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This paper describes the operational issues and basic technical requirements of modern aerial photogrammetry.The accuracy of photogrammetric point determination and the y-parallax at corresponding model points is analyzed when stereo models are reconstituted by using the exterior orientation elements of aerial images.Real aerial photographs,at image scales from 1:2500 to 1:60000,with DGPS/IMU clara taken from various topographies in China were processed by our POS-supported bundle block adjustment program WuCAPS.The empirical results verified that the accuracy of the exteri ororientation elements from bundle block adjustment meets the requirements of the specifications of topographic mapping,However,the accuracy of the exterior orientation elements determined by POS fails to meet the requirements of the specifica-tions of topographicmapping.