This paper outlines research experiments performed on quantative evaluation of 3D geospatial data obtained by means of Photogrammetric Small UAV(PSUAV) developed at Michigan Tech. SUAV platform is equipped with autopilot and capable to accommodate a payload up to 11 pounds. Experiments were performed deploying 12MP Cannon Rebel EOS camera, which was a subject of calibration procedures. Surveying grade GPS equipment was used to prepare ground calibration sites. Work on processing of the obtained datasets encompasses: sensor modeling, single photo resections with image co-registration, mosaicking, and finally 3D terrain models generation. One of the most important results achieved at current stage of PSUAV development is method and algorithms for comparison of UAV obtained DEMs with another models obtained from different geospatial sources.