Avaliação da qualidade das medições fotogramétricas da versão integrada do software livre E-FOTO.

Abstract

The acronym E-FOTO stands for an Educational Digital Photogrammetric Workstation. This is a multidisciplinary research project developed in The Rio de Janeiro State University. The E-FOTO project has two pillars: self-learning and gratuity. This dissertation evaluates the quality of the photogrammetric measurements performed by the 1.0β integrated version of the E-FOTO software. Two photogrammetric blocks of airborne imagery taken in different geographic areas were used accordingly: the former photogrammetric dataset is assembled from 12 photograms of the city of Seropédica-RJ, flown in 2005; the second photogrammetric block is a set formed from 6 very old photograms taken in 1953 over the region of Compostela, in Spain. The photogrammetric measurements taken in the E-FOTO were compared with those taken using the Leica Photogrammetry Suite (LPS 2010) commercial software. The ground truth is a set of 30 ground testing points (GCP) measured with a geodetic, dual frequency receiver of the Global Navigation Satellite System (GNSS/GPS) system. A digital photogrammetric mapping procedure was used to evaluate the E-FOTO software. For doing so, both interior and exterior orientation parameters of every image were computed. The photogrammetric computation of object-space coordinates of testing points was performed in the 1.64 version of the stereo plotter module of the E-FOTO. The comparisons of the results of the E-FOTO measurements with those taken from the LPS software can be considered identical, at the confidence level of 95%. The photogrammetric measurements performed in the 1.64 version of the E-FOTO stereoplotter module also match the tridimensional UTM coordinates (E, N and H) of the ground testing points at the same confidence level of 95%.