IDENTIFICATION OF STRUCTURAL CHANGES CAUSED BY WEED INFECTION IN AGRICULTURE BY OPTICAL AND RADAR DATA

摘要

In most cases the healthy, weed-free cropland has arnregular geometric structure determined by sowingrntechnique and plant-to-plant distances. Several plantrndiseases and weed infections can cause disorders andrnstructural changes in cropland. According to ourrnexperience, this type of geometrical changes can bernwell detected by using polarimetric radar imagesrn(RADARSAT2, ALOS PALSAR) with differentrnpolarizations (dual, quad) and wavelengths (C, Lrnband).rnWe analyze agricultural damages resulting in structuralrnchanges in different croplands. In this paper wernpropose to complete the methodology of identifyingrnthese agricultural damages based on the integrated usernof optical and radar satellite images. We focused onrnthe detection of ragweed infection on sunflower lands.rnAccording to our results it is possible to develop arnmethodology based on the quantitative evaluation ofrnpolarimetric features which enables us to identifyrnragweed infected sunflower lands before the beginningrnof pollen scattering (beginning of August).