Thank you Adam for your quick reply.

I am using it as

boost::geometry::simplify(orgLineString,simplifiedLineString,maxMoveDistance);

I am assuming that the above code does 2D douglas-Peucker, is it correct?

Thanks,

Suresh

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Suresh Jakka

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**From:** Adam Wulkiewicz [via Boost Geometry] [mailto:ml-node+[hidden email]]

**Sent:** Tuesday, April 12, 2016 1:24 PM

**To:** Suresh Jakka <[hidden email]>

**Subject:** Re: Is simplify algorithm 3D aware

Hi,

Jakka30 wrote:

What we noticed is that, if a point exceeds the max_distance in Z direction, but within the max_distance in x and y, it is still removing that point.

By default simplify() use:

- the default simplify strategy, bg::strategy::simplify::douglas_peucker,

- the default point-segment strategy, in cartesian bg::strategy::distance::projected_point,

- the default point-point strategy, in cartesian bg::strategy::distance::pythagoras,

The first strategy is CS-agnostic and the two other strategies are N-dimensional. The projected_point strategy first calculates the coordinates of a point projected into a segment and then calculates the distance between this point and the original point using
pythagoras strategy. So a point is removed when a distance between this point and a segment created between currently analysed endpoints in douglas_peucker strategy is lesser than max_distance.

Do you have a example where it works in the z direction too?

Just added:
https://github.com/boostorg/geometry/blob/develop/test/algorithms/simplify.cpp#L197

It calls simplify() with the default strategies:
https://github.com/boostorg/geometry/blob/develop/test/algorithms/test_simplify.hpp#L87

Could you share a test case when the behavior is not correct?

Regards,

Adam

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