s2_interpolate function

Linear referencing

s2_project(x, y, radius = s2_earth_radius_meters())

s2_project_normalized(x, y)

s2_interpolate(x, distance, radius = s2_earth_radius_meters())

s2_interpolate_normalized(x, distance_normalized)

Arguments

• x: A simple polyline geography vector
• y: A simple point geography vector. The point will be snapped to the nearest point on x for the purposes of interpolation.
• radius: Radius of the earth. Defaults to the average radius of the earth in meters as defined by s2_earth_radius_meters().
• distance: A distance along x in radius units.
• distance_normalized: A distance normalized to s2_length() of x.

Returns

• s2_interpolate() returns the point on x, distance meters along the line.

• s2_interpolate_normalized() returns the point on x interpolated to a fraction along the line.

• s2_project() returns the distance that point occurs along x.

• s2_project_normalized() returns the distance_normalized along x

  where point occurs.

Examples

s2_project_normalized("LINESTRING (0 0, 0 90)", "POINT (0 22.5)")
s2_project("LINESTRING (0 0, 0 90)", "POINT (0 22.5)")
s2_interpolate_normalized("LINESTRING (0 0, 0 90)", 0.25)
s2_interpolate("LINESTRING (0 0, 0 90)", 2501890)