The Method Research And Error Analysis On Application Of POS Supported Aerial Photogrammetry

Traditionally, the geocoding or georeferencing is solved indirectly applying a number of well known ground control points. In classical photogrammetry this task is solved with aerial triangulation (AT) for multiple images. Try hard to reduce and even shake off the dependent of ground control points involved in photogrammetric mapping has been the important subject of extensive research. With the availability of the Global Position System (GPS) and with the decreasing costs of inertial measurement Unit (IMU), the integrated DGPS/INS-POS has been used in aerial photography and remote sensing. Performance of POS in aerial photography and remote sensing allows the direct measurement of the position and attitude parameters of the sensor stations during the time of exposure, so it enables a variety of mapping products with minimal ground control, even without the use of traditional ground control. Using POS many applications can be realized more efficiently and economically.POS has a stand eqipment for digit camera expasula line-arrar CCD camera. So this paper has made deeply research of POS assistant photogrammetry by POS flight experimentation..The main research work is concluded as follows:1. Describes the basic principles of differential GPS,inertial measurement Unit (IMU) and integrated GPS/IMU system-POS.2. Discusses the two main approach of POS in aerial photography, direct georeferencing and POS-assisted Aerotriangulation. Also analyses the mathematic models, the different using condition of them.3. Discusses the critical techniques in POS-supported photogrammetry just like how to configure differential GPS base-station locations. how to calculate the accuracy position of base stations. how to measure off-centre data. how to calibration camera and IMU.4. According to the test of POSAV510 and IPAS done, study the application of POS supported aerial photogrammetry. After the analysis of the test data, come into being the job-flow, has accumulated the precious experience for the further task of POS assistant photogrammetry.