Valutazione dell'accuratezza di prodotti fotogrammetrici di alta risoluzione spaziale ottenuti con tecniche SfM da rilievi con autogyro

This work is part of a larger project that aims to develop an autogyro equipped for multiparametric surveys, called “RadGyro” due to the peculiar initial characteristic of natural radioactivity detection. In this work, the aircraft has been used to acquire photogrammetric data of the Rocchetta Caldia and Piastrone marble quarries in the Apuan Alps (Massa municipality). In morphologically complex areas, such as the extraction sites in mountainous zones, it is generally difficult to obtain high positional accuracies of the photogrammetric products. This problem can be partially overcome by exploiting the RadGyro agility and possibility to fly at low altitude and processing the data trough Structure from Motion algorithms. In order to assess the positional accuracy of the products, we present the results obtained varying the number of Control Points in respect to that of Check Points resulting from topographic surveys executed by means of GPS and Total Station.