High-accuracy direct aerial platform orientation with tightly coupled GPS/INS system : executive summary.
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High-accuracy direct aerial platform orientation with tightly coupled GPS/INS system : executive summary.

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    Executive summary.
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  • Abstract:
    Obtaining sensor orientation by direct measurements is

    a rapidly emerging mapping technology. Modern GPS

    and INS systems allow for the direct determination of

    platform position and orientation at an unprecedented

    accuracy. In airborne surveying, aircraft trajectory and

    platform orientation can be determined at the level of

    few cm and 20-30 arcsec, respectively at an almost

    continuous time scale. The use of such integrated

    GPS/INS systems offers immediate benefits for largeformat

    camera-based airborne surveying by

    substantially reducing the need for ground control and

    by basically eliminating aerial-triangulation, except for

    system calibration. For emerging sensors such as

    LIDAR, RADAR, multi-/hyperspectral imagers,

    however, the use of the direct orientation systems is

    mandatory since indirect methods such as control

    point-based aerial-triangulation are not feasible.

    ODOT Aerial Engineering has been operating an

    airplane with a large-format Zeiss Jena LMK2000

    camera. The introduction of a modern GPS/INS-based

    direct orientation system was not only highly desirable

    for economic reasons, but also mandatory if ODOT

    wanted to keep up with technological developments.

    Since ODOT predominantly performs corridor surveys

    over the highway infrastructure, the use of direct

    orientation makes it even more attractive in this case,

    since the savings due to the elimination of control

    points are quite substantial. By establishing a

    GPS/INS-based direct orientation technology for

    ODOT aerial operations, the foundations was given for

    future imaging sensor extensions such as the

    introduction of LIDAR systems or the like.

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