A Structure from Motion Perspective of the Small-Scale Array

jrosmanBathymetry Survey, GPS Marking

Left: Ortho mosaic of the instrumented rock at Asilomar, obtained by stitching GoPro photos. Right: multibeam bathymetry with instrument positions indicated by black dots. Magenta lines are across-shore and along-shore transects along which instruments were placed. On the last day deploying instruments in the small-scale array, visibility was amazing and we could  even see the instruments from the surface. Loren … Read More

novel coherent alongshore array – decades in the making

jhmacmahUncategorized

Nearshore oceanographers have long been interested in edge waves that are ubiquitously found on sandy shores; from Huntley, Guza, Thornton (Torrey Pines, early 80s) to Oltman-Shay, Howd (Duck, early 90s) to Sheremet, Noyes, Guza, Feddersen, Elgar (Duck, late 90s) and MacMahan, Reniers (rip channeled beach in Monterey, early 2000s); amongst many others. Edge waves are low-frequency waves that are refractively … Read More

July 6th: UAS Bathymetric Survey of China Rock region

ffeddersenDrone

On Wed July 6th, a UAS survey of the low-tide bathymetry / topography of China Rock was completed.    A lawnmower pattern was flown at 50 m above the takeoff deck at a speed of 6 m/s.    The survey itself took about 13 min at low-tide.    Rob then processed the lidar data and colorized it with the camera images.  The result … Read More

UAS lidar and photo survey day at Asilomar

gregwilsonUncategorized

When flying our drone Asilomar State Park, we and the Parks rangers are often asked if we’re looking for sharks or other wildlife in the water for our research.  While the answer is generally “not-really” — our goal is to measure the waves and currents in the nearshore — we do in fact get beautiful views of the seabed and … Read More