Influence of Vineyard Topography on Actual Evapotranspiration Using Uav in Southern Brazil

Abstract

Several factors influence the actual evapotranspiration (ETa) estimation in the 'Serra Gaúcha' region conditioned by the micro topography. This work aims to estimate the spatial variability of the ETa in a relatively hilly vineyard. We carried out an unmanned aerial vehicle (UAV) and RGB/NIR camera fixed to collect images of the experimental vineyard at Cave Geisse and through the image processing software'sit was obtained the orthostatic of georeferenced photos, the digital surface model (DSM) and then the digital terrain model (DTM). Using QGIS software it was possible to implement the METRIC algorithm equations for the images collected by the UAV. The data are almost processed and it is showing that it will be possible to identify factors determining micro relief in the estimation of actual evapotranspiration and to allow precision water replacement by irrigation on vineyard. KEYWORDS: Vitis vinifera