Airborne Laser Scanning Data for Tree Characteristics Detection

Vazirabad, Y. F.
Karslıoğlu, Mahmut Onur
Airborne laser scanning (ALS) technology provides a distinctive, innovative, accurate and cost effective approach to forest inventory. ALS data is used for information extraction with respect to the detection of tree characteristics like height, diameter at breast height (dbh) and crown diameter. Also, timber volume and biomass can be estimated from this information. Forest studies and applications aim to achieve the operational fast methods and reliable results. It is possible if the data contain dense point clouds. The first step to generate high resolution canopy height model (CHM) is to normalize digital surface model (DSM) by subtracting DTM from DSM. Thus, CHM contains the same X, Y coordinates as DTM and tree height as Z value. CHM accuracy is mostly affected by the accuracy of DTM and DSM. The interpolation method in high density point does not cause considerable error while corresponding filtering methods have the most effect. Recent studies show that, moderate to dense forest, estimations tend to underestimate tree height. In this work a technique based on the searching of local maximum canopy height is used to detect individual tree with variable window size and shape. The performance of this technique for the detection of the tree height is more than 90 %.


Wavelet-Based Outlier Detection of Airborne Laser Scanning Data
Akyay, Tolga; Karslıoğlu, Mahmut Onur (2009-06-13)
The method of airborne laser scanning - also named as ALS - has recently turned out to be an efficient way for generating high quality digital surface and elevation models. In this work, wavelet-based outlier detection of airborne laser scanning data is discussed. The task is to investigate the effect of wavelet-based outlier detection for post-processing. Data and results are analyzed and visualized by using a MATLAB program which was developed during this work.
Development of a pulsed fiber laser for ladar system
Dülgergil, Ebru; Altan, Hakan; Department of Physics (2012)
In recent years laser technology has increasingly developed with the use of fiber lasers and this has provided the possibility to implement different techniques in the defense industry. LADAR is at the forefront of these techniques. Fiber lasers constitute a perfect source for LADAR systems due to their excellent robustness, compact size and high-power generation capability. In this study we will explore the development of a pulsed fiber laser source for a LADAR system that can obtain high resolution 3D ima...
Airborne laser scanning data for snow covered biomass estimation
Vazirabad, Yashar Fallah; Karslıoğlu, Mahmut Onur (SPIE-Intl Soc Optical Eng, 2009-04-13)
Airborne laser scanning provides reliable terrain data in terms of 3D coordinates. High resolutions Digital Terrain Models (DTM) are in use for many applications, including change detection of surfaces. Also the estimation of the snow depth by making use of Airborne Laser Scanning (ALS) data acquired in summer and winter is a subject of current investigations. However estimating snow depth seems problematic in vegetation covered areas. This work focuses on the investigation of the snow depth estimation usin...
Cerit, Kübra; Bek, Alpan; Department of Physics (2022-1-20)
In this thesis, optical system design, integration and testing of a compact LIDAR system with 270 degree field-of-view that based on time of flight principle is developed by Rekrom Optoelectronics. This system can identify objects and measure distances up to 100 m away. LIDAR has become a much needed and used technology in various fields. The most important of these areas are robotic systems, autonomous vehicles and unmanned aerial, land and sea platforms navigation and environmental awareness. The main r...
A Graph Signal Filtering Based Approach for Detection of Different Edge Typeson Airborne LiDAR Data
Bayram, Eda; Vural, Elif; Alatan, Abdullah Aydın (2017-09-12)
Airborne Laser Scanning is a well-known remote sensing technology, which provides a dense and highly accurate, yet unorganized point cloud of earth surface. During the last decade, extracting information from the data generated by airborne LiDAR systems has been addressed by many studies in geo-spatial analysis and urban monitoring applications. However, the processing of LiDAR point clouds is challenging due to their irregular structure and 3D geometry. In this study, we propose a novel framework for the d...
Citation Formats
Y. F. Vazirabad and M. O. Karslıoğlu, “Airborne Laser Scanning Data for Tree Characteristics Detection,” 2010, Accessed: 00, 2020. [Online]. Available: