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geo.regionApproximate

geo.regionApproximate(
   $region as cts.region,
   $threshold as Number,
   [$options as String[]]
) as cts.region

Summary

This function returns a simplified approximation of the region, using the Douglas-Peucker algorithm. The threshold specifies how close an approximation this should be in the same units as tolerance. The tolerance option should be smaller than the threshold.

Parameters
$region A cts region.
$threshold The threshold.
$options

Options include:

"coordinate-system=name"
Use the named coordinate system. Valid names are wgs84 for the WGS84 coordinate system and raw for the unmapped planar coordinate system
"tolerance"
A tolerance value. For the raw coordinate system, use the units of the coordinate system. For other (geodetic) coordinate systems, use the units specified by the units option. If the tolerance is too fine for the precision, inconsistencies may result and a larger tolerance should be used.
"units=miles"
Distance is measured in miles.

Example

geo.regionApproximate(
  cts.polygon([
    cts.point(0,0),
    cts.point(4,0),
    cts.point(2,10),
    cts.point(2,14),
    cts.point(2,11),
    cts.point(0,4),
    cts.point(0,0)]), 400, ['tolerance=1'])

// => A cts.region with the coordinates 0,0 2,14 2,11 0,0

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