VALIDATING TECHNOLOGY BASED ON BATHYMETRIC SURVEY IN THE INTERTIDAL ZONE OF GIPUZKOA

Abstract

ABSTRACT: This project’s goal was to carry out an Airborne LIDAR Hidrographic (ALH) survey of the intertidal zone of the Gipuzkoan coast, in order to cover the supralittoral and infralittoral zones to a depth of at least 8 m. under the astronomical low water mark. In turn, it would provide continuity to the existing bathymetric and altimetric models. In the coastal strip there were data for the land area obtained with Terrestrial Laser Scanner (TLS) or Airborne Laser Scanning (ALS), and there was also a bathymetric survey of the coastal platform carried out through a MultiBeam Echosounder (MBES). Given the difficulties of surveying in the coastline, the works were set so that the ALS survey was carried out during the low tide and the MBES survey was done during the high tide, thus reducing the safety margin under the keel to the minimum. Both surveys were provided as control elements for the ALH to study the accuracy and reliability of ALH data, since they were obtained with verified technologies which can be just as accurate, if not more so. Although the first studies were carried out solely in the water area through the comparison of the data gathered by ALH and MBES, it soon became clear that a higher number of clearly defined elements was necessary. Therefore, the land study was added to the data collected through ALS technology. The ALH technology has proven to be the best solution for obtaining coastline cartography, in addition to being the most efficient as well as the safest. Keywords: LIDAR (LIgh Detection And Ranging), ALB (Airborne LIDAR Batymetry), ALH (Airborne LIDAR Hidrographic), ALS(Airborne Laser Scaninning),MBES (Multi Beam Echosounders ), MDS (Digital Surface Model), MDT (Digital Terrain Model), TVU (Total Vertical Uncertainty), IHO (International Hydrographic Organization)