QUALITY ASSESSMENT OF DIGITAL TERRAIN MODEL DERIVED FROM LIDAR

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-12-4 / ISSN 1314-2704, June 19-25, 2014, Book 2, Vol. 3, 793-798 pp

ABSTRACT
The paper aimed to present the main issues related to the altimetric quality evaluation of the Digital Terrain Model (DTM) derived from airborne laser scanning. The DTM data was stored in a TIN (Triangulated Irregular Network) data model. The DTM quality assessment was made based on a reference dataset that contains points colected in the field using geodetic methods. The reference data fairly evenly covers the tested area. The quality evaluation was based on the quality element, principle and procedures mentioned by ISO/DIS 19157 (Geographic Information-Data quality) standard. In altimetric accuracy assessment, it was used the gridded data positional accuracy [5], in a sense that the closeness [5] was calculate as the difference between the interpolated value from TIN surface and values accepted as being true from the reference dataset.

Keywords: quality control, chi-square, DTM, TIN, LiDAR