Observations and geophysical value-added datasets for cold high mountain and polar regions

Qiu, Yubao; Lappalainen, Hanna; Che, Tao; Sandven, Stein; Zhao, Tianjie

doi:10.1080/20964471.2022.2154974

Cited by 4 publications

(3 citation statements)

References 21 publications

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“…This, in turn, enables the computation of the specular incidence angle. As a result, the SR for LR polarization can be obtained using (5). The LAGRS F/T model calculates DDM observables, which are subsequently employed to differentiate between near-surface frozen and thawed states.…”

Section: Lagrs-ft Model For Delay Doppler Mapping Waveformmentioning

confidence: 99%

“…While traditional methods can accurately describe the F/T cycle at a point scale and provide ground information for validation purposes, they are limited in their applicability to large-scale and long-term trend analyses [5]. Therefore, there is a need for remote sensing techniques that can capture F/T dynamics over extensive areas and extended time periods.…”

Section: Introductionmentioning

confidence: 99%

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Assessing the Freeze/Thaw States in Arctic Circle Using FengYun-3E GNOS-R: An Initial Demonstration and Analysis

Wu,

Ouyang,

et al. 2024

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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In this article, we present the first demonstration of the FengYun-3E (FY3E) Global Navigation Satellite System Occultation Sounder II-Reflectometry (GNOS-R) payload's capacity to detect near-surface soil freeze/thaw (F/T) states. This study offers an initial analysis of the F/T retrieval algorithm applied to data collected from the Arctic Circle, underscoring the GNOS-R's potential to deliver long-term near-surface soil F/T products. Data for the period extending from the launch day of GNOS-R (Day of Year (DOY) 179, 2021) to DOY 270 in 2022 were analyzed using the surface reflectivity (SR) ratio factor to discriminate F/T variations.Comparisons were made with soil moisture active passive (SMAP) F/T products, serving as an auxiliary analysis. We found a strong consistency between SR ratio factor and SMAP F/T values, with the accuracy of the F/T retrieval algorithm exceeding 60%. These findings corroborate the efficacy of the GNOS-R payload aboard FY3E in monitoring F/T patterns at higher latitudes, specifically, the Arctic Circle. The outcomes of this study will be beneficial for future F/T detection efforts using spaceborne Global Navigation Satellite System-Reflectometry payloads.

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Section: Lagrs-ft Model For Delay Doppler Mapping Waveformmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assessing the Freeze/Thaw States in Arctic Circle Using FengYun-3E GNOS-R: An Initial Demonstration and Analysis

Wu,

Ouyang,

et al. 2024

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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“…This provides spatial planning guidance for the development and regeneration of traditional village settlements but the samples of spatial data still need to be expanded to focus on village diversity [25]. Research on village settlements in high-altitude areas has mostly focused on ecological resources [33]. Due to their complex terrain and roads, it is difficult to extract village space data in these areas.…”

Section: Visualization and Datatization Of Village Settlement Spatial...mentioning

confidence: 99%

Exploring Village Spatial Patterns for Sustainable Development: A Case Study of Diqing Prefecture

Liu,

Zhang,

et al. 2023

Sustainability

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Alexander’s A Pattern Language is an important text and focuses on the theory of diverse environmental spatial sustainability. With the contemporary digital development of villages, it is urgent that village spatial patterns are analyzed in a scientific and quantitative way in order to determine heritage village diversity. The village settlements in the Diqing region are typical representatives, having a changeable terrain, being large in number, and being multi-ethnic in China; in recent years, they have also faced slow development and limited conditions. However, few studies have focused on the multiple quantitative analysis of the diverse spatial patterns of village settlements in an ethnic minority region. Therefore, this study selects 2486 village settlements in Diqing and, using KED, NNI SSIA, etc., proposes a spatial pattern analysis framework (SPAF) based on pattern language theory. According to the spatial influencing factors, spatial analysis criteria are constructed to analyze the village spatial pattern types and subtypes. The results show that the region’s topographic conditions are the dominant factors that form the diversified village spatial patterns existent in the Diqing Prefecture. Among them, the dominant pattern of building villages along slopes with a small-population scale and large-dispersed settlements achieves a healthy and sustainable living environment that is oriented well, cost-saving, and conforms to nature. Meanwhile, the dominant pattern is also the reason for the inhibition of development due to inconvenient transportation and difficult management. Therefore, sustainable strategies should strike a balance between the two opposites. Based on the SPAF, spatial patterns can be effectively extracted for diverse village spaces, providing digital and visual references for the regeneration of contemporary rural areas.

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Investigating the seasonal dynamics of surface water over the Qinghai–Tibet Plateau using Sentinel-1 imagery and a novel gated multiscale ConvNet

Luo

Liu

2023

International Journal of Digital Earth

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Observations and geophysical value-added datasets for cold high mountain and polar regions

Cited by 4 publications

References 21 publications

Assessing the Freeze/Thaw States in Arctic Circle Using FengYun-3E GNOS-R: An Initial Demonstration and Analysis

Assessing the Freeze/Thaw States in Arctic Circle Using FengYun-3E GNOS-R: An Initial Demonstration and Analysis

Exploring Village Spatial Patterns for Sustainable Development: A Case Study of Diqing Prefecture

Investigating the seasonal dynamics of surface water over the Qinghai–Tibet Plateau using Sentinel-1 imagery and a novel gated multiscale ConvNet

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