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In this technical report, we propose a new method to extract tree data form airborne laser scanner data by bilateral filter. We prove the effectiveness of the proposed method through experiments which used airborne laser scanner data of river area. Finally, we comment on the respects in which the proposed method is improved and on future prospects.

In this technical report, we propose a new clustering method based on histogram intersection. We prove the effectiveness the proposed method through experiments of land cover classification with multispectral image. Finally, we comment on the respects in which the proposed method is improved and on future prospects.

There are several kinds of laser scanners available for two-dimensional and three-dimensional measurement of object shapes, and there are some methods for setting the measurement devices in those laser scanners. Among those methods, calibration techniques are important for their practical use. I propose, in this technical report, some calibration methods of a laser scanner by measuring a target object with simple geometric shapes without using special machineries.

In recent years, plane type and ground type laser scanners have become to be widely used for constructing three-dimensional terrain data. However, when occlusion is occurred and lasers are not fully returned, lost of data happens and measurement noises contaminate terrain data. Terrain data are commonly represented with DEM (Digital Elevation Model) or TIN (Triangulated Irregular Network) . We propose, in this letter, an interpolation method for filling in lost DEM data. Through the experiments using sample data of lost DEM, we demonstrate the effectiveness of our interpolation method.