New Approach in Integrated Basin Modelling: Melen Airborne LIDAR

Abstract

Airborne LIDAR technology which has an increasing importance in recent years, has entered into the field of application of many disciplines by obtaining fast and highly accurate 3D data. It provides precise topography information with dense point cloud data as well as all details on the surface. Thus, it has become useful in all disciplines associated with space such as cartography, construction, city planning, forest, energy, hydrology, geology, transportation, telecommunications, security, disaster, aviation, and infrastructure. By mounting LIDAR measurement units on aircraft large areas can be measured relatively quickly and cost-effectively. In this study, Riegl Q680i scanner and CCNS5 flight management system were mounted to the aircraft. The digital elevation models; DEM (Digital Elevation Model) and DSM (Digital Surface Model) of the Melen basin, which is located within the boundaries of Düzce and Sakarya was generated using LIDAR point cloud data (.las format) with a point density of 16 points/m2 and also 1/1000 base maps of the basin were produced. In addition, many details such as road, slope, culvert, electricity poles were drawn in accordance with the principles of large-scale map construction regulations and transferred to GIS environment. The Melen basin with an important water storage area, boundaries, basin model, water collection lines, determination of flow directions and connections, the topographic surface of the basin sub-areas, morphology were created using 3D laser point cloud data. So, the digital terrain model of the basin in GIS environment is visualized with linear maps. LIDAR data provides 3D geometric and morphological information that cannot be obtained according to classical methods in this kind of engineering studies. Results suggest that the higher spatial resolution LIDAR-derived data are preferable and can introduce more detailed information about basin hydro geomorphic behaviours.

An Empirical Investigation on Hydro-Morphological Process of Surma River: Substantiation from North-East Zone of Bangladesh

“…The Sylhet basin, which is a low-lying subsiding area attracts the rivers from both east and west sides. Even the Surma and Kushiyara rivers are found to be shifted westward to feed the deepest basin area (BHWDB, 2012;Gazioğlu, 2018;Büyüksalih & Gazioğlu, 2019). Sediment concentration and its distribution are also responsible for shaping the morphology of the area.…”

Extraction of Roof Planes from Different Point Clouds Using RANSAC Algorithm

“…In the recent past, the interest in accurate and detailed 3D building data acquired by airborne LIDAR systems has been growing. Building Information Modelling (BIM), snow load capacity estimating and modelling and solar potential analysis can be given as examples of application areas for building detection (Jochem et al, 2009;Büyüksalih and Gazioğlu, 2019). Today, solar energy can be produced on the rooftops of private houses as easily as in energy companies after detecting proper building roofs.…”

Positioning Structural Height Restrictions: An Implication from Geo Observation Data around a Proposed Airport, Ido-Osun, Southwestern Nigeria

“…International Journal of Environment and Geoinformatics 7(2):120-126 (2020) Reaserch Article How to cite: Rafiu., et al, (2020) According Nigerian national Building Code of 2006, building height shall mean the vertical distance from grade to the top of the highest roof beams or coping of a flat roof, or to the average height of the highest gable of a pitched or hipped roof. The height of a stepped or terraced building is the maximum height of any segment of the building (Aydar, et al, 2016;Büyüksalih, et al, 2019;Büyüksalih and Gazioğlu, 2019). Considering the inherent problem with this, it is high time, the use of spatial data and visualisation technique are being deployed in setting building height limits around the airports.…”