Retrievals of soil moisture and vegetation optical depth using a multi-channel collaborative algorithm

Zhao, Tianjie; Shi, Jiancheng; Entekhabi, Dara; Jackson, Thomas J.; Hu, Lu; Peng, Zhiqing; Yao, Panpan; Li, Shangnan; Kang, Chuen Siang

doi:10.1016/j.rse.2021.112321

Cited by 95 publications

(43 citation statements)

References 88 publications

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“…The loss of soil fertility, a lack of fresh water for drinking, and the increased risk to public health are all consequences of seawater salinity (particularly near coasts) [6,[10][11][12][13]. Because a rise in these pollutants might disrupt the ecology and harm human health and aquatic creature habitats, for those who live on beaches near the ocean, monitoring water-soluble chemicals (including water salinity) is crucial [9,[14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Palm Jumeirah Island’s Construction Effects on the Surrounding Water Quality and Surface Temperatures during 2001–2020

Mansourmoghaddam

Malamiri

Rousta

et al. 2022

Water

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Climate change stressors like rising and warmer seas, increased storms and droughts, and acidifying oceans are rapidly threatening coastal zones, which are the world’s most densely inhabited places. This research assesses the effects of Palm Jumeirah Island (PJI) construction on its surrounding water quality and temperature, using Landsat-7 and 8 spectral and thermal bands for the years 2001, 2014, 2016, 2019, and 2020. To aid in this goal, the changes in water spectral reflectance was observed and interpreted, based on previous research and measurements, to discover the correlation between water quality and its spectral reflectance. Then, the sea surface temperature (SST) was calculated for the years under review and changes in water temperature were evaluated. Finally, the Green Normalized Difference Vegetation Index (GNDVI) and the Normalized Difference Turbidity Index (NDTI) were calculated to estimate water chlorophyll levels and water turbidity, respectively, and changes were observed and interpreted for the time period under review. The present study showed that the PJI construction not only increased the water reflectance in the 0.5–0.8 µm of wavelength, which can be considered to be the increase of suspended sediments and chlorophyll but the water temperature also increased by 7.5 °C during the 19 years. In addition, a gradual increase in the values of GNDVI (by 0.097–0.129) and NDTI (by 0.118~0.172) were observed. A drop in chlorophyll and suspended sediment spectral reflectance and GNDVI and NDTI values were also observed in 2020 compared to 2019 which can be attributed to the 63 to 82% decrease in tourists in Dubai in 2020 as a result of the COVID-19 pandemic. This study aims to draw attention to environmental issues by clarifying the effect of creating artificial islands in the sea and our analysis and results are a suitable reference for specialized hydrological and environmental studies based on spectral information and distance measurements, as presented in this paper.

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Section: Introductionmentioning

confidence: 99%

Assessment of Palm Jumeirah Island’s Construction Effects on the Surrounding Water Quality and Surface Temperatures during 2001–2020

Mansourmoghaddam

Malamiri

Rousta

et al. 2022

Water

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“…The Soil moisture content had a great difference in different sampling areas (Zhang et al, 2019; Zhao et al, 2020, 2021). According to Figure 2 in different soil layers, the soil moisture content follows the sequence of RU > CW > RR > PC.…”

Section: Resultsmentioning

confidence: 99%

“…, the sequence is CW > RU > PC > RR, but there is no significant deviation between the RR model and the PC model (p > 0.05). For the Pielou index, the sequence is CW > RR > RU > PC, but the difference between the RR model and the RU model is not significant (p > 0.05) Zhang et al, 2019;Zhao et al, 2020Zhao et al, , 2021…”

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confidence: 93%

Effects of restoration strategies on wetland: A case‐study of Xinqiang River National Wetland Park

et al. 2022

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Accurately understanding the characteristics of a wetland ecological restoration plant communities and their species diversity relationships is the key to improving wetland management and biodiversity protection. To see the effects of restoration strategies implemented in Xinqiang River National Wetland Park, China, we studied 4 models for ecological restoration, namely protection and conservation (PC), reasonable utilization (RU), restoration and reconstruction (RR) and the building of constructed wetland (CW). We then analyzed the features of the plant communities, species diversity and soil properties, and carried out a correlation analysis between plant communities and the species diversity. Finally, we selected four key communities and analyzed their features and soil properties using a symmetric matrix. Results showed that the soil in the PC model had the highest amount of available phosphorus, available nitrogen and pH value. The soil had higher moisture content in the RU model and CW model than the other 2 models. Based on the correlation analysis, we found that there are obvious common characteristics among different ecological restoration types, that is, the diversity characteristics of tree layer, shrub layer and herb layer have obvious differentiation characteristics. We identified four features of the community characteristics that could improve species diversity: SA, TH, HH and SCD.The results of this study have provided a theoretical basis that there is a coupling relationship between ecological community characteristics and species diversity. The above coupling results have practical significance for maintaining good ecological structure and diversity protection.

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“…Therefore, to improve the spatial resolution of the L-band, two categories of methods are compared in this article. The first category includes the use of the X-band to downscale the L-band data, the TSR algorithm [28,29] and a two-dimensional discrete wavelet transform (2-D DWT) [30]. The second category is interpolation methods that do not use X-band data, including BG optimal interpolation [17], which is implemented for the SMAP mission, and natural neighbour interpolation (NNI) [31].…”

Section: Methodsmentioning

confidence: 99%

An Intercomparison Study of Algorithms for SMAP Brightness Temperature Resolution Enhancement With or Without Information From AMSR2

Zhao

et al. 2022

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

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Soil moisture is an essential variable for understanding water and heat exchanges between land and the atmosphere. Presently, L-band remote sensing technology has been widely employed for routine measurement of soil moisture from space. However, the spatial resolution of L-band soil moisture products obtained from microwave radiometers is too low (dozens of kilometres) to meet the needs of practical applications, such as hydrology modelling, weather forecasts, agricultural applications and water resource management. Therefore, this paper proposes a new concept to downscale the Soil Moisture Active Passive (SMAP) L-band brightness temperature (TB) by using Advanced Microwave Scanning Radiometer-2 (AMSR2) X-band TB data, including the timeseries regression (TSR) algorithm and two-dimensional discrete wavelet transform (2-D DWT) algorithm. An intercomparison study was conducted over a semiarid area located in the Shandian River basin with the other two algorithms of the Backus-Gilbert (BG) optimal interpolation and natural neighbour interpolation (NNI) without using the X-band TB data. The results revealed that the BG algorithm outperformed the NNI, 2D-DWT, and TSR algorithms compared with the original 36-km SMAP TB and airborne 1-km TB data. However, the soil moisture retrievals within one 9-km pixel with 8 soil moisture stations showed that the downscaled L-band TB with X-band data are reliable with lower unbiased root-mean-squared errors compared with resolution-enhanced TB without AMSR2 data.

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Retrievals of soil moisture and vegetation optical depth using a multi-channel collaborative algorithm

Cited by 95 publications

References 88 publications

Assessment of Palm Jumeirah Island’s Construction Effects on the Surrounding Water Quality and Surface Temperatures during 2001–2020

Assessment of Palm Jumeirah Island’s Construction Effects on the Surrounding Water Quality and Surface Temperatures during 2001–2020

Effects of restoration strategies on wetland: A case‐study of Xinqiang River National Wetland Park

An Intercomparison Study of Algorithms for SMAP Brightness Temperature Resolution Enhancement With or Without Information From AMSR2

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