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JUSTIFICATION OF QUALITY ESTIMATION METHOD OF CREATION OF DIGITAL ELEVATION MODELS ACCORDING TO THE DATA OF AIRBORNE LASER SCANNING WHEN DESIGNING THE MOTOR WAYS

Abstract

The method of creation of digital elevation models according to the data of the airborne laser scanning was considered. The dependencies of the density of the laser points from the angles of relief slopes were determined, which represent the plain relief with the angles of slope up to 2°; hilly relief with the angles of slope up to 4°; high relief with the angles of slope up to 6°; mountain and piedmont relief with the angles of slope up to 6°. The minimal number of the laser points necessary for the creation of digital elevation models was revealed for a distinct specific relief. The relief modeling of geophysical well logging along the designed motor ways was performed in the work. The relief modeling was performed in two stages: the first stage of modeling is a creation of a digital model of relief that includes all points belonging to the ground surface. This digital elevation model was accepted conventionally as “ideal model”. It was compared with the digital elevation models with the less density of cloud of laser points (CLP). The second stage of the modeling is a creation of a digital elevation model according to the points obtained taking into account the rated error of the laser scanner (m=0.1 m). The areas were determined for the estimation of the data quality of the airborne laser scanning: anthropogenic character of relief; the areas located on the relief of the biggest angles of scope such as hilly relief with the angles of slope up to 4° and high relief with the angles of slope up to 6°. The estimation of the quality of the digital elevation models built according to the data of the airborne laser scanning was performed.

ALINA ALEKSANDROVNA KOCHNEVA AND ALEKSANDR IGOREVICH KAZANTSEV

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