Geoinformation Issues Vol. 1, No 1, 2009
Jan Krynski, Grażyna Kloch-Główka
Evaluation of the Performance of the New EGM2008 Global Geopotential Model over Poland
DOI: 10.34867/gi.2009.1
Abstract. The performance of the new EGM2008 global geopotential model, over Poland, has been evaluated. The tide-free release of the EGM2008 model was also used for the assessment of quality of three precise quasigeoid models developed in the last decade in Poland. The EGM2008 model was compared with GPS/levelling as well as regional gravimetric quasigeoid models. The results obtained confirm high quality of quasigeoid models in Poland. They are in agreement with the previous estimate of their accuracy. Regional quasigeoid model calculated using the EGM2008 model has been found fully comparable with the existing precise quasigeoid models. EGM2008-based quasigeoid model was used to detect outlying GPS/levelling heights in the data set used for the assessment of quality of gravimetric quasigeoid models in Poland.
Andrzej Sas, Andrzej Sas-Uhrynowski, Maria Cisak, Lucjan Siporski
Vertical Gravimetric Calibration Baseline in the Tatra Mountains of Poland
DOI: 10.34867/gi.2009.2
Abstract. This article describes the establishment of an alpine gravimetric calibration baseline in Poland’s Tatra Mountains and the development of a methodology for performing static gravimeter calibration on that baseline. This baseline was established in response to the recent rise in geodynamic research in mountainous areas and the related need to calibrate the gravimetric scale used in such gravimeter research to a high degree of accuracy. The fact that the environmental conditions of such an alpine gravimetric calibration baseline differ considerably from those observed in flat terrains made it necessary to study the impact which rapid changes in atmospheric pressure and environmental temperature may exert on the performance of gravimeters used in such survey. It was also important to study how the method by which the instruments were transported (by automobile, cable car, or on foot) affected their performance. The project led to the establishment of an alpine gravimetric calibration baseline and yielded a set of recommendations for how to proceed with scaling the gravimeters at such a baseline.
Andrzej Sas-Uhrynowski, Elżbieta Welker
Secular Variations of the Geomagnetic Field in Europe
DOI: 10.34867/gi.2009.3
Abstract. The international project MagNetE (Magnetic Net For Europe) was undertaken in 2003. The project has been accepted by the International Association of Geomagnetism and Aeronomy of the IUGG. The common research on the geomagnetic field space and time distribution in Europe, as well as collecting data and its analysis, constitutes the grounds for theoretical works on geomagnetic field models and their parameters. It is also the basis for studying the genesis of the geomagnetic field secular variations and its mechanism. The results of the project enable to increase the accuracy of models on the global, regional, and also on local scale. It has a vital meaning for the regions where the geomagnetic data are not available or, where the existing data, because of their low accuracy, cannot be used. Information about the secular variations of the geomagnetic field makes it possible to update the magnetic data, which is needed in navigation, topography, telecommunication, geology and geophysics and other domains.
The enclosed maps of isopors presented have been compiled using the results of measuring campaigns in the years 2004-2006 together with the archive data. They show the secular variations of the magnetic declination D, the length H of the horizontal intensity vector and the lenght F of the total intensity vector of the geomagnetic field, in the intervals 1995-2000 and 2000-2005. The maps of isopors for Europe have been worked out using data from not only the magnetic observatories, but also from some hundred magnetic secular variation stations (repeated stations), located in 23 European countries. The secular variation differences between data obtained from terrestrial surveys and data from the IGRF model (International Geomagnetic Reference Field) have been presented in the form of maps and histograms.
In several regions of Europe the unexpectedly large secular variation anomalies are visible. Anomalies of so high frequency and large amplitude cannot exist. They are probably caused by data errors, which may have different sources. Their existence cannot be explained by now. Therefore the MagNetE project should be continued.
Ireneusz Ewiak, Bartłomiej Kraszewski
Method for Acquiring Building Registry Vector Data with Modern Photogrammetric Techniques
DOI: 10.34867/gi.2009.4
Abstract. This article presents a methodology for acquiring vector data to supplement building registry databases via a process of integrating surveying data and photogrammetric data using modern measurement tools and methods. The main portion of the article categorizes such a photogrammetric/surveying measurement system developed following this methodology, describing its functionality particularly in respect to the importing and integration of data in the process of adjusting photogrammetric and surveying observations, using the solution of observation equations proposed by authors. The photogrammetric process of obtaining vector data for the use in the building registry, based on stereo measurements performed on models obtained from images taken by the UltraCam-X large-format aerial digital camera and from image sequences obtained from an ADS-40 pushbroom digital aerial camera, have been analysed. Given the increasing importance of photogrammetric measurements in supplying data for building registry databases, the scope of use of such measurements in relation to existing field survey measurements, was considered. The individual stages in the processing of photogrammetric/surveying data using the proposed application developed by the authors within the MicroStation design environment, were presented and discussed. In conclusion it has been stated, that taking the right methodological approach to acquiring such vector data to supplement building registry databases paves the way to establishing a modern cadastral system.
Elżbieta Kozubek, Bogdan Ney, Piotr Werner
Spatial Distribution of Information Society Development in Poland
DOI: 10.34867/gi.2009.5
Abstract. This article overviews factors important to the development of information society (IS) in Poland, considers indicators of the current state of affairs and developmental dynamics of the IS development process, and proposes a certain research methodology. Our study assumes that network access (in a broadly construed sense) is a crucial factor in IS development and poses the following hypothesis: the index of population potential (modified to account for rank-order differences and demographic characteristics of geographical units) constitutes an appropriate measure of network accessibility, and thus in turn may serve as an index of IS development. This hypothesis is then verified on the basis of data for Poland’s voivodships (regions). A Synthetic Index of Information Society (SIIS) is posited, constructed of partial indicators. This synthetic index and the individual partial indicators are correlated against the classical and modified population potential indexes. Based on a review of international and Polish literature, partial indicators are selected for which statistical data can be collected, to use in compiling the synthetic IS measure. Special attention is paid to spatial distribution in the degree of IS development.