Filters: Tags: aerial survey (X) > partyWithName: Ecosystems (X)
6 results (8ms)|
Filters
Date Range
Extensions Types
Contacts
Categories Tag Types Tag Schemes |
We surveyed fixed-width transects to determine waterbird distribution and estimate relative density. Transects generally paralleled shorelines to maximize efficiency and safety. Fixed-width transects were spaced at 3.2 and 4.8 km intervals and extended up to 32 km offshore so as to include waters with depth up to 80 m. Transects were established using snapPLAN software (TRACK’AIR Aerial Survey Systems, The Netherlands). Surveys were flown at an average ground speed of about 220 km/h at an altitude of about 61-76 m above the water using a US Fish and Wildlife Service fix-winged aircraft (Partenavia P68 Observer 2). Two trained observers, one on each side of the plane, identified and tallied waterbirds within 200...
Categories: Data;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Aerial Survey,
Distribution,
Lake Michigan,
common loon
These data are detections of bison in Grand Canyon National Park made during helicopter surveys between 2019 and 2021, and an aerial infrared imagery survey done in February 2020.
Categories: Data;
Tags: Arizona,
Ecology,
North Rim,
Powell Plateau,
USGS Science Data Catalog (SDC),
Feral burros (Equus asinus) and horses (E. ferus caballus) inhabiting public land in the western United States are intended to be managed at population levels established to promote a thriving, natural ecological balance. Like many large ungulate populations, management agencies employ aerial surveys to obtain estimates of horse and burro population sizes. Double-observer sightability (MDS) models perform well for estimating feral horse abundances, yet the effectiveness of these models for use in burro populations is less understood and may be different due to the smaller size, stoic behavior, and cryptic pelage of burros. These models help minimize detection bias, yet bias can be further reduced with models that...
Categories: Data;
Tags: Arizona,
California,
Ecology,
Fort Irwin National Training Center,
Lake Pleasant Herd Management Area,
These data include image-based classifications of total vegetation from 1965, 1973, 1984, 1992, 2002, 2004, 2005, and 2009, and characteristics of the river channel along the riparian area of the Colorado River between Glen Canyon Dam and Lake Mead Reservoir.
Recent interest has increased related to developing alternative sources of renewable energy to reduce dependence on oil. Some of those sources will include power generation infrastructure and support activities located within continental shelf waters, and potentially within deeper waters off the U.S. Pacific coast and beyond state waters (i.e., outside three nautical miles). Currently, the Bureau of Ocean Energy Management (BOEM) is considering renewable energy proposals off the coast of Oregon. The 2011-2012 Pacific Continental Shelf Environmental Assessment (PaCSEA) project is intended to provide new information on species composition, distribution, abundance, seasonal variation, and habitat utilization among...
These data are detections of burros in the Sinbad Herd Management Area in central Utah made during aerial thermal infrared-based distance sampling surveys in December 2015 and May 2016. Burros were detected from a fixed wing aircraft using an infrared camera mounted on the underside of the aircraft. A monitor screen was inside the aircraft, connected to the camera so the observer could look for burros in the monitor. Aircraft flew at 2,000 feet above ground level. These data were collected to estimate the population size of burros in the Sinbad Herd Management Area and to examine effectiveness between helicopter and aerial thermal infrared survey types. To assess performance of the different survey types, data analyses...
Categories: Data;
Tags: Ecology,
Remote Sensing,
Sinbad Herd Management Area,
USGS Science Data Catalog (SDC),
Utah,
|
|
