@ARTICLE{Kryński_Jan_Evaluation_2005,
 author={Kryński, Jan and Mank, Magdalena and Grzyb, Małgorzata},
 volume={vol. 54},
 number={No 4},
 journal={Geodesy and Cartography},
 pages={155-175},
 howpublished={online},
 year={2005},
 publisher={Commitee on Geodesy PAS},
 abstract={Calculation of the effect of topography on the observed gravity becomes particularly important when modelling high-precision geoid. It requires a digital terrain model of appropriate resolution and accuracy. Various global, regional and local digital terrain models of different accuracy and resolution are recently available. Evaluation of the DTM used is required for verification and validation of its quality as well as for estimating accuracy of geoid model derived with considering the effect of topographic masses. Two DTMs: the SRTM3 of 3" x 3" resolution and the national DTM for Poland of l" x l" or l" x 2" resolution - called DTED2 - were evaluated with use of high-resolution local DTMs developed using digital photogrammetry of 25 m x 25 m as well as the regional model in Tatra mountains of 10 m x 10 m. Then the heights of almost 1000 GPS/levelling stations of Polish geodetic control were compared with the heights from the DTED2 model. The heights of over a million of gravity stations from gravity database, that were the basis of previous geoid modelling in Poland, were also compared with the heights from the DTED2 model. The effect of uncertainty of a DTM on estimation of mean gravity anomalies was discussed. In particular, the effect of replacing heights from gravity database with the heights from the DTED2 model in the process of calculating mean gravity anomalies, on the accuracy of geoid modelling was investigated. The use of the DTED2 model is at present recommended for determination of precise geoid model in Poland.},
 type={Article},
 title={Evaluation of digital terrain models in Poland in view of a cm geoid modelling},
 URL={http://journals.pan.pl/Content/121292/PDF-MASTER/3_GK_VOL_54_NO_4_2005_Krynski_Ocena_numerycznych.pdf},
 keywords={digital terrain model, DTED, SRTM, heights of gravity stations, DTM evaluation, mean gravity anomalies},
}