scholarly journals ATMOSPHERIC PHASE DELAY CORRECTION OF D-INSAR BASED ON SENTINEL-1A

2018 ◽  
Vol XLII-3 ◽  
pp. 955-960
Author(s):  
X. Li ◽  
G. Huang ◽  
Q. Kong
Keyword(s):  
Yellow River ◽  
Atmospheric Correction ◽  
Yellow River Delta ◽  
Phase Delay ◽  
Tropospheric Delay ◽  
Atmospheric Effects ◽  
Monitoring Accuracy ◽  
Before And After ◽  
Subsidence Monitoring ◽  
Delay Correction

In this paper, we used the Generic Atmospheric Correction Online Service for InSAR (GACOS) tropospheric delay maps to correct the atmospheric phase delay of the differential interferometric synthetic aperture radar (D-InSAR) monitoring, and we improved the accuracy of subsidence monitoring using D-InSAR technology. Atmospheric phase delay, as one of the most important errors that limit the monitoring accuracy of InSAR, would lead to the masking of true phase in subsidence monitoring. For the problem, this paper used the Sentinel-1A images and the tropospheric delay maps got from GACOS to monitor the subsidence of the Yellow River Delta in Shandong Province. The conventional D-InSAR processing was performed using the GAMMA software. The MATLAB codes were used to correct the atmospheric delay of the D-InSAR results. The results before and after the atmospheric phase delay correction were verified and analyzed in the main subsidence area. The experimental results show that atmospheric phase influences the deformation results to a certain extent. After the correction, the measurement error of vertical deformation is reduced by about 18 mm, which proves that the removal of atmospheric effects can improve the accuracy of the D-InSAR monitoring.

scholarly journals Atmospheric phase delay correction of PS-InSAR to Monitor Land Subsidence in Surabaya

2021 ◽  
Vol 936 (1) ◽  
pp. 012033
Author(s):  
Toifatul Ulma ◽  
Ira Mutiara Anjasmara ◽  
Noorlaila Hayati
Keyword(s):  
Land Subsidence ◽  
Atmospheric Correction ◽  
Significance Test ◽  
Phase Delay ◽  
Tropospheric Delay ◽  
Interferometric Synthetic Aperture Radar ◽  
Subsidence Area ◽  
Persistent Scatterers ◽  
Before And After ◽  
Delay Correction

Abstract Atmospheric phase delay is one of the most significant errors limiting the accuracy of Interferometric Synthetic Aperture Radar (InSAR) results. In this research, we used the Generic Atmospheric Correction Online Service for InSAR (GACOS) data to correct the tropospheric delay modeling from the persistent scatterers’ InSAR monitoring. Eighty-one (81) Sentinel-1A images and tropospheric delay maps from GACOS monitored land subsidence in Surabaya city between 2017 and 2019. InSAR processing was carried out using the GMTSAR software, continued with StaMPS and TRAIN, which were used to correct the tropospheric delay of PSInSAR-derived deformation measurements. The results before and after the atmospheric phase delay correction using GACOS were confirmed and analyzed in the main subsidence area. The findings of the experiments reveal that the atmospheric phase affects the mean LOS velocity results to some extent. The average difference between PS-InSAR before and after tropospheric correction is 1.734 mm/year with a standard deviation of 0.550 mm/year. The significance test of the two variables, 95%, showed that the tropospheric correction with GACOS data could affect the PS-InSAR results. Furthermore, GACOS correction may increase the error at some points, which could be due to its turbulence data’s low accuracy.

scholarly journals New Approaches to Processing Ground-based SAR (GBSAR) Data for Deformation Monitoring

2018 ◽  
Vol 10 (12) ◽  
pp. 1936 ◽  
Author(s):  
Sichun Long ◽  
Aixia Tong ◽  
Ying Yuan ◽  
Zhenhong Li ◽  
Wenhao Wu ◽  
...  
Keyword(s):  
Signal To Noise Ratio ◽  
Atmospheric Correction ◽  
Deformation Monitoring ◽  
Atmospheric Effects ◽  
Threshold Optimization ◽  
Before And After ◽  
Multiple Threshold ◽  
The Stability ◽  
Average Coherence

In this paper, aiming at the limitation of persistence scatterers (PS) points selection, a new method for selecting PS points has been introduced based on the average coherence coefficient, amplitude dispersion index, estimated signal-to-noise ratio and displacement standard deviation of multiple threshold optimization. The stability and quality of this method are better than that of a single model. In addition, an atmospheric correction model has also been proposed to estimate the atmospheric effects on Ground-based synthetic aperture radar (GBSAR) observations. After comparing the monitoring results before and after correction, we clearly found that the results are in good agreement with the actual observations after applying the proposed atmospheric correction approach.

Yellow River Estuary Coastline Change Analysis before and after the Water and Sediment Regulation in 12 Years

2014 ◽  
Vol 955-959 ◽  
pp. 3883-3886
Author(s):  
Hai Bo Yang ◽  
Yun Fei Li ◽  
Jia Hua Wei
Keyword(s):  
Yellow River ◽  
River Estuary ◽  
Yellow River Delta ◽  
Change Analysis ◽  
Water Index ◽  
Coastline Change ◽  
Water And Sediment ◽  
Before And After ◽  
Normalized Difference Water Index ◽  
Water And Sediment Regulation

Based on the Landsat TM images of the Yellow River Delta from 2002 to 2013, the coastlines before and after water and sediment regulation in each year were extracted by the Normalized Difference Water Index (NDWI) with RS and GIS software. The dynamic changes of coastlines were analyzed in combination with the conditions of water and sediment regulation. The results show that the coastlines were generally pushed ahead though it changed ahead and back alternately in the past decade. The coastline near the estuary changed more obviously than other area. There is a positive linear relationship between the rate of the coastline pushing ahead and the ratio of the water and sediment quantity discharged into the sea in this region.

Effect of Ecological Water Supplement on Land Use and Land Cover Changes in Diaokou River

2013 ◽  
Vol 864-867 ◽  
pp. 2403-2407 ◽  
Author(s):  
Guo Tao Dong ◽  
Kui Huang ◽  
Su Zhen Dang ◽  
Xiao Wei Gu ◽  
Wen Li Yang
Keyword(s):  
Land Use ◽  
Land Cover ◽  
Large Scale ◽  
Yellow River ◽  
Yellow River Delta ◽  
The Yellow River ◽  
Land Cover Changes ◽  
Water And Sediment ◽  
Before And After ◽  
The Impact

Diaokou River is one of the old courses of the Yellow River access to the sea before 1976 and its estuarine delta is an important part of National Nature Reserve of Yellow River Delta. The Yellow River Conservancy Commission decided the ecological water supplement to the wetland during the water and sediment regulation period in 2010. In this study, we analyzed the land use and land cover changes before and after the ecological water supplement in Diaokou River by using HJ-1B CCD data. The impact of the ecological water supplement on land use and land cover changes in Diaokou River was remarkable. The expansion of shrub-grassland and water body at large scale is conspicuous, while decreasing areas of shallows was 15.03 km2 and unutilized land decreasing amplitude was 28%. The main area of land use change was in Yiqianer protected areas, where concentrated in the estuary of the Diaokou River.

Changes in Soil Properties before and after Wetland Degradation in the Yellow River Delta, China

2012 ◽  
Vol 40 (10) ◽  
pp. 1125-1130 ◽  
Author(s):  
Chen Huang ◽  
Junhong Bai ◽  
Hongbo Shao ◽  
Haifeng Gao ◽  
Rong Xiao ◽  
...  
Keyword(s):  
Soil Properties ◽  
Yellow River ◽  
Yellow River Delta ◽  
River Delta ◽  
The Yellow River ◽  
Wetland Degradation ◽  
The Yellow River Delta ◽  
Before And After ◽  
Changes In Soil Properties
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