In little_navmap_navigraph.sqlite boundary geometry data, How can I parse this datas by python? Because I want to add some airspace in it. I have already try to use python(shapely) wkt to parse, but it seems not this format.

It is a very simple binary format. First unsigned 32 bit int is number of lat/long pairs followed by the lat/long pairs as 32 bit floating points.

The geometry is prepared in LNM when compiling and does not contain any structures defining circles or arcs. It is just a polygon.

This class is used to read and write the data: https://github.com/albar965/atools/blob/release/4.0/src/fs/common/binarygeometry.cpp

Alex