An image-based remote sensing system was configured on an agricultural spray plane. The system uses a video mapping system (VMS) for continuous georeferencing of images obtained by digital video. Three differential Global Positioning System (GPS) configurations and one non-differential system, dedicated to the imaging system, were evaluated in parallel with the plane's GPS to judge useable accuracy of a GPS/VMS combination when flying at altitudes of 21 to 420 m (70 to 1400 ft). Positioning accuracy was determined by comparing data from the GPS and video mapping system on the airplane to precise GPS data on the ground. One differential GPS configuration and the non-differential GPS performed best and had fewest problems updating a position fix. Over four field sections flown, differences in position ranged from -66 to +39 m (-216 to +128 ft) using the differential GPS and from -11 to +83 m (-36 to +272 ft) using the non-differential GPS in separate tests. Differential correction was not necessary for reasonable accuracy within system limitations, but accuracy was frequently influenced by user subjectivity when locating points using the video mapping software. The system should find its greatest utility where field areas cannot be georeferenced using landmarks or other reference points, as would be the case for low-altitude remote sensing over large field areas.


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    Title :

    Continuous georeferencing for video-based remote sensing on agricultural aircraft


    Contributors:

    Published in:

    Transactions of the ASAE ; 45 , 4 ; 1177-1189


    Publication date :

    2002


    Size :

    13 Seiten, 24 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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