用无人机看世界
A drone moves high above downtown Reno, Nevada, on the afternoon of June 23, 2019 as part of NASA’s TCL-4 (Technology Capability Level) operation. TCL-4 involves flight testing multiple UAS (Unmanned Aerial Systems) in higher-density urban areas for tasks such as newsgathering, package delivery and large-scale contingency mitigation. The next and final test ...