INTERSEÇÃO FOTOGRAMÉTRICA EM UM BANCO DE IMAGENS GEORREFERENCIADAS

Abstract

Mobile mapping systems (MMS) provide a sequence of image pairs that allow the measurement and analysis of photogrammetric point and features for topographic mapping purposes and also for a visual evaluation of some specific conditions of the roads. A project of MMS generates a large number of images that are stored in magnetic tapes (DVCAM) at 30 fps (frames per second) in the camera and then downloaded to a computer hard disk. Even selecting only one image per second, the number of images related to the traveled roads is still expressive. A georeferenced road image pair database was built in order to store and manage image data obtained by the MMS. A module of photogrammetric intersection was added to the database in order to measure the image pairs and to compute the spatial coordinates of the selected points of the roads and their vicinities. The results obtained from different methods of intersection are presented and discussed including an urban road map at scale 1:2000. As expected, the rigorous model of the collinearity equations provided the best results after using the estimates of the photogrammetric intersection by parameter grouping as approximate values for the three cartesian coordinates of the object points.

Keywords

• Mobile Mapping Systems
• Photogrammetric Intersection
• Image Database