DETERMINATION OF CORRESPONDING TRUNKS IN A PAIR OF TERRESTRIAL IMAGES AND AIRBORNE LASER SCANNER DATA

摘要

A method based on extracted trunks is proposed for automatic determination of corresponding trees between a georeferenced pair of terrestrial images and airborne laser scanner data in a wooded area. Trunks in the terrestrial images are obtained by region growing segmentation between left and right edges of trunks detected within a region of interest. Trunks in a digital tree height model generated from the laser scanner data are estimated as straight vertical lines through the weighted centers of canopy points of single trees. Corresponding trunks in the left and right images are found with the help of trunks in the laser scanner data and additional attributive information. A piece of 3-D line reconstructed from the trunks in the images verifies the corresponding trunk in the laser scanner data. An experiment illustrates the performance of the method. Potential applications include augmenting a 3-D forest model derived from laser scanner data with complementary information from terrestrial images.