Evaluation of the operation of a semiautomatic road network capture process

Within the framework of the French topographic database production, IGN2 is working on problems related to the photogrammetric data capture automation. After a general presentation of the method we use for road extraction, this paper presents the use of this method within a semi-automatic approach, not very ambitious in terms of automation level but looking for a short term efficiency. A prototype has been implemented, taking into account the operational constraints, and a large part of the paper is dedicated to the evaluation of this method, evaluation in terms of geometric quality of the result and of data capture time compared with a manual data capture.