Faced problems with too many points: rostopic echo did not work any more (message size probably too large)
Found workaround by using rosbag record -O path.bag /bambi/coverage_path_planner/path together with rostopic echo -b path.bag /bambi/coverage_path_planner/path > data.txt, but sublime was not able to handle multiple cursor usage for that filesize and regex on command line were to cumbersome
Finally decided to implement python ros node that outputs KML format --> /bambi/kml_generator was born
Obtained better results with BSpline that with CatmullRom