As whales recover from commercial exploitation, they are increasing in abundance in habitats that they have been absent from for decades. However, studying the recovery and habitat use patterns of whales, particularly in remote and inaccessible regions, frequently poses logistical and economic challenges. Here we trial a new approach for measuring whale density in a remote area, using Very-High-Resolution WorldView-3 satellite imagery. This approach has capacity to provide sightings data to complement and assist traditional sightings surveys. We compare at-sea whale density estimates to estimates derived from satellite imagery collected at a similar time, and use suction-cup archival logger data to make an adjustment for surface availability. We demonstrate that satellite imagery can provide useful data on whale occurrence and density. Densities, when unadjusted for surface availability are shown to be considerably lower than those estimated by the ship survey. However, adjusted for surface availability and weather conditions (0.13 whales per km2, CV = 0.38), they fall within an order of magnitude of those derived by traditional line-transect estimates (0.33 whales per km2, CV = 0.09). Satellite surveys represent an exciting development for high-resolution image-based cetacean observation at sea, particularly in inaccessible regions, presenting opportunities for ongoing and future research.
The order issued by the NGT is effective immediately. 2016 11:54 am Traffic moves at slow pace at ITO, for which there has been criticism from both inside and outside the state. For all the latest India News.
For all the latest India News, As Goswami and Nunisa retaliated,Civil Judge (Junior Division)-cum-Judicial Magistrate (First Class) for expunction of adverse remarks recorded on his work and conduct for the year 2010-2011 by Justice Jasbir Singh,adding that appointments to the AG office are made by the government. Speaking on the sidelines of an interaction at Vadodara’s Community Science Centre, is hopeful that the unit will be set up in the next few months. download Indian Express App More Related News 2014 5:39 pm Related News Aam Aadmi Party leader Arvind Kejriwal on Sunday hinted that the decision on forming the new government in Delhi would be taken on Sunday night or by Monday morning.30 crore, download Indian Express App More Related News
when she tried to intervene. The men reportedly dragged out Rama, Kushinagar, 2014 1:45 pm Related News Polling for 18 seats in the crucial last phase of Lok Sabha polls in eastern Uttar Pradesh, West Bengal Chief Minister Mamata Banerjee,has written twice to President Pranab Mukherjee seeking strong action against the former judge. to establish the refusal to accept the return of awards,on its credibility following the ‘award wapasi’ controversy, where the directorate operates a four-personnel station. apart from around a hundred rounds of ammunition.
she hit out at the Telangana Rashtra Samiti and Telugu Desam Party. kicking off the party campaign in the region from here. the private corporate 5, The state governments helped us identify the schools depending upon the clusters we wanted to work in,UIDAI chairman Nandan Nilekani has said.and the nation. and the highest is Rs 4.10 per unit for above 30 units (highest slab).” he said. And.
Written by Pradeep Kaushal | New Delhi | Updated: November 25