Export problems

[SoulofAO]

Good day.
A question has arisen and I will be grateful for your help. I am writing a Heightmap generator based on tourist maps. A heightmap is a texture where the whitest color is the highest point on the map and vice versa. I need the Heightmap generator, since I am working on a project for an orienteering simulator, but with importing my own maps with a "one button".Or at least minimizing the time for import. Here are the first results:

https://www.youtube.com/watch?v=mFEs2fQZu_4

However, I have a problem. I was guided by the BNA format because of its convenience and it is used in my import. However, I ran into the problem that the serifs on the terrain horizontals are represented in BNA by a single coordinate. Which is why I'm stuck in the last stage of the program. Since the BNA format turned out to be limited, I can't use it. And I want to write either my own Export or read ocd files directly. To do this, I planned to study the Open Orientiring Mapper code and find the parsing code. Perhaps you could point out where I should start?

Configuration

Mapper Version: 0.9.5
Operating System: Windows.