Geodesy and Geodynamics最新文献_第6页

Height connection across sea by using satellite altimetry data sets, ellipsoidal heights, astrogeodetic deflections of the vertical, and an Earth Gravity Model 利用卫星测高数据集、椭球面高度、垂直方向的天文测量偏差和地球重力模型进行跨海高度连接

IF 2.4 4区地球科学

Geodesy and Geodynamics Pub Date : 2023-07-01 DOI: 10.1016/j.geog.2022.11.010

Jianbo Wang , Xinmin Qi , Kai Luo , Zhengyuan Li , Ruikang Zhou , Jinyun Guo

{"title":"Height connection across sea by using satellite altimetry data sets, ellipsoidal heights, astrogeodetic deflections of the vertical, and an Earth Gravity Model","authors":"Jianbo Wang , Xinmin Qi , Kai Luo , Zhengyuan Li , Ruikang Zhou , Jinyun Guo","doi":"10.1016/j.geog.2022.11.010","DOIUrl":"10.1016/j.geog.2022.11.010","url":null,"abstract":"<div>Islands and the mainland are separated by seas, and the distances between them might be so long that the height on the mainland cannot be exactly translated to the islands, resulting in different height systems on the mainland and the islands. In this study, we used astrogeodetic deflections of the vertical and ellipsoidal heights of points on the mainland and island near their coastlines to implement height connection across sea areas. First, the modeled gravity and modeled astrogeodetic vertical deflections of segmentation points along connecting routes over the sea between the mainland and the island were determined by Earth Gravity Model (EGM), and the ellipsoidal heights of segmentation points were determined by the satellite altimetry data sets. Second, we used a linear interpolation model to increase the precision of the vertical deflections of segmentation points. Third, we computed the geopotential difference of points between the mainland and the island using a method derived from geopotential theory and the astronomical leveling principle. Finally, we estimated the normal height of the point on the island using the geopotential-difference iterative computation approach. Using observed data of normal heights, ellipsoidal heights, and astrogeodetic vertical deflections referring to height sites in Qingdao, Shandong Province, we conducted a numerical experiment involving the normal height connection across sea regions. We determined the data of the ellipsoidal heights and gravity of segmentation points along the connecting route across the water in the numerical experiment using DTU10. The distance of the height connection across the sea was approximately 10.5 km. According to China's official leveling specifications, the experimental results met the criterion of third-class leveling precision.</div>","PeriodicalId":46398,"journal":{"name":"Geodesy and Geodynamics","volume":"14 4","pages":"Pages 347-354"},"PeriodicalIF":2.4,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47205439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Tidal triggering of seismicity in the region of Palu, Central Sulawesi, Indonesia 印度尼西亚中苏拉威西巴鲁地区地震活动的潮汐触发

IF 2.4 4区地球科学

Geodesy and Geodynamics Pub Date : 2023-07-01 DOI: 10.1016/j.geog.2022.12.002

Ibnu Nurul Huda , Sébastien Lambert , Jean Souchay

引用次数: 1

Fast 3D joint inversion of gravity and magnetic data based on cross gradient constraint 基于交叉梯度约束的重磁数据三维快速联合反演

IF 2.4 4区地球科学

Geodesy and Geodynamics Pub Date : 2023-07-01 DOI: 10.1016/j.geog.2022.12.003

Sheng Liu , Xiangyun Wan , Shuanggen Jin , Bin Jia , Songbai Xuan , Quan Lou , Binbin Qin , Rongfu Peng , Dali Sun

{"title":"Fast 3D joint inversion of gravity and magnetic data based on cross gradient constraint","authors":"Sheng Liu , Xiangyun Wan , Shuanggen Jin , Bin Jia , Songbai Xuan , Quan Lou , Binbin Qin , Rongfu Peng , Dali Sun","doi":"10.1016/j.geog.2022.12.003","DOIUrl":"10.1016/j.geog.2022.12.003","url":null,"abstract":"<div>The gravity and magnetic data can be adopted to interpret the internal structure of the Earth. To improve the calculation efficiency during the inversion process and the accuracy and reliability of the reconstructed physical property models, the triple strategy is adopted in this paper to develop a fast cross-gradient joint inversion for gravity and magnetic data. The cross-gradient constraint contains solving the gradients of the physical property models and performing the cross-product calculation of their gradients. The sparse matrices are first obtained by calculating the gradients of the physical property models derived from the first-order finite difference. Then, the triple method is applied to optimize the storages and the calculations related to the gradients of the physical property models. Therefore, the storage compression amount of the calculations related to the gradients of the physical property models and the cross-gradient constraint are reduced to one-fold of the number of grid cells at least, and the compression ratio increases with the increase of the number of grid cells. The test results from the synthetic data and field data prove that the structural coupling is achieved by using the fast cross-gradient joint inversion method to effectively reduce the multiplicity of solutions and improve the computing efficiency.</div>","PeriodicalId":46398,"journal":{"name":"Geodesy and Geodynamics","volume":"14 4","pages":"Pages 331-346"},"PeriodicalIF":2.4,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46899172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Polar motion prediction using the combination of SSA and ARMA 结合SSA和ARMA的极运动预测

IF 2.4 4区地球科学

Geodesy and Geodynamics Pub Date : 2023-07-01 DOI: 10.1016/j.geog.2022.12.004

Qiaoli Kong , Jingwei Han , Xin Jin , Changsong Li , Tianfa Wang , Qi Bai , Yanfei Chen

{"title":"Polar motion prediction using the combination of SSA and ARMA","authors":"Qiaoli Kong , Jingwei Han , Xin Jin , Changsong Li , Tianfa Wang , Qi Bai , Yanfei Chen","doi":"10.1016/j.geog.2022.12.004","DOIUrl":"10.1016/j.geog.2022.12.004","url":null,"abstract":"<div>High-precision polar motion (PM) prediction is of important significance in astronomy, geodesy, aviation, hydrographic mapping, interstellar navigation, and so on. SSA can effectively extract the trend and period terms of PM,in the process of achieving high-precision medium- and long-term polar motion prediction, it is necessary to solve the end effect problem and overfitting problem of SSA forecasting method; therefore, ARMA was applied to decreasethe end effect, and a suitable combination of reconstructed components was determined to avoid the high variance reaction of SSA overfitting. Based on the decomposition and reconstruction of the PM by SSA, the reconstructed components are determined to participate in the SSA iterative fitting model according to the variance contribution rate. The combination of the reconstructed components representing the polar motion period term and the trend term is determined according to the correlation analysis of the selected reconstructed components. After the above work, the principal component prediction sequence is obtained by fitting the period term and the trend term to convergence, respectively, and then, the SSA end effect is modified, and the residual term is predicted based on ARMA. The test results show that he prediction accuracy of SSA + ARMA at the front of the X and Y directions are improved by 96.90% and 97.53% compared with those of SSA, respectively, and the forecast accuracy of 365 days are improved by 37.93% and 19.53% in the X and Y directions compared with those of Bulletin A, respectively.</div>","PeriodicalId":46398,"journal":{"name":"Geodesy and Geodynamics","volume":"14 4","pages":"Pages 368-376"},"PeriodicalIF":2.4,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48828496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improved cat swarm optimization for parameter estimation of mixed additive and multiplicative random error model 混合加性与乘性随机误差模型参数估计的改进cat群算法

IF 2.4 4区地球科学

Geodesy and Geodynamics Pub Date : 2023-07-01 DOI: 10.1016/j.geog.2022.10.003

Leyang Wang , Shuhao Han

{"title":"Improved cat swarm optimization for parameter estimation of mixed additive and multiplicative random error model","authors":"Leyang Wang , Shuhao Han","doi":"10.1016/j.geog.2022.10.003","DOIUrl":"10.1016/j.geog.2022.10.003","url":null,"abstract":"<div>To estimate the parameters of the mixed additive and multiplicative (MAM) random error model using the weighted least squares iterative algorithm that requires derivation of the complex weight array, we introduce a derivative-free cat swarm optimization for parameter estimation. We embed the Powell method, which uses conjugate direction acceleration and does not need to derive the objective function, into the original cat swarm optimization to accelerate its convergence speed and search accuracy. We use the ordinary least squares, weighted least squares, original cat swarm optimization, particle swarm algorithm and improved cat swarm optimization to estimate the parameters of the straight-line fitting MAM model with lower nonlinearity and the DEM MAM model with higher nonlinearity, respectively. The experimental results show that the improved cat swarm optimization has faster convergence speed, higher search accuracy, and better stability than the original cat swarm optimization and the particle swarm algorithm. At the same time, the improved cat swarm optimization can obtain results consistent with the weighted least squares method based on the objective function only while avoiding multiple complex weight array derivations. The method in this paper provides a new idea for theoretical research on parameter estimation of MAM error models.</div>","PeriodicalId":46398,"journal":{"name":"Geodesy and Geodynamics","volume":"14 4","pages":"Pages 385-391"},"PeriodicalIF":2.4,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46546031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of the effect of the 2021 Semeru eruption on water vapor content and atmospheric particles using GNSS and remote sensing 利用GNSS和遥感分析2021年塞默鲁火山喷发对水蒸气含量和大气颗粒的影响

4区地球科学

Geodesy and Geodynamics Pub Date : 2023-06-13 DOI: 10.1016/j.geog.2023.04.005

Mokhamad Nur Cahyadi , Arizal Bawasir , Syachrul Arief , Amien Widodo , Meifal Rusli , Deni Kusumawardani , Yessi Rahmawati , Ana Martina , Putra Maulida , Hilda Lestiana

{"title":"Analysis of the effect of the 2021 Semeru eruption on water vapor content and atmospheric particles using GNSS and remote sensing","authors":"Mokhamad Nur Cahyadi , Arizal Bawasir , Syachrul Arief , Amien Widodo , Meifal Rusli , Deni Kusumawardani , Yessi Rahmawati , Ana Martina , Putra Maulida , Hilda Lestiana","doi":"10.1016/j.geog.2023.04.005","DOIUrl":"10.1016/j.geog.2023.04.005","url":null,"abstract":"<div>Mount Semeru, an active volcano in East Java, Indonesia, erupted on December 4, 2021, following extreme rainfall that caused an avalanche of hot pyroclastic flows and lava. The tropospheric conditions and dominant particle components in the atmosphere can be monitored using Global Navigation Satellite System (GNSS) technology and remote sensing satellites. GNSS signal propagation delay in Precise Point Positioning (PPP) processing can be used to determine Zenith Tropospheric Delay (ZTD) and Precipitable Water Vapor (PWV) variables so that atmospheric conditions can be generated. In addition, by using remote sensing satellite data, it is possible to obtain rainfall data with high temporal resolution as well as the dominant particle and gas content values during eruptions. During the eruption period, the high value of PWV was dominated by the high intensity of precipitation during the rainy season. High rainfall before the eruption caused activity inside the mountain to increase, which occurred in avalanche type eruption. Apart from that, the atmosphere around Semeru was also dominated by SO2 content, which spreaded for tens of kilometers. SO2 content began to be detected significantly by remote sensing sensors on December 7, 2021. In this study, deformation and atmospheric monitoring were also carried out using low-cost GNSS at the Semeru Monitoring Station on September 9–15, 2022. The results of the ZTD and ZWD values show the dominance of the wet component, which is directly proportional to rainfall activity in this period.</div>","PeriodicalId":46398,"journal":{"name":"Geodesy and Geodynamics","volume":"15 1","pages":"Pages 33-41"},"PeriodicalIF":0.0,"publicationDate":"2023-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1674984723000393/pdfft?md5=9c34be05e04b8a1e0d64de738daf64da&pid=1-s2.0-S1674984723000393-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46369254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Periodic signal extraction of GNSS height time series based on adaptive singular spectrum analysis 基于自适应奇异谱分析的 GNSS 高度时间序列周期信号提取

4区地球科学

Geodesy and Geodynamics Pub Date : 2023-06-05 DOI: 10.1016/j.geog.2023.04.003

Chenfeng Li , Peibing Yang , Tengxu Zhang , Jiachun Guo

引用次数: 0

Constraint on the focal mechanism of the 2011 Tohoku earthquake from the radial modes 辐射模态对2011年东北地震震源机制的约束

4区地球科学

Geodesy and Geodynamics Pub Date : 2023-06-02 DOI: 10.1016/j.geog.2023.04.002

Weikun Chen, Hao Ding

{"title":"Constraint on the focal mechanism of the 2011 Tohoku earthquake from the radial modes","authors":"Weikun Chen, Hao Ding","doi":"10.1016/j.geog.2023.04.002","DOIUrl":"10.1016/j.geog.2023.04.002","url":null,"abstract":"<div>Different from other normal modes of the Earth's free oscillation that depend on all the six components (Mrr, Mtt, Mpp, Mrt, Mrp, and Mtp) of the centroid moment tensor, the amplitudes of the radial modes depend on the Mrr component (e.g., scalar moment (M0), dip (δ), and slip (λ)) and hypocenter depth of the focal mechanism, and hence can be easily used to constrain these parameters of the focal mechanism. In this study, we use the superconducting gravimeter (SG) records after the 2011 Tohoku earthquake to analyze the radial modes 0S0 and 1S0. Based on the solutions of the focal mechanism provided by the GCMT and USGS, we can obtain the theoretical amplitudes of these two radial modes. Comparing the theoretical amplitudes with the observation amplitudes, it is found that there are obvious differences between the former and the latter, which means that the GCMT and USGS focal mechanisms cannot well represent the real focal mechanism of the 2011 event. Taking the GCMT solution as a reference and changing the depth and the three parameters of the Mrr moment, the scalar moment (M0) and the dip (δ) have significant influences, but the effects of the slip (λ) and the depth are minor. After comparisons, we provide a new constraint (M0 = 5.8 ± 0.09 × 1022 N·m, δ = 10.1 ± 0.08°, λ = 88°, and depth = 20 km) for the focal mechanism of the 2011 event. In addition, we further determine the center frequency (1.631567 ± 2.6e-6 mHz) and quality factor (2046.4± 50.1) of the 1S0 mode.</div>","PeriodicalId":46398,"journal":{"name":"Geodesy and Geodynamics","volume":"15 1","pages":"Pages 27-32"},"PeriodicalIF":0.0,"publicationDate":"2023-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1674984723000344/pdfft?md5=1e4dab9e5a3d840101165fa174842b95&pid=1-s2.0-S1674984723000344-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43138460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The dual choice of geodetic horizontal reference systems for Ukraine 乌克兰大地测量水平参考系的双重选择

IF 2.4 4区地球科学

Geodesy and Geodynamics Pub Date : 2023-05-01 DOI: 10.1016/j.geog.2022.11.001

Elena Novikova, Alena Palamar, Rostyslav Lopunov

{"title":"The dual choice of geodetic horizontal reference systems for Ukraine","authors":"Elena Novikova, Alena Palamar, Rostyslav Lopunov","doi":"10.1016/j.geog.2022.11.001","DOIUrl":"10.1016/j.geog.2022.11.001","url":null,"abstract":"<div>Almost all European countries use at least two horizontal reference systems, which allow them to minimize all risks when changing the coordinate system. The first system is used for the needs of the national survey in general, and also for technical applications in engineering surveys. A brief description of this system can be written by the formula: Geocentric Ellipsoid (GRS80) + Projection (UTM). More than half of the European countries for the second national systems use the GRS80 geocentric ellipsoid together with a projection other than UTM, some of them continue to use the projection of the old coordinate systems. The rest of the countries, excluding Ukraine, adapted the existing national coordinate systems to modern requirements, removing deformations from them concerning the ETRS89. A small number of European countries have implemented the GRS80 geocentric ellipsoid together with the UTM projection for cadastral surveys and topographic maps with a scale of 1:5000 and larger. Only one country, Ukraine, chose a variant for the new coordinate system (UCS2000), which is briefly written by the formula: Old Not Geocentric Ellipsoid + New Projection. The analysis of modern coordinate systems of Europe made it possible to formulate two variants of the future coordinate system of Ukraine based on a geocentric ellipsoid. It is shown that the transition to a geocentric ellipsoid will change the coordinates and heights of the points, but practically will not change the distance between the points and the area of the parcels.</div>","PeriodicalId":46398,"journal":{"name":"Geodesy and Geodynamics","volume":"14 3","pages":"Pages 254-264"},"PeriodicalIF":2.4,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48269691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spatial and temporal analysis of urban heat island effect over Tiruchirappalli city using geospatial techniques 基于地理空间技术的蒂鲁奇拉帕利市城市热岛效应时空分析

IF 2.4 4区地球科学

Geodesy and Geodynamics Pub Date : 2023-05-01 DOI: 10.1016/j.geog.2022.10.004

Ajay Badugu , K.S. Arunab , Aneesh Mathew , P. Sarwesh

{"title":"Spatial and temporal analysis of urban heat island effect over Tiruchirappalli city using geospatial techniques","authors":"Ajay Badugu , K.S. Arunab , Aneesh Mathew , P. Sarwesh","doi":"10.1016/j.geog.2022.10.004","DOIUrl":"10.1016/j.geog.2022.10.004","url":null,"abstract":"<div>Alterations made to the natural ground surface and the anthropogenic activity elevate the surface and air temperature in the urban areas compared with the surrounding rural areas, known as urban heat island effect. Thermal remote sensors measure the radiation emitted by ground objects, which can be used to estimate the land surface temperature and are beneficial for studying urban heat island effects. The present study investigates the spatial and temporal variations in the effects of urban heat island over Tiruchirappalli city in India during the summer and winter seasons. The study also identifies hot spots and cold spots within the study area. In this study, a significant land surface temperature difference was observed between the urban and rural areas, predominantly at night, indicating the presence of urban heat island at night. These diurnal land surface temperature fluctuations are also detected seasonally, with a relatively higher temperature intensity during the summer. The trend line analysis shows that the mean land surface temperature of the study area is increasing at a rate of 0.166 K/decade with p less than 0.01. By using the spatial autocorrelation method with the urban heat island index as the key parameter, hot spots with a 99 percent confidence level and a 95 percent confidence level were found within the urban area. A hot spot with 95 and 90 percent confidence level was identified outside the urban area. This spike in temperature for a particular region in the rural area is due to industry and the associated built-up area. The study also identified cold spots with a 90 percent confidence level within the rural area. However, cold spots with a 95 and 99 percent confidence level were not identified within the study area.</div>","PeriodicalId":46398,"journal":{"name":"Geodesy and Geodynamics","volume":"14 3","pages":"Pages 275-291"},"PeriodicalIF":2.4,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45774123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7