Journal of Geodetic Science最新文献_第2页

DinSAR coseismic deformation measurements of the Mw 8.3 Illapel earthquake (Chile) 智利8.3 Mw Illapel地震的DinSAR同震形变测量

IF 1.3

Journal of Geodetic Science Pub Date : 2023-01-01 DOI: 10.1515/jogs-2022-0154

Agustín Calvet, S. Balbarani, M. Gende

{"title":"DinSAR coseismic deformation measurements of the Mw 8.3 Illapel earthquake (Chile)","authors":"Agustín Calvet, S. Balbarani, M. Gende","doi":"10.1515/jogs-2022-0154","DOIUrl":"https://doi.org/10.1515/jogs-2022-0154","url":null,"abstract":"Abstract The beginning of radars goes back to the 1930s where its main boost was related to the second world war. Nowadays, the techniques associated with radars are focused around a vast variety of civil, geodetic, and military applications. The development of the synthetic aperture principle, in the 1950s and 1960s, gave birth to a lot of new applications, and together with the technological progress of the last decades, the technique of interferometry with synthetic aperture radar (SAR) data became one of the most powerful ones for sensing remotely, with high quality and a vast spatial coverage. We used Sentinel-1 data and the differential interferometry SAR (DinSAR) technique to map and measure the surface deformation related to the 2015 Mw 8.3 Illapel earthquake (Chile). We also validated the results, by analysing the temporal variation of coordinates acquired from global navigation satellite system observations and projecting them in the geometry of the SAR system. Using this application we prove the DinSAR technique to be useful and powerful for the observation and analysis of surface deformation caused by the release of stress during the Mw 8.3 Illapel earthquake. It proved to be an efficient tool to detect and map the surface deformation with high spatial resolution in an approximate area of 20,000 km2.","PeriodicalId":44569,"journal":{"name":"Journal of Geodetic Science","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86145335","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}

引用次数: 0

A detailed quasigeoid model of the Hong Kong territories computed by applying a finite-element method of solving the oblique derivative boundary-value problem 用求解斜导数边值问题的有限元方法计算香港地区的详细拟曲面模型

IF 1.3

Journal of Geodetic Science Pub Date : 2023-01-01 DOI: 10.1515/jogs-2022-0153

R. Cunderlík, R. Tenzer, M. Macák, P. Zahorec, J. Papčo, Albertini Nsiah Ababio

{"title":"A detailed quasigeoid model of the Hong Kong territories computed by applying a finite-element method of solving the oblique derivative boundary-value problem","authors":"R. Cunderlík, R. Tenzer, M. Macák, P. Zahorec, J. Papčo, Albertini Nsiah Ababio","doi":"10.1515/jogs-2022-0153","DOIUrl":"https://doi.org/10.1515/jogs-2022-0153","url":null,"abstract":"Abstract New gravity and precise levelling measurements have been performed throughout the Hong Kong territories to modernize a vertical geodetic datum that is currently realized by heights of levelling benchmarks defined in the Hong Kong Principal Datum (HKPD). Modernization of the HKPD involved delivering various products, including new detailed geoid and quasigeoid models and newly determined orthometric and normal heights of levelling benchmarks. In this study, we present the result of gravimetric quasigeoid modelling. The method used to compute a detailed gravimetric quasigeoid model is based on the finite-element method to solve the geodetic boundary-value problem with oblique derivative boundary conditions considered directly at computational nodes on the discretized Earth’s topography. The result of a gravimetric quasigeoid modelling shows a good agreement with a geometric quasigeoid model at the Global Navigation Satellite System (GNSS)-levelling benchmarks. The standard deviation of differences between the gravimetric and geometric quasigeoid heights of ±3.3 cm is compatible with the expected accuracy of gravity, levelling, and GNSS measurements.","PeriodicalId":44569,"journal":{"name":"Journal of Geodetic Science","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86344860","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}

引用次数: 0

Accurate computation of geoid-quasigeoid separation in mountainous region – A case study in Colorado with full extension to the experimental geoid region 山区大地水准面-准大地水准面分离的精确计算——以科罗拉多州为例，并全面扩展到实验大地水准面区域

IF 1.3

Journal of Geodetic Science Pub Date : 2023-01-01 DOI: 10.1515/jogs-2022-0128

Y. M. Wang, M. Véronneau, Jianliang Huang, K. Ahlgren, J. Krcmaric, Xiaopeng Li, D. Avalos-Naranjo

{"title":"Accurate computation of geoid-quasigeoid separation in mountainous region – A case study in Colorado with full extension to the experimental geoid region","authors":"Y. M. Wang, M. Véronneau, Jianliang Huang, K. Ahlgren, J. Krcmaric, Xiaopeng Li, D. Avalos-Naranjo","doi":"10.1515/jogs-2022-0128","DOIUrl":"https://doi.org/10.1515/jogs-2022-0128","url":null,"abstract":"Abstract The geoid-quasigeoid separation (GQS) traditionally uses the Bouguer anomalies to approximate the difference between the mean gravity and normal gravity along the plumb line. This approximation is adequate in flat and low elevation areas, but not in high and rugged mountains. To increase the accuracy, higher order terms of the corrections (potential and gravity gradient) to the approximation were computed in Colorado where the 1 cm geoid computation experiment was conducted. Over an area of 730 km by 560 km where the elevation ranges between 932 and 4,385 m, the potential correction (Pot. Corr.) reaches −0.190 m and its root mean square (RMS) is 0.019 m. The gravity gradient correction is small but has high variation: the RMS of the correction is merely 0.003 m but varies from −0.025 to 0.020 m. In addition, the difference between the Bouguer gravity anomaly and gravity disturbance causes about a 0.01 m bias and a maximum correction of 0.02 m. The total corrections range from −0.135 to 0.180 m, with an RMS value of 0.019 m for the region. The magnitude of the corrections is large enough and is not negligible considering today’s cm-geoid requirement. After the test in Colorado, the complete GQS term is computed in 1′ × 1′ grids for the experimental geoid 2020 (xGEOID20), which covers a region bordered by latitude 0–85° north, longitude 180–350° east. Over the land areas, the RMS of the GQS is 0.119 m and the maximum reaches 1.3 m. The RMS of the GQS increases with respect to the height until 4,000 m, then decreases unexpectedly. At the highest peaks (5,500–6,000 m) of Denali and Mount Logan, the RMS of the GQS ranges between 0.08 and 0.189 m. The small GQS at these high peaks are caused by steep slopes around the peaks that produce large Pot. Corr. caused by the topography. In addition, the higher order correction terms reach half of a meter in those peaks.","PeriodicalId":44569,"journal":{"name":"Journal of Geodetic Science","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75694895","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}

引用次数: 1

On the connection of the Ecuadorian Vertical Datum to the IHRS 厄瓜多尔垂直基准面与IHRS的联系

IF 1.3

Journal of Geodetic Science Pub Date : 2023-01-01 DOI: 10.1515/jogs-2022-0151

J. L. Carrión, Sílvio R. Correia de Freitas, R. Barzaghi

引用次数: 0

Metrica – An application for collecting and navigating to geodetic control network points. Part II: Practical verification 一个用于收集和导航到大地测量控制网点的应用程序。第二部分:实际验证

IF 1.3

Journal of Geodetic Science Pub Date : 2023-01-01 DOI: 10.1515/jogs-2022-0147

Anna Przewięźlikowska, Wioletta Ślusarczyk, Klaudia Wójcik, K. Maciuk

引用次数: 0

Physical Geodesy by Martin Vermeer published by Aalto University Press 2020 马丁·维米尔的《物理大地测量学》，阿尔托大学出版社2020年出版

IF 1.3

Journal of Geodetic Science Pub Date : 2023-01-01 DOI: 10.1515/jogs-2022-0150

M. Eshagh

引用次数: 0

A first step towards a national realisation of the international height reference system in Sweden with a comparison to RH 2000 瑞典朝着实现国际高度参考系统迈出的第一步，并与2000年的RH进行了比较

Journal of Geodetic Science Pub Date : 2023-01-01 DOI: 10.1515/jogs-2022-0156

Anders Alfredsson, Jonas Ågren

{"title":"A first step towards a national realisation of the international height reference system in Sweden with a comparison to RH 2000","authors":"Anders Alfredsson, Jonas Ågren","doi":"10.1515/jogs-2022-0156","DOIUrl":"https://doi.org/10.1515/jogs-2022-0156","url":null,"abstract":"Abstract The International Height Reference System (IHRS) was defined by the International Association of Geodesy in 2015. Since then, the international geodetic community has been working on the specification and establishment of its realisation, the International Height Reference Frame (IHRF). This frame will primarily be realised by geopotential numbers (or physical heights) in a sparse global reference network. In Sweden, only one such global station is planned. Regional and national realisations (or densifications) computed in accordance with the IHRS definition are needed to enable the best possible unification of height datums. The main purpose of this article is to make a case study for Sweden regarding the national realisation of IHRS and to investigate in what way preliminary IHRF differs from the current Swedish levelling-based realisation of the European Vertical Reference System, RH 2000. The two different quasigeoid models that we consider best over Sweden at the present time are used to compute the preliminary IHRS realisations in the study. The realisations are compared to each other and to RH 2000. It is shown that a very significant part of the difference to RH 2000 is due to the different postglacial land uplift epochs, permanent tide concepts, and zero levels. The standard deviation for the difference between one of the preliminary national IHRS realisations and RH 2000 is reduced from 75.5 to 19.2 mm after correction of the postglacial land uplift and permanent tide effects. The corresponding mean differences are –208.5 and –454.7 mm, respectively. The magnitude of the mean difference thus increases when the corrections in question are applied.","PeriodicalId":44569,"journal":{"name":"Journal of Geodetic Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135595136","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}

引用次数: 0

Two adjustments of the second levelling of Finland by using nonconventional weights 芬兰用非常规的砝码对第二名进行了两次调整

IF 1.3

Journal of Geodetic Science Pub Date : 2023-01-01 DOI: 10.1515/jogs-2022-0148

Vasil Cvetkov

{"title":"Two adjustments of the second levelling of Finland by using nonconventional weights","authors":"Vasil Cvetkov","doi":"10.1515/jogs-2022-0148","DOIUrl":"https://doi.org/10.1515/jogs-2022-0148","url":null,"abstract":"Abstract Despite being in use for more than 150 years, the error accumulation in precise levelling has not yet been completely clarified. It is believed that the error accumulation in this method is proportional to the square root of the levelling length. The first goal of this article is to demonstrate that this belief is not always scientifically proven. The second aim is to show that it is likely that a better adjustment decision will be missed if inverse distance weighting with a power parameter equal to one is automatically applied. Using linear regression analysis the measuring data of the Second Levelling of Finland is analysed. An inadequacy of the relationship between the absolute values of the differences between both measurements of the elevations in the levelling lines and their length is shown, which is due to heteroscedasticity. In order to obtain a homoscedastic model, the other two models are constructed. Based on the regression analysis results, the network is adjusted using three types of weights. The adjustment with traditional weights has produced significantly greater mean errors of the nodal benchmarks than both variants based on weights, which are functions of the absolute values of the line elevations.","PeriodicalId":44569,"journal":{"name":"Journal of Geodetic Science","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87079429","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}

引用次数: 2

NKG2020 transformation: An updated transformation between dynamic and static reference frames in the Nordic and Baltic countries NKG2020转型:北欧和波罗的海国家动态和静态参考框架之间的最新转型

IF 1.3

Journal of Geodetic Science Pub Date : 2023-01-01 DOI: 10.1515/jogs-2022-0155

P. Häkli, Kristian Evers, L. Jivall, T. Nilsson, Sveinung Himle, K. Kollo, I. Liepiņš, E. Paršeliūnas, Olav Vestøl, M. Lidberg

{"title":"NKG2020 transformation: An updated transformation between dynamic and static reference frames in the Nordic and Baltic countries","authors":"P. Häkli, Kristian Evers, L. Jivall, T. Nilsson, Sveinung Himle, K. Kollo, I. Liepiņš, E. Paršeliūnas, Olav Vestøl, M. Lidberg","doi":"10.1515/jogs-2022-0155","DOIUrl":"https://doi.org/10.1515/jogs-2022-0155","url":null,"abstract":"Abstract Coordinates in global reference frames are becoming more and more common in positioning whereas most of the geospatial data are stored in registries in national reference frames. It is therefore essential to know the relation between global and national coordinates, i.e., the transformation, as accurately as possible. Officially provided pan-European transformations do not account for the special conditions in the Nordic and Baltic countries, namely crustal deformations caused by Glacial Isostatic Adjustment. Therefore, they do not fulfill the demands for the most accurate applications like long-term reference frame maintenance. Consequently, the Nordic Geodetic Commission (NKG) has developed customized and accurate transformations from the global ITRF to the national ETRS89 realizations for the Nordic and Baltic countries. We present the latest update, called the NKG2020 transformation, with several improvements and uncertainty estimates. We also discuss its significance and practical implementation for geodetic and geospatial communities.","PeriodicalId":44569,"journal":{"name":"Journal of Geodetic Science","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89895066","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}

引用次数: 0

Historical development of SIRGAS SIRGAS的历史发展

IF 1.3

Journal of Geodetic Science Pub Date : 2022-01-01 DOI: 10.1515/jogs-2022-0137

H. Drewes

{"title":"Historical development of SIRGAS","authors":"H. Drewes","doi":"10.1515/jogs-2022-0137","DOIUrl":"https://doi.org/10.1515/jogs-2022-0137","url":null,"abstract":"Abstract The Geodetic Reference System for the Americas (Sistema de Referencia Geodésico para las Américas, SIRGAS) was initiated in 1993 for South America at an international conference organised by the International Association of Geodesy (IAG), the Pan-American Institute for Geography and History (PAIGH), the Deutsches Geodätisches Forschungsinstitut (DGFI), and the U.S. Defense Mapping Agency (DMA) in Asunción, Paraguay. The corresponding South American reference network was observed in 1995 by a ten-day GPS campaign at 58 stations. The network was extended to Central and North America in 2000 and immediately afterwards converted to a frame of continuously observing GNSS stations instead of short-term campaigns. The linear station position changes (velocities) were estimated by a multi-year least squares adjustment of weekly solutions, the first being published in 2002. The total set of station velocities served for the computation of continuous surface deformation models, the first over South America was published in 2005. Today, SIRGAS is accepted by most of the American states as the official geodetic reference frame. Besides the product generation (station positions, velocities, and surface deformation), SIRGAS is active in education and training offering schools and workshops for students, surveyors, and other stakeholders.","PeriodicalId":44569,"journal":{"name":"Journal of Geodetic Science","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79762711","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}

引用次数: 0