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Close-range photogrammetry is an image-based technique which has often been used for the 3D documentation of heritage objects.Recently, advances in the field of image processing and UAVs (Unmanned Aerial Vehicles) have resulted in a renewed interest inthis technique. However, commercially ready-to-use UAVs are often equipped with smaller sensors in order to minimize payload andthe quality of the documentation is still an issue. In this research, two commercial UAVs (the Sensefly Albris and DJI Phantom 3Professional) were setup to record the 19<sup>th</sup> century St-Pierre-le-Jeune church in Strasbourg, France. Several software solutions(commercial and open source) were used to compare both UAVs’ images in terms of calibration, accuracy of external orientation, aswell as dense matching. Results show some instability in regards to the calibration of Phantom 3, while the Albris had issuesregarding its aerotriangulation results. Despite these shortcomings, both UAVs succeeded in producing dense point clouds of up to afew centimeters in accuracy, which is largely sufficient for the purposes of a city 3D GIS (Geographical Information System). Theacquisition of close range images using UAVs also provides greater LoD flexibility in processing. These advantages over othermethods such as the TLS (Terrestrial Laser Scanning) or terrestrial close range photogrammetry can be exploited in order for thesetechniques to complement each other

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

CLOSE RANGE UAV ACCURATE RECORDING AND MODELING OF ST-PIERRE-LE-JEUNE NEO-ROMANESQUE CHURCH IN STRASBOURG (FRANCE)