The UAV ortho-mosaics are turning into an important tool for the development of precision agriculture prescription strategies, in particular for site specific weed management (SSWM). The UAV platforms are able to take remote images at a very high spatial resolution. This high spatial resolution is necessary for SSWM at early grow stages which requires to discriminate small plants (crops and weeds) that can not be detected using other kind of remote platforms. Little changes in flight altitude can cause important differences in the final spatial resolution. Furthermore, a decrease of the flying altitude reduces the area covered by each single image; which implies an increment of both the sequence of images and the complexity of the image mosaicking to obtain a cover of the whole study area. On the other hand, prescription control maps need geo-referenciation accuracy in agreement to the details of the objectives that we want to discriminate. Consequently, it is necessary to find a balance between spatial resolution (which depends on flying height and kind of sensor) and geo-referenciation accuracy. This study investigated the geometric accuracy differences among ortho-mosaics created from UAV images series taken at three different flight altitudes (30, 60 and 100 m). Results did not show relevant differences in geo-referenciation accuracy on the interval studied, so that, the most important parameter to take into account when choosing the flying altitude is the needed spatial resolution rather than the geo-referenciation accuracy.


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    Title :

    Mosaicking UAV imagery for precision agriculture purposes: Effect of flying altitude




    Publication date :

    2012


    Size :

    6 Seiten, Bilder, 1 Tabelle, 10 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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