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Do not use the MapNode classes, unless you know what you want to do with them.

To read octree files, either use AbstractOcTree::read(filename) as factory or the contstructor you already use.

To write, simply call tree->write("octree.ot") or tree->writeBinary("binaryTree.bt"). Check the online documentation for further details.

As a side note, there is some unfinished code for your purpose in the file "src/edit_octree.cpp" in OctoMap that you can use as a basis. If you have patches to contribute back (see the octomap trac) then I will gladly include them!