Two new videos from the DARPA Subterranean Challenge reveal underground spaces—as charted by robots
CSIRO Data61 / YouTube / ScreenshotLast week, the team that took second place in a DARPA competition called the Subterranean Challenge released two videos recorded from runs last year through the Louisville Mega Cavern. These videos, recorded as part of the competition to find, identify, and map underground spaces, offer a glimpse into the world of machine-generated mapping of three-dimensional spaces.
For the final challenge, robots had to navigate environments stimulating tunnels, natural caves, and built underground urban environments. As DARPA, the “Challenge seeks novel approaches to rapidly map, navigate, and search underground environments during time-sensitive combat operations or disaster response scenarios.”
Robots see in lasers and light, and sometimes employ other sensors like radar, too. To make this information useful to human observers, a robot must then convert the numbers from that data back into something visual, rendering a map and a model of its immediate surroundings. In the SLAM fly-through, data from four different robots is stitched together into one coherent whole. Rooms, hallways, and obstacles are all revealed through a pointillist pattern of laser scans, through lidar mounted on the robots. It feels like an archeological excavation, which is a common use for lidar technology.a more realistically colored map presentation can be built on top of the existing lidar point clouds.
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