Özet:

In this study, it is aimed to calculate the plant height of durum wheat variety on three different dates using unmanned aerial vehicles (UAV) with different characteristics semi-automatically. The study was carried out in April, which is the period when wheat passes from vegetative to generative period and which is also considered the most suitable date in remote sensing studies for the Mediterranean region. Unmanned aerial vehicle data were obtained in three different date intervals in April, and ground measurements were made simultaneously with the UAV shots. The data obtained from the unmanned aerial vehicles were taken from a height of 10 m and with appropriate overlap ratios. All aerial photographs were processed using the same procedures for the production of orthomosaic images, digital surface models (DSM) and digital terrain models (DTM). In the study, while determining the parcel boundaries of the trials on very high-resolution orthomosaic images, plant heights were calculated with the normalized digital surface model (nDSM) obtained by using DSM and DTM data. At the end of the study, the plant heights calculated semi-automatically were compared with the plant heights measured in the field in the same area. As a result of the statistical analysis between the calculated plant height values and field measurement values, the highest correlation was found (r= 0.948) for Phantom 3 Advanced UAV on April 16, 2020; (r= 0.886) for Mavic Pro UAV on April 10, 2020; (r= 0.924) for Inspire 2 UAV on April 22, 2020. According to the result of the research, it has been revealed that the plant height can be determined safely with unmanned aerial vehicles with different characteristics.

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