arc: produce a ring of pseudo-nodes

In mitre/earthtools: Tools for working on planet Earth

Description

It can be useful to add a range ring of nodes to a graph. This function will select such nodes subject to radius and disance constraints. As a general rule the max distance should be twice the max fix distance tolerance so that aircraft "pass by" no more or less than one fix on the ring (assuming they don't double back or fly in at a near tangent heading)

Usage

project_arc(center_latitude, center_longitude, radius, dist_between_points,
  tolerance = 0.01, from_angle = 0, to_angle = 359.999)

Arguments

center_latitude	Numeric. The latitude of the range ring center point.
center_longitude	Numeric. The longitude of the range ring center point.
radius	Numeric. The radius of the arc about the center point in nautical miles.
dist_between_points	Numeric. The maximum distance between points on the range ring. Actual distance is between this upper bound and this minus the tolerance, all in nautical miles.
tolerance	Numeric. How close to the target distance between points do you need to get?
from_angle	Numeric. The angle from the center point to the arc defining the left-most point of the arc.
to_angle	Numeric. The angle from the center point to the arc defining the right-most point of the arc (moving clockwise from the from_angle).

mitre/earthtools documentation built on May 21, 2019, 1:19 p.m.