Mar 25 2020
10:30 am - 11:30 am
Advanced Sensor Topics
Track Names: ADVANCED SENSOR TOPICS, Wednesday 10:30 - 11:30
Session Date: Mar 25 2020 10:30 am - 11:30 am
High Performance Unmanned Aerial Vehicle LiDAR
10:30 AM - 10:45 AM
Motivation: In precision agriculture LiDAR data is a key sensing modality providing valuable insight into crop yields and overall health. The large scale of tree nut groves, citrus groves and forestry operations combined with the requirement to provide timely information to customers makes an airborne LiDAR the most economical solution. Problem statement: Widespread adoption of LiDAR is hindered by the high cost of the LiDAR and INS/GPS systems currently available. In addition, current systems are primarily intended for mapping rather than a foliage penetrating (FOPEN) LiDAR optimized for imaging beneath dense canopies. FOPEN LiDAR allows measurement of tree topology, crop yield estimation while also imaging the surrounding topography. Collecting this data would be time consuming and prohibitively expensive without the use of LiDAR. Approach: A compact airborne LiDAR based on lessons learned during the DARPA Jigsaw FOPEN Lidar program has been designed. Development is based on a phased approach using function over form Engineering Demonstration Units (EDUs) to rapidly test various system configurations. Results: A LiDAR with 1x16 detector array, 100kHz laser and dual wedge prism scanner has been developed. Phase I is complete with an EDU operating at 1.6MSs. The Phase II flight EDU is nearing completion and will fly in the 4th quarter of 2019. A Phase III prototype with 1x128 array operating at ≥12.8MSs will be competed in 2020. Conclusions: Airborne LiDAR systems designed for mapping applications are not well suited to precision agriculture due to their limited FOPEN capability and high cost. A cost effective LiDAR design optimized for FOPEN capable of being deployed on small drones allows widespread use of LiDAR in precision agriculture and forestry.
Unique Scanning Scheme for High-Precision UAV LiDAR Acquisition
10:45 AM - 11:00 AM
In the last few years, LIDAR acquisition from medium-scaled unmanned aerial vehicles has found growing fields of applications by providing dense point clouds with high precision and impressive accuracy. Such employed LIDAR instruments have evolved significantly with respect to measurement speed and thus acquisition efficiency. Recent examples include LIDAR instruments with up to 1.5 million laser pulses per second on the ground, perfectly suited for operation from fast-flying fixed-wing platforms. However, it is not only the achievable point density on the ground that counts, but also the diversity of angles of incidence of the measurement beams with respect to the targets. Especially in corridor mapping with a single flight line over e.g. a power line, the acquisition of data on vertical structures like pylons is essential. We discuss a scanning scheme novel to UAV-based laser scanning which is especially suited for corridor mapping from UAV platforms. We illustrate the achievable distribution of the measurements on the ground for typical scenarios with emphasis on the distribution of the angles of incidence of the measurement beams on the objects providing an enhanced completeness of data acquired.
RIEGL Laser Measurement Systems GmbH
Q&A and panel discussions with session presenters
There will be a 15 minute Q&A /panel discussion with the presenters of the Advanced Sensor Topics session.