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FSX Airport runway data structure

charlymorton

charlymorton

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unitedkingdom
I'm struggling to read parts of the airport runway data, specifically runway length and width, in FSX AFCAD files.

I'm following the information in Winfried Orthmann's FSX File Format document and I've identified the bytes for both runway length and width, but I'm unsure how to calculate it, as the calculations seem to differ depending on the length/width.

They both appear to be calculated using the following formula length (or width) = 0x........ / (2 ^ y) - z, but both y and z vary depending on the 0x........ value, making it very difficult to calculate without comparing the 0x........ value for two lengths/widths which are very close to each other.

Does anyone know how runway length/width is calculated? I've not look to see if the issue would be the same for taxiway width, but I have a feeling it might be.
 
If you have the correct bytes then there is no calculation as such. There are four bytes that represent a single (float) type and this is the dimension in meters.

The length starts at offset 0x20 (dec 32) and width starts at offset 0x24 (dec 36) In ADE (C#) I use the following to extract the float value:

runwayLength = BitConverter.ToSingle(rawData, 32);
runwayWidth = BitConverter.ToSingle(rawData, 36);

Where BitConverter is a NET class and rawdata is the byte array for the runway
 
Thanks Jon,

The documentation did state the values were float and using an online bit converter to decimal site, confirms I did have the right bytes. Now I just have to find the equivalent function in Ruby. I seem to remember being able to read the length/width without any problems in vb.net.
 
Sorted, got it working by using the unpack("g") function in Ruby. Thanks for pointing me in the right direction. :)
 
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