Pub Date : 2024-02-20DOI: 10.22389/0016-7126-2024-1003-1-2-13
N. Bovshin
In this paper, we continue to study the geodetic stations adjusted coordinates’ statistical properties in permanently operated networks. Analytical reconstructing the variance-covariance matrix of a real vector solution obtained from processing a redundant set of the same GNSS observation session’s measured vectors is performed. The mentioned matrix is compared with the same one, of the vector solution, resulted on the measured lines’ total set basis. Common properties of both arrays are revealed, as well as discrepancies in features for different types of solutions. As a suitable tool for studying the latter, the corresponding absolute way is offered
{"title":"Analysis of the properties of regional geodetic GNSS networks built by the relative method. General case","authors":"N. Bovshin","doi":"10.22389/0016-7126-2024-1003-1-2-13","DOIUrl":"https://doi.org/10.22389/0016-7126-2024-1003-1-2-13","url":null,"abstract":"\u0000In this paper, we continue to study the geodetic stations adjusted coordinates’ statistical properties in permanently operated networks. Analytical reconstructing the variance-covariance matrix of a real vector solution obtained from processing a redundant set of the same GNSS observation session’s measured vectors is performed. The mentioned matrix is compared with the same one, of the vector solution, resulted on the measured lines’ total set basis. Common properties of both arrays are revealed, as well as discrepancies in features for different types of solutions. As a suitable tool for studying the latter, the corresponding absolute way is offered\u0000","PeriodicalId":44129,"journal":{"name":"Geodesy and Cartography","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139958337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-20DOI: 10.22389/0016-7126-2024-1003-1-33-42
Y.R. Polyakova, S. Merkushev
The approaches to studying the attractiveness of pedestrian spaces are proposed, which could in the researchers’ opinion serve as one of the urban environment quality indicators. Based on the authors` methodology with the help of geographic information technologies, an assessment of the attractiveness of Perm’s large center pedestrian spaces’ most consolidated components was carried out. To form an array of the data (attractor objects), open sources were used. Attribute values which enabled analyzing the direct location of attractors were the proximity and belonging to the components of the pedestrian spaces chosen as the subject of the study. As a result of the vector data spatial analysis, noticeable differences in the attractiveness of those places were revealed. Its highest index is typical for the embankment of the Kama. The result is slightly lower near the esplanade and foot zones near the railway station Perm-2. The lowest level was found in the mentioned spaces located near the southern and eastern outskirts of the large center. The authors analyze the features and problems of using publicly available data, propose measures to increase the attractiveness of the central pedestrian spaces of Perm, and conclude that it is necessary to form a unified space to gather and swap information in order to increase the effectiveness of further local studies of the environmental quality
{"title":"Evaluation of Perm’s large center pedestrian zones segments attractiveness using geographic information technologies","authors":"Y.R. Polyakova, S. Merkushev","doi":"10.22389/0016-7126-2024-1003-1-33-42","DOIUrl":"https://doi.org/10.22389/0016-7126-2024-1003-1-33-42","url":null,"abstract":"\u0000The approaches to studying the attractiveness of pedestrian spaces are proposed, which could in the researchers’ opinion serve as one of the urban environment quality indicators. Based on the authors` methodology with the help of geographic information technologies, an assessment of the attractiveness of Perm’s large center pedestrian spaces’ most consolidated components was carried out. To form an array of the data (attractor objects), open sources were used. Attribute values which enabled analyzing the direct location of attractors were the proximity and belonging to the components of the pedestrian spaces chosen as the subject of the study. As a result of the vector data spatial analysis, noticeable differences in the attractiveness of those places were revealed. Its highest index is typical for the embankment of the Kama. The result is slightly lower near the esplanade and foot zones near the railway station Perm-2. The lowest level was found in the mentioned spaces located near the southern and eastern outskirts of the large center. The authors analyze the features and problems of using publicly available data, propose measures to increase the attractiveness of the central pedestrian spaces of Perm, and conclude that it is necessary to form a unified space to gather and swap information in order to increase the effectiveness of further local studies of the environmental quality\u0000","PeriodicalId":44129,"journal":{"name":"Geodesy and Cartography","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139958299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-20DOI: 10.22389/0016-7126-2024-1003-1-43-51
Aleksey Romanchikov, T. Baltyzhakova, V.V. Belyaev
The authors propose a method for evaluating the public transport accessibility of a city, based on the spatial distribution of real estate and commercial property in its territory, it enables making a rating table of routes and stops. The relevance of the study is related to the high social importance of mass transit, since its accessibility creates a more comfortable urban environment and offers new opportunities to the residents. The significant growth of research on this topic is a result of the social need to improve the use of urban space. The rapid development in the field of big data processing makes it much more relevant to the real situation than any previous models. However, researchers often lack up-to-date information on the distribution of the population in a given territory, because the concept of state open spatial data in Russia is currently in its early stages, and city authorities may decide to make it confidential. The proposed quantitative approach to assessing the provision of urban areas with land transportation means is based on using spatial data available in open sources, as well as methods of geospatial analysis and modelling. It is used to study the public transport in St. Petersburg, RF; the technique has enabled identifying the main municipal routes as well as the parts of the city requiring network expansion
{"title":"Evaluation of public land transport accessibility in St. Petersburg, Russia, using a geospatial approach","authors":"Aleksey Romanchikov, T. Baltyzhakova, V.V. Belyaev","doi":"10.22389/0016-7126-2024-1003-1-43-51","DOIUrl":"https://doi.org/10.22389/0016-7126-2024-1003-1-43-51","url":null,"abstract":"\u0000The authors propose a method for evaluating the public transport accessibility of a city, based on the spatial distribution of real estate and commercial property in its territory, it enables making a rating table of routes and stops. The relevance of the study is related to the high social importance of mass transit, since its accessibility creates a more comfortable urban environment and offers new opportunities to the residents. The significant growth of research on this topic is a result of the social need to improve the use of urban space. The rapid development in the field of big data processing makes it much more relevant to the real situation than any previous models. However, researchers often lack up-to-date information on the distribution of the population in a given territory, because the concept of state open spatial data in Russia is currently in its early stages, and city authorities may decide to make it confidential. The proposed quantitative approach to assessing the provision of urban areas with land transportation means is based on using spatial data available in open sources, as well as methods of geospatial analysis and modelling. It is used to study the public transport in St. Petersburg, RF; the technique has enabled identifying the main municipal routes as well as the parts of the city requiring network expansion\u0000","PeriodicalId":44129,"journal":{"name":"Geodesy and Cartography","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139957913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The European Commission (EC) originally proposed ideas for a European Galileo satellite navigation system in 1999. A four-phase development is planned, involving investment from both the public and commercial sectors. Galileo is intended for both public and government use; the system is administered and operated by civil administration. Galileo will consist of a constellation of 30 satellites, a number of globally situated ground stations, and a ground control and monitoring system – all of which are quite similar to the structure, format, and layout of GPS. This document discusses an experiment at the project site that used the static approach to integrate GPS, GLONASS, GALILEO, Beidou, and QZSS signals. This research analyses the possible precision of GPS-only and GPS/GLONASS/GALILEO/Beidou/QZSS. These results suggest that combining a GPS system with GALILEO, GLONASS Beidou, and QZSS is preferable for surveying purposes. Integrating GPS/GLONASS/GALILEO/Beidou/QZSS static measurements in the study region with 0–120 millimetre accuracy looks to be possible in three days.
{"title":"TESTING THE CONTRIBUTION, ACCURACY AND PERFORMANCE OF MGEX (GNSS (GPS+GLONASS+GALILEO+BEIDOU+QZSS)) POSITIONING IN THE STUDY REGION","authors":"A. Pırtı","doi":"10.3846/gac.2023.17707","DOIUrl":"https://doi.org/10.3846/gac.2023.17707","url":null,"abstract":"The European Commission (EC) originally proposed ideas for a European Galileo satellite navigation system in 1999. A four-phase development is planned, involving investment from both the public and commercial sectors. Galileo is intended for both public and government use; the system is administered and operated by civil administration. Galileo will consist of a constellation of 30 satellites, a number of globally situated ground stations, and a ground control and monitoring system – all of which are quite similar to the structure, format, and layout of GPS. This document discusses an experiment at the project site that used the static approach to integrate GPS, GLONASS, GALILEO, Beidou, and QZSS signals. This research analyses the possible precision of GPS-only and GPS/GLONASS/GALILEO/Beidou/QZSS. These results suggest that combining a GPS system with GALILEO, GLONASS Beidou, and QZSS is preferable for surveying purposes. Integrating GPS/GLONASS/GALILEO/Beidou/QZSS static measurements in the study region with 0–120 millimetre accuracy looks to be possible in three days.","PeriodicalId":44129,"journal":{"name":"Geodesy and Cartography","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138948578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
DEM can be used optimally when it has good accuracy. Thus, assessing DEM data quality is mandatory before use it for specific thematic applications. Recently, there are open-source DEM data that can be downloaded and used freely by users, such as SRTM and ASTER GDEM. However, Indonesia tried to develop their own national seamless DEM, called DEMNAS. This study aims to evaluate the open-source DEMs that are popular in Indonesia: DEMNAS, SRTM-1, and ASTER GDEM. Accuracy assessment was conducted by comparing the DEMs to GPS measurements. The results showed that SRTM-1 had the best accuracy with 5.529 meters, followed by DEMNAS and ASTER GDEM with 8.172 meters and 13.632 meters, respectively. We also analyzed the linear relation between DEMs and GPS elevation data using the coefficient of determination, and all DEMs showed good R2 values. Lastly, the correlation between the error and the height of DEMs was also examined. The results were SRTM-1 had correlation between the height and accuracy, as well as ASTER GDEM. In contrast, the errors in DEMNAS were relatively uniform in all range of elevation.
如果 DEM 具有良好的精度，就能得到最佳利用。因此，在将 DEM 数据用于特定专题应用之前，必须对其质量进行评估。最近，有一些开放源码的 DEM 数据可供用户免费下载和使用，如 SRTM 和 ASTER GDEM。不过，印度尼西亚试图开发自己的国家无缝 DEM，即 DEMNAS。本研究旨在评估印尼流行的开放源码 DEM：DEMNAS、SRTM-1 和 ASTER GDEM。通过将 DEM 与 GPS 测量结果进行比较，对精度进行了评估。结果显示，SRTM-1 的精度最高，为 5.529 米，其次是 DEMNAS 和 ASTER GDEM，分别为 8.172 米和 13.632 米。我们还利用判定系数分析了 DEM 与 GPS 高程数据之间的线性关系，所有 DEM 都显示出良好的 R2 值。最后，我们还研究了 DEM 误差与高度之间的相关性。结果表明，SRTM-1 和 ASTER GDEM 的高度与精度之间具有相关性。相比之下，DEMNAS 的误差在所有高度范围内都相对均匀。
{"title":"VERTICAL ACCURACY ASSESSMENT OF VARIOUS OPEN-SOURCE DEM DATA: DEMNAS, SRTM-1, AND ASTER GDEM","authors":"D. B. Susetyo","doi":"10.3846/gac.2023.18168","DOIUrl":"https://doi.org/10.3846/gac.2023.18168","url":null,"abstract":"DEM can be used optimally when it has good accuracy. Thus, assessing DEM data quality is mandatory before use it for specific thematic applications. Recently, there are open-source DEM data that can be downloaded and used freely by users, such as SRTM and ASTER GDEM. However, Indonesia tried to develop their own national seamless DEM, called DEMNAS. This study aims to evaluate the open-source DEMs that are popular in Indonesia: DEMNAS, SRTM-1, and ASTER GDEM. Accuracy assessment was conducted by comparing the DEMs to GPS measurements. The results showed that SRTM-1 had the best accuracy with 5.529 meters, followed by DEMNAS and ASTER GDEM with 8.172 meters and 13.632 meters, respectively. We also analyzed the linear relation between DEMs and GPS elevation data using the coefficient of determination, and all DEMs showed good R2 values. Lastly, the correlation between the error and the height of DEMs was also examined. The results were SRTM-1 had correlation between the height and accuracy, as well as ASTER GDEM. In contrast, the errors in DEMNAS were relatively uniform in all range of elevation.","PeriodicalId":44129,"journal":{"name":"Geodesy and Cartography","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138955863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Odumosu, V. C. Nnam, O. Kemiki, Abdulkadir Abubarkar, Michael A. Oyebanji, Sunday O. Babalola
The need for the adoption of systematic land titling (SLT) in Nigeria cannot be overemphasised. Nonetheless, the problems of speed and cost of geospatial data acquisition, as well as identification of non-surveyed boundaries, remain unresolved, impeding the effectiveness of SLT for non-surveyed boundaries. The integration of language into Artificial Intelligence (AI) has allowed Natural Language Parsing (NLP) to effectively serve as a tool for communication between humans and computer systems. This study presents preliminary results of testing a prototype application that utilises NLP to convert textual descriptions into graphic sketches as a tool towards the production of a-priori sketches that can aid SLT in non-surveyed boundaries. The study determines that NLP alone cannot be used to achieve the required accuracy in geospatial data for SLT; however, the study concludes that NLP can be integrated alongside other ancillary information to enhance SLT in peri-urban regions.
{"title":"APPLICATION OF NATURAL LANGUAGE PARSING FOR IDENTIFYING NON-SURVEYED BOUNDARIES TOWARDS ENHANCED SYSTEMATIC LAND TITLING: RESULTS FROM PRELIMINARY EXPERIMENT","authors":"J. Odumosu, V. C. Nnam, O. Kemiki, Abdulkadir Abubarkar, Michael A. Oyebanji, Sunday O. Babalola","doi":"10.3846/gac.2023.18111","DOIUrl":"https://doi.org/10.3846/gac.2023.18111","url":null,"abstract":"The need for the adoption of systematic land titling (SLT) in Nigeria cannot be overemphasised. Nonetheless, the problems of speed and cost of geospatial data acquisition, as well as identification of non-surveyed boundaries, remain unresolved, impeding the effectiveness of SLT for non-surveyed boundaries. The integration of language into Artificial Intelligence (AI) has allowed Natural Language Parsing (NLP) to effectively serve as a tool for communication between humans and computer systems. This study presents preliminary results of testing a prototype application that utilises NLP to convert textual descriptions into graphic sketches as a tool towards the production of a-priori sketches that can aid SLT in non-surveyed boundaries. The study determines that NLP alone cannot be used to achieve the required accuracy in geospatial data for SLT; however, the study concludes that NLP can be integrated alongside other ancillary information to enhance SLT in peri-urban regions.","PeriodicalId":44129,"journal":{"name":"Geodesy and Cartography","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138994405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Pratomo, Rizka Amelia Dwi Safira, Olivia Stefani
The bottom surface’s portrayal is crucial in many different practices. Therefore, accurate bathymetry data is required. The interpolation method is one element that influences the accuracy of a Single Beam Echosounder’s depth data. IDW, Kriging, and TIN are three standard interpolation techniques. This study compares these three methods with two scenarios utilizing the spatial analysis to establish the most effective technique for producing the digital elevation model of the seafloor beneath Bawean Island. The IDW exhibits the strongest R-squared (0.9998779 in Scenario-1 and 0.9999875 in Scenario-2) and correlation (0.9998796 in Scenario-1 and 0.9999595 in Scenario-2). It indicates that IDW and bathymetric data have the closest relationships. IDW has the lowest error, as measured by the MAE value (0.02 in Scenario-1 and 0.009 in Scenario-2), followed in both cases by Kriging and TIN. Additionally, the RMSE for IDW shows the same outcome (0.045 in Scenario 1 and 0.016 in Scenario 2). In the meantime, comparing the first and second scenarios reveals that the second, which has fewer data, is preferable to the first. Since the MAE and RMSE in the first scenario are greater than those in the second, we may infer that more data leads to more significant errors.
底面的描绘在许多不同的实践中都至关重要。因此，需要精确的测深数据。插值方法是影响单波束回声测深仪深度数据准确性的因素之一。IDW、Kriging 和 TIN 是三种标准的插值技术。本研究将这三种方法与利用空间分析的两种方案进行比较，以确定制作巴威恩岛海底数字高程模型的最有效技术。IDW 显示出最强的 R 平方（方案 1 为 0.9998779，方案 2 为 0.9999875）和相关性（方案 1 为 0.9998796，方案 2 为 0.9999595）。这表明 IDW 和测深数据的关系最为密切。从 MAE 值来看，IDW 的误差最小（方案 1 为 0.02，方案 2 为 0.009），其次是克里金法和 TIN 法。此外，IDW 的 RMSE 也显示了相同的结果（方案 1 中为 0.045，方案 2 中为 0.016）。同时，比较第一种和第二种方案可以发现，数据较少的第二种方案优于第一种方案。由于第一种方案的 MAE 和 RMSE 大于第二种方案，我们可以推断数据越多，误差越大。
{"title":"A COMPARISON OF DIFFERENT GIS-BASED INTERPOLATION METHODS FOR BATHYMETRIC DATA: CASE STUDY OF BAWEAN ISLAND, EAST JAVA","authors":"D. Pratomo, Rizka Amelia Dwi Safira, Olivia Stefani","doi":"10.3846/gac.2023.18250","DOIUrl":"https://doi.org/10.3846/gac.2023.18250","url":null,"abstract":"The bottom surface’s portrayal is crucial in many different practices. Therefore, accurate bathymetry data is required. The interpolation method is one element that influences the accuracy of a Single Beam Echosounder’s depth data. IDW, Kriging, and TIN are three standard interpolation techniques. This study compares these three methods with two scenarios utilizing the spatial analysis to establish the most effective technique for producing the digital elevation model of the seafloor beneath Bawean Island. The IDW exhibits the strongest R-squared (0.9998779 in Scenario-1 and 0.9999875 in Scenario-2) and correlation (0.9998796 in Scenario-1 and 0.9999595 in Scenario-2). It indicates that IDW and bathymetric data have the closest relationships. IDW has the lowest error, as measured by the MAE value (0.02 in Scenario-1 and 0.009 in Scenario-2), followed in both cases by Kriging and TIN. Additionally, the RMSE for IDW shows the same outcome (0.045 in Scenario 1 and 0.016 in Scenario 2). In the meantime, comparing the first and second scenarios reveals that the second, which has fewer data, is preferable to the first. Since the MAE and RMSE in the first scenario are greater than those in the second, we may infer that more data leads to more significant errors.","PeriodicalId":44129,"journal":{"name":"Geodesy and Cartography","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138959808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Turbidity is an important water quality parameter and an indicator of water pollution. Marine remote sensing techniques has become a useful tool for mapping of turbidity at coastal waters. The advantage of using remote sensing for water quality analysis is its ability to obtain synoptic data from the entire study area to produce continuous surface data, can shows detailed spatial variability and periodically. The empirical modeling has been applied in this study to formulate the mathematical relationship between coastal waters turbidity with Sentinel-2 reflectance. This study integrated field survey and image processing. Measurement of in-situ turbidity was done in accordance with imagery acquisition time. Imageries used for this study were Sentinel-2 level-2A. The mathematical relationship was obtained by multiple linear regression model between turbidity and Sentinel-2 reflectance. A mathematical model has been developed in Sentinel-2 imagery and successfully applied to obtain surface turbidity. Estimated turbidity derived from Sentinel-2 imagery is very close to observed turbidity so the proposed model can be used to retrieve turbidity of coastal waters.
{"title":"ESTIMATION OF COASTAL WATERS TURBIDITY USING SENTINEL-2 IMAGERY","authors":"Muhammad Anshar Amran, W. Daming","doi":"10.3846/gac.2023.18132","DOIUrl":"https://doi.org/10.3846/gac.2023.18132","url":null,"abstract":"Turbidity is an important water quality parameter and an indicator of water pollution. Marine remote sensing techniques has become a useful tool for mapping of turbidity at coastal waters. The advantage of using remote sensing for water quality analysis is its ability to obtain synoptic data from the entire study area to produce continuous surface data, can shows detailed spatial variability and periodically. The empirical modeling has been applied in this study to formulate the mathematical relationship between coastal waters turbidity with Sentinel-2 reflectance. This study integrated field survey and image processing. Measurement of in-situ turbidity was done in accordance with imagery acquisition time. Imageries used for this study were Sentinel-2 level-2A. The mathematical relationship was obtained by multiple linear regression model between turbidity and Sentinel-2 reflectance. A mathematical model has been developed in Sentinel-2 imagery and successfully applied to obtain surface turbidity. Estimated turbidity derived from Sentinel-2 imagery is very close to observed turbidity so the proposed model can be used to retrieve turbidity of coastal waters.","PeriodicalId":44129,"journal":{"name":"Geodesy and Cartography","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138960159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The 2014 North Aegean Sea earthquake was a strong (Mw 6.9) event that caused significant crustal deformations. In the present study we investigate the long-term impact of the earthquake on the kinematics of the North Aegean Trough (NAT). For this purpose, we analyzed GPS observations collected from May 2010 to April 2022 at five permanent GPS reference stations. Two of these stations are located close to the epicenter(s) on the Islands of Lemnos and Samothrace. We processed the data using the Precise Point Positioning (PPP) technique. The analysis of the obtained coordinate time-series revealed a post-seismic deformation (PSD) period lasting for more than two years leading to cumulative 2D post-seismic displacement of 22 mm and 27 mm for Samothrace and Lemnos, respectively. The magnitudes of these post-seismic slip vectors correspond to 23% and 49% of the co-seismic vectors at Samothrace and Lemnos, respectively. The long-term analysis showed that after the end of the PSD period the stations are characterized by stable velocities that are noticeably different compared to the velocities prior to the event. We observed a change in the velocity in the order of 2 mm/yr for both Samothrace and Lemnos. It is the first time that PSD and velocity changes have been reported for the 2014 North Aegean Sea earthquake shedding light on the characteristics and the impact of this important earthquake on the kinematics of NAT.
{"title":"GEODETIC EVIDENCE FOR POST-SEISMIC DEFORMATIONS FOLLOWING THE 2014 NORTH AEGEAN MW 6.9 EARTHQUAKE","authors":"M. Gianniou, P. Argyrakis, Tatiani Prasinou","doi":"10.3846/gac.2023.19369","DOIUrl":"https://doi.org/10.3846/gac.2023.19369","url":null,"abstract":"The 2014 North Aegean Sea earthquake was a strong (Mw 6.9) event that caused significant crustal deformations. In the present study we investigate the long-term impact of the earthquake on the kinematics of the North Aegean Trough (NAT). For this purpose, we analyzed GPS observations collected from May 2010 to April 2022 at five permanent GPS reference stations. Two of these stations are located close to the epicenter(s) on the Islands of Lemnos and Samothrace. We processed the data using the Precise Point Positioning (PPP) technique. The analysis of the obtained coordinate time-series revealed a post-seismic deformation (PSD) period lasting for more than two years leading to cumulative 2D post-seismic displacement of 22 mm and 27 mm for Samothrace and Lemnos, respectively. The magnitudes of these post-seismic slip vectors correspond to 23% and 49% of the co-seismic vectors at Samothrace and Lemnos, respectively. The long-term analysis showed that after the end of the PSD period the stations are characterized by stable velocities that are noticeably different compared to the velocities prior to the event. We observed a change in the velocity in the order of 2 mm/yr for both Samothrace and Lemnos. It is the first time that PSD and velocity changes have been reported for the 2014 North Aegean Sea earthquake shedding light on the characteristics and the impact of this important earthquake on the kinematics of NAT.","PeriodicalId":44129,"journal":{"name":"Geodesy and Cartography","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138960589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
: This article applies radar interferometry technologies implemented in the ENVI SARscape and SNAP software environment provided by the processing of data from the Sentinel-1 satellite. The study was carried out based on six radar images of Sentinel-1A and Sentinel -1B taken from September 2017 until February 2018 with an interval of one month and on the radar-module of the already mentioned SNAP software. The main input data for solving the considered problem are radar images received from the satellite Sentinel-1B on the territory of Stebnyk-Truskavets for six months with an interval of one month. Monitoring of the Earth’s surface using radar data of the Sentinel-1A with a synthesized aperture is implemented with the application of interferometric methods of Persistent Scatterers and Small baselines interferometry for estimating small displacements of the Earth’s surface and structures. The obtained quantitative and qualitative indicators of monitoring do not answer the processes that take place and lead to vertical displacements the six months but do provide an opportunity to assess the extent and trends of their development. The specification in each case can be accomplished by ground methods, which greatly simplify the search for sites with critical parameters of vertical displacements which can have negative consequences and lead to an emergency.
{"title":"Monitoring of displacements and deformations of the earth’s surface near the Stebnyk city using radar images of Sentinel-1","authors":"Ihor Trevoho, Borys Chetverikov, Lubov Babiy, Mariia Malanchuk","doi":"10.24425/gac.2020.131079","DOIUrl":"https://doi.org/10.24425/gac.2020.131079","url":null,"abstract":": This article applies radar interferometry technologies implemented in the ENVI SARscape and SNAP software environment provided by the processing of data from the Sentinel-1 satellite. The study was carried out based on six radar images of Sentinel-1A and Sentinel -1B taken from September 2017 until February 2018 with an interval of one month and on the radar-module of the already mentioned SNAP software. The main input data for solving the considered problem are radar images received from the satellite Sentinel-1B on the territory of Stebnyk-Truskavets for six months with an interval of one month. Monitoring of the Earth’s surface using radar data of the Sentinel-1A with a synthesized aperture is implemented with the application of interferometric methods of Persistent Scatterers and Small baselines interferometry for estimating small displacements of the Earth’s surface and structures. The obtained quantitative and qualitative indicators of monitoring do not answer the processes that take place and lead to vertical displacements the six months but do provide an opportunity to assess the extent and trends of their development. The specification in each case can be accomplished by ground methods, which greatly simplify the search for sites with critical parameters of vertical displacements which can have negative consequences and lead to an emergency.","PeriodicalId":44129,"journal":{"name":"Geodesy and Cartography","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135545538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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