“The trick is tracking their movements under the ice.
In tournaments, it’s not enough to land on a school and catch a couple, Wilson says. The curtain’s been peeled back, and there’s no turning back.” “Now, we can go out there on any winter day, drill a few holes, do a couple scans with Panoptix, and always find fish. “There’s a lake I’ve fished a lot over the years where once every few winters, you might get lucky and land on a couple crappies out in the basin,” says Ryan Wilson, who won the 2019 NAIFC (North American Ice Fishing Circuit) National Championship alongside partner Brandon Newby. The sequential correction, mapping, and analysis steps are demonstrated using a data set from a shallow freshwater environment.Proof of the power of live-scanning under ice has emerged on the North American Ice Fishing Circuit (NAIFC), where three elite teams have dominated on difficult panfish water. These methods are encoded in an open-source and freely-available software package, which should further facilitate use of recreational-grade sidescan sonar, in a fully automated and objective manner. Procedures are described for automated removal of the acoustic shadows, identification of bed-water interface for situations when the water is too turbid or turbulent for reliable depth echosounding, and for automated bed substrate classification based on singlebeam full-waveform analysis. To promote an ongoing ‘democratization’ of acoustical imaging of shallow water environments, methods to carry out geometric and radiometric correction and georectification of sonar echograms are presented, based on simplified models for sonar-target geometry and acoustic backscattering and attenuation in shallow water. In recent years, lightweight, inexpensive, vessel-mounted ‘recreational grade’ sonar systems have rapidly grown in popularity among aquatic scientists, for swath imaging of benthic substrates.
0 kommentar(er)
