<abstract xmlns="http://www.w3.org/1999/xhtml">Digital Elevation Models (DEMs) comprise valuable source of elevation data required for many engineering applications. Contour lines, slope - aspect maps are part of their many uses. Moreover, DEMs are used often in geographic information systems (GIS), and are the most common basis for digitally-produced relief maps. This paper proposes a method of generating DEM by using Google Earth elevation data which is easier and free. The case study consisted of three different small regions in the northern beach in Egypt. The accuracy of the Google earth derived elevation data are reported using root mean square error (RMSE), mean error (ME) and maximum absolute error (MAE). All these accuracy statistics were computed using the ground coordinates of 200 reference points for each region of the case study. The reference data was collected with total station survey. The results showed that the accuracies for the prepared DEMs are suitable for some certain engineering applications but inadequate to meet the standard required for fine/small scale DEM for very precise engineering study. The obtained accuracies for terrain with small height difference can be used for preparing large area cadastral, city planning, or land classification maps.In general, Google Earth elevation data can be used only for investigation and preliminary studies with low cost. It is strongly concluded that the users of Google Earth have to test the accuracy of elevation data by comparing with reference data before using it.</abstract>

Investigation of the Accuracy of Google Earth Elevation Data

<abstract xmlns="http://www.w3.org/1999/xhtml">Occasionally, there is a necessity in high-accurate prediction of celestial body trajectory. The most common way to do that is to solve Kepler’s equation analytically or to use Runge-Kutta or Adams integrators to solve equation of motion numerically. For low-orbit satellites, there is a critical need in accounting geopotential and another forces which influence motion. As the result, the right side of equation of motion becomes much bigger, and classical integrators will not be quite effective. On the other hand, there is a multistep-out-of-grid (MOG) method which combines Runge-Kutta and Adams methods. The MOG method is based on using m on-grid values of the solution and <italic>n × m</italic> off-grid derivative estimations. Such method could provide stable integrators of maximum possible order, <italic>O</italic> (<italic>hm</italic>+<italic>mn</italic>+<italic>n−</italic>1).The main subject of this research was to implement and analyze the MOG method for solving satellite equation of motion with taking into account Earth geopotential model (ex. EGM2008 (Pavlis at al., 2008)) and with possibility to add other perturbations such as atmospheric drag or solar radiation pressure. Simulations were made for satellites on low orbit and with various eccentricities (from 0.1 to 0.9). Results of the MOG integrator were compared with results of Runge-Kutta and Adams integrators. It was shown that the MOG method has better accuracy than classical ones of the same order and less right-hand value estimations when is working on high orders. That gives it some advantage over ”classical” methods.</abstract>

National University “Kyiv Polytechnic Institute”, Peremohy ave., 37, 03056, Kyiv,

Space Research Institute National Academy of Sciences of Ukraine and State Space Agency of Ukraine, Glushkov Ave 40, 4/1, 03680, Kyiv 187,

Taras Shevchenko National University of Kyiv, Glushkova ave., 4, 03127, Kyiv,

Main Astronomical Observatory National Academy of Sciences of Ukraine, Zabolotnogo str., 27, 03680, Kyiv,

On the Analysis of Multistep-Out-of-Grid Method for Celestial Mechanics Tasks

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Artificial Satellites

 Artificial Satellites is a journal of planetary geodesy, affiliated to the Space Research Centre, Polish Academy of Sciences. It offers a forum for scientific publications on such aspects of geodesy and geodynamics as positioning, satellite geodesy, gravity field, geoid and heights, tides, reference frames, Earth rotation. We accept original papers of fundamental nature, i.e. concerning new ideas, theories and processing means, as well as those dealing with new applications of the existing methods and technologies.   Why subscribe and read   Artificial Satellites is the only scientific Journal in Poland which presents investigations of Earth’s gravity field, shape, tides and rotation using measurements of geodetic satellites and ground measurements. It contains contributions of many well-known authors from many countries.   Why submit   Fast process of publication because there is usually only two reviewers for each submitted paper. Journal is available on many scientific libraries: i.e. Paris, Washington DC, Moscow, Graz, as well as in all scientific institutes with similar profile of research.   Rejection Rate    48%    Special Issue – submission open   Proceedings of the Second Earth Orientation Parameters Prediction Comparison Campaign (2nd EOP PCC) Workshop No. 2, Alicante, March 1-3, 2023Editors: Prof. Jolanta Nastula, Dr. Małgorzata Wińska, Dr. Henryk DobslawDetails: http://artsat.cbk.waw.pl/proceedings_EOP_PCC.htmlDeadline for manuscript submissions: June 15, 2023   Special Issue – coming soon   Proceedings of the 4th Conference on Aerospace RObotics, CARO⁴, July 6 - 8 2022, Zielona GóraEditors: Prof. Karol Seweryn, Prof. Jerzy SąsiadekDetails: http://artsat.cbk.waw.pl/proceedings_CARO_4.html   Archiving   Sciendo archives the contents of this journal in Portico - digital long-term preservation service of scholarly books, journals and collections.   Plagiarism Policy   The editorial board is participating in a growing community of Similarity Check System's users in order to ensure that the content published is original and trustworthy. Similarity Check is a medium that allows for comprehensive manuscripts screening, aimed to eliminate plagiarism and provide a high standard and quality peer-review process 

Artificial Satellites

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Investigation of the Accuracy of Google Earth Elevation Data

On the Analysis of Multistep-Out-of-Grid Method for Celestial Mechanics Tasks

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