Avaliação da qualidade de produtos obtidos por RPAS tipo asa fixa e processado em software livre e comercial

Abstract

Currently, as remote sensing techniques used with unmanned space aircraft or RPAS (Remotely Piloted Aircraft System) in particular as for civil use combined with low cost non-metric sensors, it has mapping solutions with high resolution and temporal, having great potential in areas such as precision agriculture, environmental monitoring, civil construction, mining, among others. Despite the low costs in relation to an aerial survey using a manned aircraft or acquisition of an orbital image with spatial resolution, the data processing obtained by RPAS is also performed in commercial software. The present work used data from a municipal aerial survey carried out in 2017 in the Goiano de Santo Antônio, in which an RPAS fixed wing E-Bee was used. The objective of this work was to evaluate the use of free or open source software for data processing. A quality analysis was performed between Pix4d, Metashape PhotoScan and Web ODM software in a total of nine processings, three in each software, and subdivided into three scenarios. The first scenario without the use of control points, the second scenario using five control points and the third scenario with eight control points. Subsequently, the results of the collections were submitted to a normality test, in which no normality was obtained in all samples, thus opting for a quality analysis using descriptive statistics and the PEC-PCD to arrive at a sub-meter. - Products without PC scenarios without control points of all software showed similar quality results at 1:5000 scale, in scenarios that used five or eight control points there is no visible quality gain compared to scenarios without points of control; Web ODM and Metashape PhotoScan software showed similar results with scenarios, with PEC-PCD class A planimetric orthomosaics at 1:5000 scale, while Pix4d software presented the best result in both scenarios with class A orthomosaics at scale of 1 :1000. The orthomosaic ODM product is generated by the free Web distribution software, is similar in quality to commercial Metashape PhotoS software, and has potential for professional use.