Inside Unmanned Systems

APR-MAY 2018

Inside Unmanned Systems provides actionable business intelligence to decision-makers and influencers operating within the global UAS community. Features include analysis of key technologies, policy/regulatory developments and new product design.

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54 April/May 2018 unmanned systems inside AIR TRAINING W hen it comes to unmanned aircraft systems (UAS) for mapping and spe- cifically to the power and potential of LiDAR sensors, there's a lot of enthusiasm…but limited education. It's one reason ASPRS sponsored the Unmanned Airborne LiDAR for Precision Mapping workshop led by distinguished Mohamed Mostafa, chair of the ASPRS Precision Mapping by UAS Committee and director of the Microdrones mdSolutions Team. Mostafa explained, "It's important to ASPRS that we educate newcomers—from drone pilots to geo- spatial students—to the UAV space, particularly those who may not have survey backgrounds. By sharing knowledge about GNSS, photogrammetry, LiDAR, inertial navigation and geodesy, we can help them ask the right questions, invest in the most ap- propriate tools and derive the best results." Held after the ILMF/ASPRS Annual Conference in Denver, Colorado, in February, the workshop pro- vided a comprehensive overview of mapping con- cepts, tools, techniques and applications. For many of the 30+ attendees, it was an eye- opening experience and set the stage for greater interest and adoption. AIR-TO-GROUND BASICS The development and production of survey and en- gineering quality maps is not an easy conversation in today's high-tech world. That's one reason Mostafa provided a compre- hensive look at the key fundamentals necessary to deliver a final mapping product (e.g., DEM, DTM, TIN). He outlined current tools and techniques (e.g., airborne photogrammetry, satellite imagery and airborne LiDAR) to gather the data and pro- cess accurate results and further delved into the key georeferencing methods with an introduction to GNSS basics (e.g., radio frequencies, ranging concepts, positioning modes, error sources). Because the accuracy of the data is directly related to the positional accuracy of the drone as well as the LiDAR sensor, he went on to describe the value of an inertial measurement unit (IMU) as well as a GNSS- aided inertial navigation system (INS) to deliver GNSS-aided inertial navigation solutions—which packaged as a whole delivers one positional correc- tion to the entire dataset during post-processing. He also outlined today's readily available refer- ence stations, earth observation networks, online positioning user services (OPUS), Canadian Spatial Photo courtesy of Microdrones. ASPRS Hosts Educational Mapping & Georeferencing Workshop. by Vicki Speed a Geo- Odyssey of UAS LiDAR Mapping The ASPRS seminar addressed drone mapping fundamentals including LiDAR sensors and georeferencing. asprs review

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