Geodesy and cartography最新文献_第3页

Looking for the global minimum of the objective function to determine the pseudoinverse matrix through the search method at equalizing free geodesic networks 在均衡自由大地网中通过搜索法寻找目标函数的全局最小值以确定伪逆矩阵

Geodesy and cartography Pub Date : 2024-03-20 DOI: 10.22389/0016-7126-2024-1004-2-31-41

G.G. Shevshenko, N.A. Naumova, M. Bryn

{"title":"Looking for the global minimum of the objective function to determine the pseudoinverse matrix through the search method at equalizing free geodesic networks","authors":"G.G. Shevshenko, N.A. Naumova, M. Bryn","doi":"10.22389/0016-7126-2024-1004-2-31-41","DOIUrl":"https://doi.org/10.22389/0016-7126-2024-1004-2-31-41","url":null,"abstract":"\u0000When evaluating the accuracy of equalized free geodetic networks based on the search method of nonlinear programming, a degenerate matrix of unknowns’ normal equations coefficients is formed. It must be pseudoinverse in order to calculate the inverse weight one of the equalized parameters. Performing a mathematical procedure for calculating a pseudoinverse matrix based on the mentioned technology of nonlinear programming at equalizing free geodetic constructions, a situation may arise when the minimization step is incorrectly selected or the approximate values in the desired array of numbers are set roughly. It can lead to finding a local, not a global minimum, as well as to cycling the algorithm. The authors provide the conclusion of the formula and substantiate the conditions on which the elements of the required matrix change, so that the value of the objective function either comes as close as possible to the global minimum, or indicates that it is impossible to achieve it. The correctness of the proposed conditions and the derived formula are confirmed by a test example\u0000","PeriodicalId":502308,"journal":{"name":"Geodesy and cartography","volume":" 33","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140388326","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

Algorithm of land surface points extraction from airborne laser scanning data 从机载激光扫描数据中提取地表点的算法

Geodesy and cartography Pub Date : 2024-03-20 DOI: 10.22389/0016-7126-2024-1004-2-2-11

M. Vystrchil, T. Baltyzhakova, Aleksey Romanchikov, A.A. Bogolyubova

引用次数: 0

Assessment of the state protective forest areas condition in the Saratov oblast based on remote sensing data and GIS technologies 基于遥感数据和 GIS 技术的萨拉托夫州国家防护林区状况评估

Geodesy and cartography Pub Date : 2024-03-20 DOI: 10.22389/0016-7126-2024-1004-2-42-50

A.A. Vypritsky

引用次数: 0

Results of determining the geoid height profile and vertical line deviation using GNSS signals reflected from water surface 利用水面反射的全球导航卫星系统信号确定大地水准面高度剖面和垂直线偏差的结果

Geodesy and cartography Pub Date : 2024-03-20 DOI: 10.22389/0016-7126-2024-1004-2-21-30

V. Lopatin, M. Murzabekov, D.S. Bobrov

引用次数: 0

Compatibility assessment of the reference frames orbital realizations broadcasted by the global navigation satellite systems with the International terrestrial reference frame (ITRF) during 2020–2023 2020-2023 年期间全球导航卫星系统广播的参考框架轨道实现与国际地面参考框架（ITRF）的兼容性评估

Geodesy and cartography Pub Date : 2024-03-20 DOI: 10.22389/0016-7126-2024-1004-2-51-64

I.V. Gusev, A.M. Golubitskiy

{"title":"Compatibility assessment of the reference frames orbital realizations broadcasted by the global navigation satellite systems with the International terrestrial reference frame (ITRF) during 2020–2023","authors":"I.V. Gusev, A.M. Golubitskiy","doi":"10.22389/0016-7126-2024-1004-2-51-64","DOIUrl":"https://doi.org/10.22389/0016-7126-2024-1004-2-51-64","url":null,"abstract":"\u0000The compatibility assessment of the terrestrial reference frames orbital realizations broadcasted by the global navigation satellite systems (GPS, GLONASS, Galileo and BeiDou) with the International terrestrial reference frame ITRF during 2020–2023 was performed. The assessment is based on the analysis of daily Helmert transformation parameters determined in the Information and Analysis Center for Positioning, Navigation and Timing of the Central Research Institute for Machine Building within calculating a posteriori ephemeris and time information for each constellation. Based on the daily Helmert transformation parameters, annual reference frames coincidence parameters RSS7 and Λ and their standard deviations StDRSS7 and StDΛ on the monthly, 10-day and daily averaging intervals were computed, characterizing the stability of terrestrial reference frames orbital realizations. The obtained results show the following level of coincidence between the terrestrial reference frames broadcasted by global navigation satellite systems and ITRF\u0000","PeriodicalId":502308,"journal":{"name":"Geodesy and cartography","volume":" 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140388923","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

Line lengths comparison results on the spatial reference basis SGUGiT 空间参照基准 SGUGiT 的线长比较结果

Geodesy and cartography Pub Date : 2024-03-20 DOI: 10.22389/0016-7126-2024-1004-2-12-20

N.S. Kosarev, A.A. Sholomitskii, M.A. Khanzadyan, L. Serdakov, V.S. Krapivin, I.O. Suchkov

{"title":"Line lengths comparison results on the spatial reference basis SGUGiT","authors":"N.S. Kosarev, A.A. Sholomitskii, M.A. Khanzadyan, L. Serdakov, V.S. Krapivin, I.O. Suchkov","doi":"10.22389/0016-7126-2024-1004-2-12-20","DOIUrl":"https://doi.org/10.22389/0016-7126-2024-1004-2-12-20","url":null,"abstract":"\u0000The results of line lengths comparison on the spatial reference basis (SRB) of SGUGiT, carried out according to the program in all combinations measurements in the forward direction from point BI01 to point BI10 in spring and summer of 2021 and 2023 using total station Leica TM30, as well as, in the same seasons of 2023 done by laser tracker Leica AT403 are given. Based on the analysis of multiple measurements of each section of the basis (at least 30 ones), the standard deviation and uncertainty were calculated. Meanwhile, at the extreme points of the base section, meteorological parameters (temperature, pressure and relative humidity) were recorded by two independent instruments, which were then entered immediately when metering with a Leica TM 30 electronic total station. In the case of the Leica AT403 laser tracker, they were automatically taken into account in specialized software management and processing of Spatial Analyzer measurement data. Due to the research results, it was found out that the expanded uncertainty in measuring the lengths of the basic lines in the range from 12 to 192 m on the WPT using a Leica AT403 laser tracker and a Leica TM30 electronic total station, taking into account the accepted errors that affect the final result, is no more than 1,4 mm, and the maximum contribution to the mistake in determining line lengths is made by the standard uncertainty estimated by type B. In addition, seasonal fluctuations in the position of individual basis points are observed\u0000","PeriodicalId":502308,"journal":{"name":"Geodesy and cartography","volume":" 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140388723","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

Development of geospatial activities in Russia: strategic directions and priorities 俄罗斯地理空间活动的发展：战略方向和优先事项

Geodesy and cartography Pub Date : 2024-01-20 DOI: 10.22389/0016-7126-2023-1002-12-49-58

A. Karpik, D. Lisitsky, I. Musikhin

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Harmonic analysis of the earth`s surface points` horizontal movements in the ITRF ITRF 中地球表面点水平移动的谐波分析

Geodesy and cartography Pub Date : 2024-01-20 DOI: 10.22389/0016-7126-2023-1002-12-10-16

V. Popadyev

引用次数: 0

Results of astronomical leveling on the Moscow attraction using a zenith camera 使用天顶照相机对莫斯科景点进行天文测量的结果

Geodesy and cartography Pub Date : 2024-01-20 DOI: 10.22389/0016-7126-2023-1002-12-2-9

M. Murzabekov, V. F. Fateev, D.I. Pleshakov

{"title":"Results of astronomical leveling on the Moscow attraction using a zenith camera","authors":"M. Murzabekov, V. F. Fateev, D.I. Pleshakov","doi":"10.22389/0016-7126-2023-1002-12-2-9","DOIUrl":"https://doi.org/10.22389/0016-7126-2023-1002-12-2-9","url":null,"abstract":"\u0000In this paper, the quasi-geoid elevations along the profile of the Moscow attraction are calculated based on the astronomical leveling method – according to the components of the deflection of vertical, which were measured using the zenith camera of the FSUE \"VNIIF-TRI\". The length of the profile is approximately 93 km. The error in the final excess of the quasi-geoid for the attraction profile, obtained from the mentioned measurements, was about 13 mm. The results are compared with a digital model of quasi-geoid heights, which has a relative error of ~4 cm in the Moscow region. Juxtaposition of the quasi-geoid elevations gave an average difference of –1,8 cm and its standard deviation of 1,9 cm. The dependence of the quasi-geoid final excess for the attraction profile on the points’ number used (lengths of segments) and the measurement area anomaly were studied. For the Moscow attraction, which is a medium-anomalous region, it was found out that the optimal distance between surveyed points should not exceed 13 km. The method of astronomical leveling using a zenith camera can be used for metrological support and independent control of quasigeoid models obtained through other methods, for example, gravimetric ones\u0000","PeriodicalId":502308,"journal":{"name":"Geodesy and cartography","volume":"83 15","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139610947","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

Deformation analysis and visualization from GNSS observations in Python 3 and QGIS 3 利用 Python 3 和 QGIS 3 对全球导航卫星系统观测数据进行形变分析和可视化

Geodesy and cartography Pub Date : 2024-01-20 DOI: 10.22389/0016-7126-2023-1002-12-17-26

A. Manevich, R. Shevchuk, I. Losev, V. Kaftan, D. Urmanov, A.I. Shakirov

{"title":"Deformation analysis and visualization from GNSS observations in Python 3 and QGIS 3","authors":"A. Manevich, R. Shevchuk, I. Losev, V. Kaftan, D. Urmanov, A.I. Shakirov","doi":"10.22389/0016-7126-2023-1002-12-17-26","DOIUrl":"https://doi.org/10.22389/0016-7126-2023-1002-12-17-26","url":null,"abstract":"\u0000The authors present the results of developing a library designed for GNSS deformation measurement upshot analysis in the Python 3 environment and their visualization in the QGIS 3 geographic information system. Development of global navigation satellite systems (permanent networks, data publications, creation of software for processing satellite measurement results) has led to increase in the number of researches in the field of studying modern crustal movements. Deformation analysis is a key component in exploring modern crustal and earth’s surface movements. Despite the large number of commercial and freely distributed software for the declared goal, the problem of integrating calculation results into the environment of freely distributed geoinformation systems is still relevant. The presented PyGeoStrain library includes some sets of corresponding subprograms, created QGIS 3 styles for visualizing deformation parameters, original test data, and a control GIS project for the example territory of the Caucasus. For deformation analysis, PyGeoStrain uses the classical geodetic approach to determining the components of the deformation tensor. The use of PyGeoStrain is an adequate replacement for analogue programs due to open access to the source\u0000","PeriodicalId":502308,"journal":{"name":"Geodesy and cartography","volume":"20 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139610746","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