@ARTICLE{Luong_Chinh_Ke_Algorithms_2002,
 author={Luong, Chinh Ke},
 volume={vol. 51},
 number={No 3},
 journal={Geodesy and Cartography},
 pages={141-152},
 howpublished={online},
 year={2002},
 publisher={Commitee on Geodesy PAS},
 abstract={Automatic generation of DEM based on image matching technique is an important part in digital photograrnmetry. DEM has been found widely in practical applications as in the fields of surveying, civil engineering, road design, agriculture, military, etc. For large DEM project, accuracy, efficiency, and economy are the three main factors to be taken into account. Accuracy is the first important factor to be considered. The effect of modeling methods on DEM accuracy have been tested. The characteristics of terrain surface are considered as a difficult and traditional topic in generating of DEM. Terrain surface may be open or covered with different objects. For generation of accurate DEM, objects on terrain surface must be detected and filtered. There are many methods for detecting and filtering objects which have been found on the terrain surface. Some of them are basing on mutual location of measured points along definite profiles (geometric analysis) or on images converted. This article presents formulas for automatically detecting and filtering covered objects on the base of the geometric analysis of measured points mutually located along determined profiles in X and Y-direction.},
 type={Article},
 title={Algorithms for automatically detecting and filtering ground covered objects for exact generation of DEM},
 URL={http://czasopisma.pan.pl/Content/121491/PDF/7_GK_TOM_LI_ZESZYT_3_2002_Chinh_Ke_Algorytmy.pdf},
}