Results 41 to 50 of about 2,512 (168)

Assessment of the Impact of Surface Water Content for Temperate Forests in SAR Data at C-Band

Remote Sensing, 2023
This study addresses the escalating challenges posed by forest drought and wildfires, emphasizing the critical need to monitor forest conditions to mitigate associated risks.
Costanza Cagnina, Armando Marino, Cristian Silva-Perez, Javier Ruiz-Ramos, Juan Suarez   +4 more
doaj   +1 more source

Mapping ionospheric backscatter measured by the SuperDARN HF radars – Part 2: Assessing SuperDARN virtual height models [PDF]

Annales Geophysicae, 2008
The Super Dual Auroral Radar Network (SuperDARN) network of HF coherent backscatter radars form a unique global diagnostic of large-scale ionospheric and magnetospheric dynamics in the Northern and Southern Hemispheres.
T. K. Yeoman, G. Chisham, L. J. Baddeley, R. S. Dhillon, T. J. T. Karhunen, T. R. Robinson, A. Senior, D. M. Wright   +7 more
doaj   +1 more source

Understanding ‘saturation’ of radar signals over forests

Scientific Reports, 2017
There is an urgent need to quantify anthropogenic influence on forest carbon stocks. Using satellite-based radar imagery for such purposes has been challenged by the apparent loss of signal sensitivity to changes in forest aboveground volume (AGV) above ...
Neha Joshi, Edward T. A. Mitchard, Matthew Brolly, Johannes Schumacher, Alfredo Fernández-Landa, Vivian Kvist Johannsen, Miguel Marchamalo, Rasmus Fensholt   +7 more
doaj   +1 more source

On the collocation between dayside auroral activity and coherent HF radar backscatter [PDF]

Annales Geophysicae, 2000
The 2D morphology of coherent HF radar and optical cusp aurora has been studied for conditions of predominantly southward IMF conditions, which favours low-latitude boundary layer reconnection.
J. Moen, J. Moen, H. C. Carlson, S. E. Milan, N. Shumilov, B. Lybekk, P. E. Sandholt, M. Lester   +7 more
doaj   +1 more source

Sensitivity of Sentinel-1 Backscatter to Management-Related Disturbances in Temperate Forests

Remote Sensing
The rapid and accurate detection of forest disturbances in temperate forests has become increasingly crucial as policy demands and climate pressure on these forests rise.
Sietse van der Woude, Johannes Reiche, Frank Sterck, Gert-Jan Nabuurs, Marleen Vos, Martin Herold   +5 more
doaj   +1 more source

First observations of SPEAR-induced artificial backscatter from CUTLASS and the EISCAT Svalbard radars [PDF]

Annales Geophysicae, 2006
Results are presented from the first two active experimental campaigns undertaken by the new SPEAR (Space Plasma Exploration by Active Radar) high-power system that has recently become operational on Spitzbergen, in the Svalbard archipelago.
T. R. Robinson, T. K. Yeoman, R. S. Dhillon, M. Lester, E. C. Thomas, J. D. Thornhill, D. M. Wright, A. P. van Eyken, I. W. McCrea   +8 more
doaj   +1 more source

Analysis of Onboard Verification Flight Test for the Salinity Satellite Scatterometer

Sensors, 2023
The upcoming Salinity Satellite, scheduled for launch in 2024, will feature the world’s first phased array radar scatterometer. To validate its capability in measuring ocean surface backscatter coefficients, this paper conducts an in-depth analysis of ...
Yongqing Liu, Te Wang, Risheng Yun, Peng Liu, Wenming Lin, Di Zhu, Hao Liu, Xiangkun Zhang   +7 more
doaj   +1 more source

Synthetic aperture radar backscatter is influenced by bubbles at the ice/water interface of an Antarctic lake

Communications Earth & Environment
Synthetic aperture radar is an invaluable tool for monitoring lake ice. This study utilizes synthetic aperture radar to analyze the 2019-2023 backscatter time series of perennially ice-covered Lake Untersee in East Antarctica.
Adam Gaudreau, Denis Lacelle, Dale T. Andersen   +2 more
doaj   +1 more source

Temporal Survey of P- and L-Band Polarimetric Backscatter in Boreal Forests

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2018
Environmental conditions and seasonal variations affect the backscattered radar signal from a forest. This potentially causes errors in a biomass retrieval scheme using data from the synthetic aperture radar (SAR) data.
Albert R. Monteith, Lars M. H. Ulander
doaj   +1 more source

Mapping dynamics of deforestation and forest degradation in tropical forests using radar satellite data

Environmental Research Letters, 2015
Mapping anthropogenic forest disturbances has largely been focused on distinct delineations of events of deforestation using optical satellite images.
Neha Joshi, Edward TA Mitchard, Natalia Woo, Jorge Torres, Julian Moll-Rocek, Andrea Ehammer, Murray Collins, Martin R Jepsen, Rasmus Fensholt   +8 more
doaj   +1 more source