Without looking at the calcs in detail, I would say that you should convert the data (if size is not prohibitive) to a hash where each key is the aircraft ID and the value is an array hashes containing the other data points from each row with that aircraft ID.

You can then easily loop over the aircraft IDs. Assuming the data rows are already sorted by time it should be a relatively simple matter to step through the array items at that point calculating the deltas.

You must always remember that the primary goal is to drain the swamp even when you are hip-deep in alligators.

In reply to Re^5: Calculate aircraft headings from GPS data for google kml display by boftx
in thread Calculate aircraft headings from GPS data for google kml display by hujunsimon

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