3d Monocular Restitution Applied to Small Format Digital Airphoto and Laser Scanner Data

The utilization of the low cost digital small format camera for the obtainment of space information of the terrestrial surface tends to increase in the current days. This is due to the increase of the resolution, low cost and good geometric stability for mathematical parameters that define the interior geometry. The data set point, with height surface information, derived from the laser scanner, has improved the accuracy. Also, the development of this new technique has improved the existent methods applied to obtainment of the space information for several engineering applications. The development of new photogrammetric procedures applied to obtainment of information of the terrestrial surface that present facility, less qualified operational dependence and low cost in the productive process, is being more and more requested in the current. This paper shows the development of the methodology used and the results obtained from 3D photogrammetric vector mapping using the monocular restitution; digital aerial images obtained from low cost small format camera and data set height points deriving from laser scanner system. The digital aerial images were provided by an aerial survey performed with digital small format Sony camera, model DSC-F717, resolution of 5.2 Mbytes, CCD dimension of the 2560 x 1920 “pixel”. The air survey was performed in an approximate height flight of the 750 meters. The pixel resolution in terrain is approximately 25 centimeters. The height data set points were derived from laser scanner air survey with 1000,00 meters of the height flight. The resolution of the pixel size in terrain is approximately 50 centimeters. The System used is OPTECH/INS GPS APPLANIX, property of the Technology Institute for the Development – LACTEC – UFPR. This paper presents the height interpolation procedures and mathematical algorithms and techniques development used for both with and without height features extraction. The procedures were implemented in the computational program (Digital Monoplotting) and it was developed in the Graduation Program Course in Geodesic Sciences in the UFPR. Control points were used to determinate the exterior orientation of the images and the compatibility of the height data set points. The three-dimensional coordinates of points of the entities were compared. The points were derived from the vector mapping produced by 3D monocular restitution and the conventional 3D stereo restitution performed in the Zeiss Planicomp with conventional metric photos (camera WILD RC-10 and scale of 1/6000). The paper presents the results performed in the comparisons.