scholarly journals UNMANNED AERIAL VEHICLE DERIVED 3D MODEL EVALUATION BASED ON ICESAT-2 FOR ICE SURFACE MICRO-TOPOGRAPHY ANALYSIS IN EAST ANTARCTICA

2021 ◽  
Vol XLIII-B3-2021 ◽  
pp. 463-468
Author(s):  
Y. He ◽  
G. Qiao ◽  
H. Li ◽  
X. Yuan ◽  
Y. Li
Keyword(s):  
Unmanned Aerial Vehicle ◽  
Satellite Altimetry ◽  
Ice Sheet ◽  
Mobile Station ◽  
Zhongshan Station ◽  
Topographic Features ◽  
Ice Surface ◽  
Aerial Vehicle ◽  
Potential Factors ◽  
Micro Topography

Abstract. Modelling of ice sheet micro-topography based on Unmanned Aerial Vehicle (UAV) is meaningful for the understanding of interactions between local ice mass and climate. 3D reconstruction based on UAV has advantages that satellite remote sensing cannot replace. Here, the surface micro-topography measurement was performed during the China's 36th Antarctic expedition (CHINARE) in 2019–2020, using an UAV platform composed of a DJI Phantom 4 and a D-RTK GNSS mobile station around Zhongshan Station of China. Then, four partly overlapped models were obtained by the SfM-MVS technology. Affected by the complex environment factors, the performance of this technology sometimes is challenged over the marginal Antarctic Ice Sheet. Satellite altimetry is one of the most essential technologies for land ice surface elevation measurements, widely used in regional or global ice mass balance estimations.We use the land ice surface heights with high accuracy derived from the Ice, Cloud, and Land Elevation Satellite-2 (ICESat-2) to compare with the UAV-derived models. Combined with the high precision and space-time resolution of ICESat-2 satellite altimetry, the results of the model were evaluated under different terrain conditions. It has been certified that the derived models without extra GCPs were capable of detecting the surface micro-topographic features if considering the potential factors, which can be popularized and developed in polar research.

scholarly journals MODELLING OF GLACIER AND ICE SHEET MICRO-TOPOGRAPHY BASED ON UNMANNED AERIAL VEHICLE DATA, ANTARCTICA

2020 ◽  
Vol XLIII-B3-2020 ◽  
pp. 919-923
Author(s):  
X. Yuan ◽  
G. Qiao ◽  
Y. Li ◽  
H. Li ◽  
R. Xu
Keyword(s):  
Unmanned Aerial Vehicle ◽  
Ice Sheet ◽  
Mobile Station ◽  
Glacier Surface ◽  
Zhongshan Station ◽  
Aerial Photogrammetry ◽  
Vehicle Data ◽  
Melt Water ◽  
Aerial Vehicle ◽  
Micro Topography

Abstract. Modelling of glacier and ice sheet micro-topography is meaningful for the understanding of interactions between local ice mass and climate. Here, we used an Unmanned Aerial Vehicle (UAV) platform composed of a DJI Phantom 4 and a D-RTK mobile station to model the surface micro-topography around Zhongshan Station of China, East Antarctica. Two UAV survey types (vertical and oblique aerial photogrammetry) were performed during the China's 35th Antarctic expedition (CHINARE) in 2018–2019. Six surveys were obtained by the SfM-MVS technology. Then, we extracted the features of glacier surface micro-topography (blue ice, crevasses, ice doline and melt-water). It’s noteworthy that traces of melt-water and a large ice doline appeared on the surface of Dalk Glacier in December 2018. Finally, we concluded that surface micro-topographic features, observable in the UAV-derived models but unavailable on satellite images, may reveal hints for interactions between surface and beneath processes in regional polar glacier.

Antarctic ice velocities from GPS locations logged by seismic stations

2014 ◽  
Vol 27 (2) ◽  
pp. 210-222 ◽  
Author(s):  
Meijian An ◽  
Douglas Wiens ◽  
Chunlei An ◽  
Guitao Shi ◽  
Yue Zhao ◽  
...  
Keyword(s):  
Ice Sheet ◽  
Dome A ◽  
Antarctic Ice Sheet ◽  
Seismic Stations ◽  
West Antarctic Ice Sheet ◽  
Zhongshan Station ◽  
Location Data ◽  
West Antarctic ◽  
Ice Surface ◽  
Passive Seismic

AbstractIn 2007–08, seismologists began deploying passive seismic stations over much of the Antarctic ice sheet. These stations routinely log their position by navigation-grade global positioning system (GPS) receivers. This location data can be used to track the stations situated on moving ice. For stations along the traverse from Zhongshan station to Dome A in East Antarctica and at the West Antarctic Ice Sheet divide the estimated velocities of the ice surface based on positions recorded by navigation-grade GPS are consistent with those obtained by high-accuracy geodetic GPS. Most of the estimated velocities have an angle difference of <28° with the steepest downhill vector of the ice surface slope at the stations. These results indicate that navigation-grade GPS measurements over several months provide reliable information on ice sheet movement of ≥1 m yr-1. With an uncertainty of ~0.3–1 m yr-1, this method is able to resolve both very slow ice velocities near Dome A and velocities of >100 m yr-1 on Thwaites Glacier. Information on ice velocity at three locations for which no data from satellite-based interferometric synthetic aperture radar are available have also been provided using this method.

scholarly journals ANALYSIS OF WAVEFORM RETRACKING METHODS IN ANTARCTIC ICE SHEET BASED ON CRYOSAT-2 DATA

2017 ◽  
Vol XLII-2/W7 ◽  
pp. 1561-1567
Author(s):  
F. Xiao ◽  
F. Li ◽  
S. Zhang ◽  
W. Hao ◽  
L. Yuan ◽  
...  
Keyword(s):  
Satellite Altimetry ◽  
Ice Sheet ◽  
Threshold Level ◽  
Radar Altimeter ◽  
Threshold Method ◽  
Dome A ◽  
Antarctic Ice Sheet ◽  
Waveform Data ◽  
Zhongshan Station ◽  
Waveform Retracking

Satellite altimetry plays an important role in many geoscientific and environmental studies of Antarctic ice sheet. The ranging accuracy is degenerated near coasts or over nonocean surfaces, due to waveform contamination. A postprocess technique, known as waveform retracking, can be used to retrack the corrupt waveform and in turn improve the ranging accuracy. In 2010, the CryoSat-2 satellite was launched with the Synthetic aperture Interferometric Radar ALtimeter (SIRAL) onboard. Satellite altimetry waveform retracking methods are discussed in the paper. Six retracking methods including the OCOG method, the threshold method with 10&amp;thinsp;%, 25&amp;thinsp;% and 50&amp;thinsp;% threshold level, the linear and exponential 5-β parametric methods are used to retrack CryoSat-2 waveform over the transect from Zhongshan Station to Dome A. The results show that the threshold retracker performs best with the consideration of waveform retracking success rate and RMS of retracking distance corrections. The linear 5-β parametric retracker gives best waveform retracking precision, but cannot make full use of the waveform data.

Study on Fault Diagnosis of Planetary Gearbox in Unmanned Aerial Vehicle Using Multi sensor Data

2020 ◽  
Vol 20 (4) ◽  
pp. 332-342
Author(s):  
Hyung Jun Park ◽  
Seong Hee Cho ◽  
Kyung-Hwan Jang ◽  
Jin-Woon Seol ◽  
Byung-Gi Kwon ◽  
...  
Keyword(s):  
Fault Diagnosis ◽  
Unmanned Aerial Vehicle ◽  
Sensor Data ◽  
Planetary Gearbox ◽  
Aerial Vehicle

Results of Spatial Structure of Atmosphere Radiation in a Spectral Range (1.5–2) µm Research

2018 ◽  
pp. 7-13
Author(s):  
Anton M. Mishchenko ◽  
Sergei S. Rachkovsky ◽  
Vladimir A. Smolin ◽  
Igor V . Yakimenko
Keyword(s):  
Spatial Structure ◽  
Unmanned Aerial Vehicle ◽  
Wavelength Range ◽  
Spectral Range ◽  
Near Ir ◽  
Optoelectronic Systems ◽  
Aerial Vehicle

Results of experimental studying radiation spatial structure of atmosphere background nonuniformities and of an unmanned aerial vehicle being the detection object are presented. The question on a possibility of its detection using optoelectronic systems against the background of a cloudy field in the near IR wavelength range is also considered.

Positioning the Angle of Attack Sensor on an Unmanned Aerial Vehicle Wing

2016 ◽  
Vol 3 (1) ◽  
pp. 25-33
Author(s):  
Amir Birjandi ◽  
◽  
Valentin Guerry ◽  
Eric Bibeau ◽  
Hamidreza Bolandhemmat ◽  
...  
Keyword(s):  
Unmanned Aerial Vehicle ◽  
Angle Of Attack ◽  
Aerial Vehicle
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