Return a temporal circular buffer simplified ensuring that consecutive centers are at least a certain distance or time interval apart

minDistSimplify(tcbuffer,mindist float) → tcbuffer

minTimeDeltaSimplify(tcbuffer,mint interval) → tcbuffer

The simplification operates on the center trajectory of the temporal circular buffer and preserves the radius at each surviving instant. Simplification applies only to temporal sequences or sequence sets with linear interpolation. In all other cases, a copy of the given value is returned.

Return a temporal circular buffer simplified using the Douglas-Peucker algorithm

maxDistSimplify(tcbuffer,maxdist float,syncdist=true) → tcbuffer

douglasPeuckerSimplify(tcbuffer,maxdist float,syncdist=true) → tcbuffer

The difference between the two functions is that maxDistSimplify uses a single-pass version of the algorithm whereas douglasPeuckerSimplify uses the standard recursive algorithm. As for the functions above, the simplification operates on the center trajectory and preserves the radius at each surviving instant.

SELECT asText(douglasPeuckerSimplify(tcbuffer '[Cbuffer(Point(1 1),0.5)@2000-01-01,
  Cbuffer(Point(2 2),0.5)@2000-01-02, Cbuffer(Point(3 1),0.5)@2000-01-03,
  Cbuffer(Point(4 4),0.5)@2000-01-04]', 2.0));
-- {Cbuffer(POINT(1 1),0.5)@2000-01-01 00:00:00+01, Cbuffer(POINT(4 4),0.5)@2000-01-04 00:00:00+01}