Note : I have produced 2 pervious videos regarding the video and radar analysis of flight 175. This video is the latest work on the subject and supersedes the previous films. For further related links see below.
The composite image below shows all target data (BT, RT, RB: Beacon Targets, Radar Targets and Radar Reinforced Beacon) as extracted from the data files provided by the NTSB. The raw data files for each radar facility are more than 1 million lines each and must be sorted and reduced into meaningful information before they can be plotted on a map. We have created our own custom software code to handle the data parsing for this task. Latitude and longitude coordinates recorded by the DFDR are used in creating the baseline flightpath, seen below in green. With further processing, these datasets are combined and interpreted to create a more accurate understanding of the events on the accident flight.
New Survey Technique Boosts Bird Flight Analysis
Analysis of Altitude Data
There are six distinct sources of altitude information available for this accident flight. Three of them come from onboard the aircraft via the flight data recorder, they are: Radio Altitude 1, Radio Altitude 2 and Pressure Altitude (Channels 24, 25 and 23 of the DFDR, respectively). In addition, the ASR-9 Radar facility at JFK and the Newark EWR radar site have altitude information recorded which was encoded by the aircraft's static air system. The last source of altitude information is very limited in scope: the video footage that shows the final seconds of flight and splashdown.