Results 11 to 20 of about 179,801 (303)

Aerial surveys of waterbirds in Australia. [PDF]

Sci Data, 2020
AbstractTracking long-term environmental change is important, particularly for freshwater ecosystems, often with high rates of decline. Waterbirds are key indicators of freshwater ecosystem change, with groups reflecting food availability (e.g. piscivores and fish).
Kingsford RT, Porter JL, Brandis KJ, Ryall S.   +3 more
europepmc   +5 more sources

REPORT ON THE MAP OF WEST ONGUL ISLAND

Antarctic Record, 1965
0ne sheet map of West Ongul Island, separated by a narrow strait from East Ongul Island in which Syowa Station is situated, was compiled with 1 : 5,000 scale.
Arao YOSHIDA, Yoshio SAITO
doaj   +1 more source

Repurposing open‐source data from weather radars to reduce the costs of aerial waterbird surveys

Ecological Solutions and Evidence, 2022
Aerial counts are the primary means of monitoring waterbird populations. A valid population assessment requires a significant proportion of the population to be surveyed.
Rebecca M. Rogers, Jeffrey Buler, Timothy Clancy, Hamish Campbell   +3 more
doaj   +1 more source

Reduction of Species Identification Errors in Surveys of Marine Wildlife Abundance Utilising Unoccupied Aerial Vehicles (UAVs)

Remote Sensing, 2022
The advent of unoccupied aerial vehicles (UAVs) has enhanced our capacity to survey wildlife abundance, yet new protocols are still required for collecting, processing, and analysing image-type observations.
Eyal Bigal, Ori Galili, Itai van Rijn, Massimiliano Rosso, Christophe Cleguer, Amanda Hodgson, Aviad Scheinin, Dan Tchernov   +7 more
doaj   +1 more source

Monitoring trends in sea turtle populations: walk or fly?

Endangered Species Research, 2017
Monitoring animal populations is essential to conservation, and complex monitoring goals require complex resources. Variable detection probabilities can create uncertainty in trends and abundances estimated from point count surveys (e.g. nest counts), as
Warden, ML, Haas, HL, Richards, PM, Rose, KA, Hatch, JM   +4 more
doaj   +1 more source

Aerial Drone Survey

International Journal of Advanced Research in Science, Communication and Technology, 2022
The use of unmanned aerial vehicles (UAVs) is growing rapidly across many civil application domains including real-time monitoring, providing wireless coverage, remote sensing, search and rescue, delivery of goods, security and surveillance, precision agriculture, and civil infrastructure inspection.
null Reshma K R, null Asif Shameer, null Dharsan K   +2 more
openaire   +1 more source

Advantages of Gamma-Radiometric and Spectrometric Low-Altitude Geophysical Surveys by Unmanned Aerial Systems with Small Scintillation Detectors

Applied Sciences, 2021
Unmanned aerial systems (UAS) for airborne gamma-ray surveys in radioecological and geological research are being increasingly used, since they provide radiation safety for personnel and high survey performance. Improvement of detection modules is one of
Alexander Parshin, Vladimir Morozov, Nikita Snegirev, Evgeniya Valkova, Fedor Shikalenko   +4 more
doaj   +1 more source

Aerial surveys adjusted by ground surveys to estimate area occupied by black‐tailed prairie dog colonies

Wildlife Society Bulletin, 2012
Aerial surveys using line‐intercept methods are one approach to estimate the extent of prairie dog colonies in a large geographic area. Although black‐tailed prairie dogs (Cynomys ludovicianus) construct conspicuous mounds at burrow openings, aerial ...
John G. Sidle, David J. Augustine, Douglas H. Johnson, Sterling D. Miller, Jack F. Cully Jr., Richard P. Reading   +5 more
doaj   +1 more source

Aerial vertical‐looking infrared imagery to evaluate bias of distance sampling techniques for white‐tailed deer

Wildlife Society Bulletin, 2014
Population monitoring requires techniques that produce estimates with low bias and adequate precision. Distance sampling using ground‐based thermal infrared imaging (ground imaging) and spotlight surveys is commonly used to estimate population densities ...
Jared T. Beaver, Craig A. Harper, Robert E. Kissell Jr., Lisa I. Muller, Peyton S. Basinger, Matthew J. Goode, Frank T. Van Manen, Wes Winton, Michael L. Kennedy   +8 more
doaj   +1 more source

Visibility of St Lawrence belugas to aerial photography, estimated by direct observation

NAMMCO Scientific Publications, 2002
The depleted population of belugas (Delphinapterus leucas) inhabiting the St Lawrence estuary, Canada, was monitored by periodic photographic aerial surveys. In order to correct counts made on aerial survey film and to obtain an estimate of the true size
Michael CS Kingsley, Isabelle Gauthier
doaj   +1 more source