Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.
2007
Volume 10
Issue 4
Topic:
Geodesy and Cartography
ELECTRONIC
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES
Trojanowicz M. 2007. LOCAL MODELING OF QUASI-GEOID HEIGHTS ON THE STRENGTH OF THE UNREDUCED GRAVITY AND GPS/LEVELING DATA, WITH THE SIMULTANEOUS ESTIMATION OF TOPOGRAPHIC MASSES DENSITY DISTRIBUTION, EJPAU 10(4), #35.
Available Online: http://www.ejpau.media.pl/volume10/issue4/abs-35.html

LOCAL MODELING OF QUASI-GEOID HEIGHTS ON THE STRENGTH OF THE UNREDUCED GRAVITY AND GPS/LEVELING DATA, WITH THE SIMULTANEOUS ESTIMATION OF TOPOGRAPHIC MASSES DENSITY DISTRIBUTION

Marek Trojanowicz
Institute of Geodesy and Geoinformatics, Wrocław University of Environmental and Life Sciences, Poland

 

ABSTRACT



One of the problems occurring in the classical methods of geoid and quasi-geoid altitude determination, which lower their accuracy, is the necessity to implement various corrections to the input data. The other important issue in a precise geoid determination is the recognition of topographical masses density distribution. Its variations are significant and could reach one centimeter – even for a slightly folded terrain. The paper suggests the method for the quasi-geoid altitude modeling on the basis of non-reduced surface gravity data and heights anomalies of the GPS/leveling. The method depends on generating a disturbing potential model whose component is the topographical masses density distribution model. The paper presents preliminary examination results performed in the test area located in Lower Silesia, SW Poland. The achieved precision of calculated quasi-geoid heights is about in the meaning of a mean square error. Attained precision of the model is close to the accuracy of a test, GPS/leveling data. Good results were obtained within the range of about 20 km from the border of the area covering a gravity data. It confirms that the proposed solution could be used in case of lack of the gravity data on large regions outside the examined area. The designated model of topographic masses density confirms that such solution allows to interpolate height anomalies and model topographic masses density at the same time.

Key words: quasi-geoid height determination, disturbing potential model, topographical masses density distribution model.


Marek Trojanowicz
Institute of Geodesy and Geoinformatics,
Wrocław University of Environmental and Life Sciences, Poland

Grunwaldzka 53, 50-357 Wrocław, Poland
Phone: (0048) 071 3205681

email: trojanowicz@kgf.ar.wroc.pl

Responses to this article, comments are invited and should be submitted within three months of the publication of the article. If accepted for publication, they will be published in the chapter headed 'Discussions' and hyperlinked to the article.