Results 121 to 130 of about 53,424 (245)

Precise Geolocation of UAV SAR Images Using a Triple-View Configuration Without DEM Data

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
To overcome the limitations of synthetic aperture radar (SAR) image geolocation onboard unmanned aerial vehicles (UAVs) without the high-resolution digital elevation model (DEM) data, multipass geolocation methods have been explored.
Jing Ning, Chao Wang, Yunhua Luo, Yao Zhao, Peichen Yu, Yixian Tang   +5 more
doaj   +1 more source

Uncovering temporal patterns of wildlife activity, habitat use and habitat preference from camera‐trap data

Methods in Ecology and Evolution, EarlyView.
Abstract An understanding of habitat use and levels of active behaviour is foundational to wildlife behaviour, ecology, conservation and management. These variables are commonly measured by tracking individuals in space and time using biologging. In principle, camera‐trap data also contain information about both activity level and habitat use; however,
J. Marcus Rowcliffe, Laurens R. Dijkhuis, Patrick A. Jansen   +2 more
wiley   +1 more source

A Terrain-Constrained Cross-Correlation Matching Method for Laser Footprint Geolocation

Remote Sensing
The full-waveform spaceborne laser altimeter improves footprint geolocation accuracy through waveform matching, providing critical data for on-orbit calibration. However, in areas with significant topographic variations or complex surface characteristics,
Sihan Zhou, Pufan Zhao, Jian Yang, Qijin Han, Yue Ma, Hui Zhou, Song Li   +6 more
doaj   +1 more source

Optical Geolocation for Small Unmanned Aerial Systems [PDF]

This paper presents an airborne optical geolocation system using four optical targets to provide position and attitude estimation for a sUAS supporting the NASA Acoustic Research Mission (ARM), where the goal is to reduce nuisance airframe noise during ...
Dolph, Chester V., Humphreys, William M., Jr., Khorrami, Mehdi R., Lockard, David P., McSwain, Robert G.   +4 more
core   +1 more source

Field‐level crop choice responses to weather‐induced yield shocks in the US Corn Belt

American Journal of Agricultural Economics, EarlyView.
Abstract As climate change increases the frequency and severity of extreme heat events, farmers are expected to face greater variability in crop yields. Using 10 million field‐level observations, this study examines how farmers in the US Corn Belt adjust corn–soybean rotation decisions in response to yield shocks largely driven by weather fluctuations.
Seunghyun Lee
wiley   +1 more source

An Adaptive Sensor Selection and Ray-Tracing-Assisted TDOA Method for HF Skywave Source Geolocation With Experimental Validation

IEEE Open Journal of Antennas and Propagation
High-frequency (HF) skywave signals can propagate across vast distances due to ionospheric refraction, rendering conventional line-of-sight (LOS) geolocation methods inadequate for accurate source localization.
Chen Xu, Houlong Ai, Hao Zhao, Zhaoyang Li, Xijun Liu   +4 more
doaj   +1 more source

When wine walked into grocery stores: Examining the (un)intended economic consequences of wine Sale reform in Tennessee

American Journal of Agricultural Economics, EarlyView.
Abstract Alcohol policy liberalization is a contentious issue in the United States, including debates over whether grocery stores should be allowed to sell wine. This issue reflects a dilemma between accommodating consumer convenience, promoting wine industry growth, and generating tax revenue, versus concerns about potential harm to liquor stores ...
Jiayu Sun, Vincenzina Caputo, Aaron J. Staples, Achilleas Vassilopoulos   +3 more
wiley   +1 more source

Density dependence and habitat selection affect overwintering abundance of monarch butterflies at regional and site scales in California

Conservation Science and Practice, EarlyView.
We analyzed annual overwintering counts in California to understand monarch population fluctuations. Climate and density‐dependent factors explain 64% of annual variability across groves, with density dependence being the primary driver. Within groves, tree characteristics and microclimate significantly influence monarch habitat selection, with ...
Peter C. Ibsen, Zachary H. Ancona, Emma Pelton, Stephanie Little, Jay E. Diffendorfer   +4 more
wiley   +1 more source

‘Escaping Isn't for Everyone’: Kurdish Smugglers’ Navigational Tactics at Checkpoints in Iran

Development and Change, EarlyView.
ABSTRACT This article examines how Kurdish smugglers navigate state and insurgent checkpoints in the borderlands of western Iran. Drawing on ethnographic research, it analyses two key navigational tactics: persin, a form of negotiated passage involving transaction, recognition and the contingent toleration of authority; and jimi, rendered here as ...
Peyman Zinati
wiley   +1 more source

GOLD plasma bubble observations comparison with geolocation of plasma irregularities by back propagation of the high-rate FORMOSA7/COSMIC 2 scintillation data

Frontiers in Astronomy and Space Sciences
Using the high-rate phase and amplitude scintillation data from FORMOSA7/COSMIC two mission and back-propagation method, we geolocate plasma irregularities that cause scintillations.
Qian Wu, Qian Wu, John Braun, Sergey Sokolovskiy, William Schreiner, Nicholas Pedatella, Nicholas Pedatella, Jan-Peter Weiss, Iurii Cherniak, Irina Zakharenkova   +9 more
doaj   +1 more source