![]() When the ring was not tensioned into a circular shape, the non-floating ropes sank and got entangled in rocks in the shallows, hampering movement of the target. Due to the flexibility of the HDPE pipe used, the ring took an elongated shape during towing in the water, which tended to transition back into a circle after the towing stopped. The test deployment was performed in order to assess a series of parameters such as maneuverability inside and outside of the water, buoyancy, shape retention, robustness. ![]() Four lines of rope spanning the diameter of the ring were used in an effort to restrain the ring from taking an elliptical shape. In addition to the 12 targets, a large 28 m diameter circular target with a single row of HDPE mesh was deployed. UAV multispectral, thermal and optical data were successfully acquired. During satellite acquisition a cloud formation overshadowed the deployment site and as a result no useable satellite data were acquired. The sky was partly cloudy throughout the morning. Wind and wave conditions were good, with wind speeds in the range of blah and low waves. ![]() All 12 anchors and targets were deployed successfully. The fifth experiment day went on as planned. Our fifth test deployment day with marine litter. Additionally, UAV optical and hyperspectral data were acquired using the DJI Phantom 4 Pro and S1000 drones. PRISMA and WV II satellite data were acquired. The sea state was calm, with winds not exceeding 2 Bf. High humidity and aerosol concentrations however could have produced signal interference. Weather conditions were optimal, some clouds during the early morning which had cleared up completely before data acquisition. All 12 targets and anchors were deployed as planned. The sixth experiment day was conducted successfully. Our sixth and last test deployment day with marine litter. During the second PLP (PLP2019), 10 smaller targets were created in order to be closer to reality and to examine the limitations of the detection with Sentinel-2 images. Three large artificial 10×10 m plastic targets were designed and constructed, matching the Sentinel-2 RGB and NIR bands spatial resolution. Please redirect to our new dedicated webpage: first PLP was conducted in 2018 (PLP2018) as an innovative exploratory application of open-access satellite imagery and unmanned aerial systems (UAS) data for the remote detection of floating marine plastics in natural waters. ![]() In PLP2020 we work towards creating a reference target for the scientific community, and extending deployment duration in real conditions with the construction of semi-permanent targets. Plastic Litter Project (PLP) has a new dedicated site. ![]()
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