Uma sihlela umzila wendiza yomsebenzi wezithombe ze-oblique , ukuze siqoqe ulwazi lokuthungwa kwesakhiwo emaphethelweni wendawo okuhlosiwe, ngokuvamile kuyadingeka ukwandisa indawo yendiza.
Kodwa lokhu kuzoholela ezithombeni eziningi esingazidingi nhlobo, ngoba kulezo zindawo zendiza ezinwetshiwe, kunedatha eyodwa kuphela kwezinhlanu zamalensi eziya endaweni yocwaningo evumelekile .
Inombolo enkulu yezithombe ezingavumelekile izoholela ekwenyukeni kwenani lokugcina ledatha, okuzonciphisa kakhulu ukusebenza kahle kokucubungula idatha, futhi kungase kubangele amaphutha ekubalweni kwe-aerial triangulation(AT).
Isofthiwe yesihlungi sesibhakabhaka inganciphisa ngempumelelo izithombe ezingavumelekile ngo-20%~40%, yehlise inani eliphelele lezithombe cishe ngo-30% futhi ithuthukise ukusebenza kahle kokucubungula idatha ngaphezu kuka-50%.