Class B and C Airpsace Ring Data in Text Class B and Class C airspace has multiple rings where each ring can be a custom polygon shape.



I want to extract following data into text:


the shape of these polygon rings in lat/long (ideally a geoJson object)
distance between the rings and
high / low limit for each ring


Is this data available for free or purchase?
For the US, the FAA National Flight Data Center (NFDC) is the place. There is this set of files: Class B,C,D,E Airspace Shape Files, which is free and contains borders of airspaces in the GIS shapefile format.