The data is unadjusted in the sense that nothing has been done to it other than to convert pressure to feet, using standard atmosphere. If you can convert pressure to feet, you can convert backwards from feet to pressure.
The recorded "altitude" of Dulles was 40 feet. Using standard atmosphere this calculates to 29.88 inch Hg. Then using known actual atmosphere this converts to 312.8 feet, which seems about right for Dulles.
Similarly at the end of the flight the raw altitude, -99 feet, calculates to 180 feet. The radio altitude is about 56 feet thus the difference is 124 feet.
Last edited by gravity32; 15th Sep 2011 at 13:04.
Reason: correct typo - 312.8 ft