Changes between Version 1 and Version 2 of Processing/Boresighting


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Timestamp:
Feb 28, 2012 4:22:17 PM (8 years ago)
Author:
mark1
Comment:

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  • Processing/Boresighting

    v1 v2  
    55Every time the instruments are placed in the aircraft a new boresight flight has to be undertaken over the [wiki:Processing/CalibSite calibration site]. This may just be at the start of the flying season or multiple times throughout the year. At the end of the flying season a boresight flight is undertaken to check if any change has occurred.
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    7 == Hyperspectral Boresight Procedure ==
     7== Hyperspectral Boresight Procedure ==#Hyperspectral
    88
    9 Flight requirements:
     9=== Flight requirements: ===
    1010
    1111 * Multiple flight lines taken along different flight paths
     
    1616Typically we collect fully overlapping flight lines going along the compass directions: N, NE, E, SE, S, SW, W, NW
    1717
    18 Processing technique:
     18=== Processing technique: ===
    1919
     20The first stage of the processing is to remove possible timing offsets due to the [wiki:Processing/Corrections/Timing navigation synchronisation problems]. This is because an along track shift occurs as consequence of the timing error and needs to be resolved first.
    2021
     22When these timing offsets have been identified the boresight procedure can begin. This is currently a case of processing the data with different boresight values (given in roll, pitch and heading angular offsets) and finding a set which appears to minimise location errors for all the flight lines.
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     24As a good starting point it is useful to use the opposite flight direction flight lines to solve for roll and pitch. As a roll error will manifest itself as an across track shift and a pitch error as an along track shift. Be wary though that heading errors will also appear as a mixture of across and along track shifts. Heading errors are best identified using parallel lines with a 50% along track overlap.