Aerial photography refers to an operation that uses aerial photography instrument on an aircraft to take continuous photographs of the ground, combined with ground control point measurement, annotation and three-dimensional survey and mapping and other steps, to draw the topographic map of the ground. Compared with plane table mapping, it not only allows most field measurement operation to be done in doors, but also features fast mapping speed, precision consistency and low cost, and is not subject to climate and season changes.
The traditional aerial photography uses the low-precision airborne POS data, which requires a lot of manpower and resources to carry out high-precision ground control points collection in order to achieve high precision mapping. It is a high-cost and low-efficiency method. NovAtelSPAN-IGM series can solve these problems in a better way. SPAN-IGM series is of small size (152 x 137 x 51 mm) and lightweight (475 ~ 500 g), meets the installation requirements of various flight carriers. Meanwhile High-precision POS results (positions: 1 cm + 1 ppm; heading angle: 0.15 ° ~ 0.08 °; roll angle / pitch angle: 0.035 ° ~ 0.015 °) can reduce the ground control points to be laid out.