TY - JOUR N2 - The paper presents a suggestion of modification of Otrebski' s theorem for some special structures of geodetic networks. The modification leads to forming up the conditional equation system with unknowns. A new parameter as a global criterion of evaluation of the quality of the networks characterized by an inhomogenous observation system, has been introduced as well. L1 - http://journals.pan.pl/Content/121488/PDF-MASTER/4_GK_TOM_LI_ZESZYT_3_2002_Gargula_Modyfikacja.pdf L2 - http://journals.pan.pl/Content/121488 PY - 2002 IS - No 3 EP - 114 A1 - Gargula, Tadeusz PB - Commitee on Geodesy PAS VL - vol. 51 DA - 20.11.2021 T1 - Modification of Otrebski's theorem for equivalent observation systems SP - 107 UR - http://journals.pan.pl/dlibra/publication/edition/121488 T2 - Geodesy and Cartography ER -