Vertical accuracy assessment of DSM from TerraSAR-X and DTM from aerial photogrammetry on paddy fields - Karawang, Indonesia

Abstract

A Digital Terrain Model (DTM) is a digital model representing the earth 's surface topography in three dimensions (3D) while a Digital Surface Model (DSM) represents the whole terrain including the objects on it such as trees and buildings. DTMs can be created through stereo-plotting. The advantage of this method is that the 3D data can be obtained with a high level of accuracy, but the data is limited in cloudy areas. This problem can be solved by using DSM, which can be created using TerraSAR-X and TanDEM-X Satellites with Synthetic Aperture Radar (SAR) system. This research aims to analyze the accuracy of DSMs from TerraSAR-X alongside DTMs extracted from aerial photogrammetry. The accuracy assessment of vertical height was completed by choosing 121 check points spread systematically on a paddy field in Karawang Regency, West Java. As paddy field was chosen to minimize errors between the DSM and DTM. The average, minimum, and maximum value of height differences between the DSM and DTM was calculated to obtain the standard deviation. The result showed that the average height difference between the DSM and DTM was 3.4 m with a minimum and maximum difference as 0.2 m and 10.808 m respectively. The standard deviation obtained was 4.9 m.