Abstract
Abstract. There are many disasters happened because the weather changes extremely in these years. To facilitate applications such as environment detection or monitoring becomes very important. Therefore, the development of rapid low cost systems for collecting near real-time spatial information is very critical. Rapid spatial information collection has become an emerging trend for remote sensing and mapping applications. This study develops a Direct Georeferencing (DG) based Unmanned Aerial Vehicle (UAV) helicopter photogrammetric platform where an Inertial Navigation System (INS)/Global Navigation Satellite System (GNSS) integrated Positioning and Orientation System (POS) system is implemented to provide the DG capability of the platform. The performance verification indicates that the proposed platform can capture aerial images successfully. A flight test is performed to verify the positioning accuracy in DG mode without using Ground Control Points (GCP). The preliminary results illustrate that horizontal DG positioning accuracies in the x and y axes are around 5 meter with 100 meter flight height. The positioning accuracy in the z axis is less than 10 meter. Such accuracy is good for near real-time disaster relief. The DG ready function of proposed platform guarantees mapping and positioning capability even in GCP free environments, which is very important for rapid urgent response for disaster relief. Generally speaking, the data processing time for the DG module, including POS solution generalization, interpolation, Exterior Orientation Parameters (EOP) generation, and feature point measurements, is less than 1 hour.
Highlights
The idea of mobile mapping is basically executed by producing more than one image that includes the same object from different positions, and the three-dimensional positions of the same object with respect to the mapping frame can be measured (Tao and Li, 2007)
Owing to the limit of the payload and the impact of side wind affecting the attitude of Unmanned Aerial Vehicle (UAV), the endlap and sidelap were increased to 80% and 40% respectively to insure that the coverage of the stereo pair can overlap completely during the test flight
Because the flight height is lower, there is no significant difference between the positioning accuracies obtained using Differential GNSS processing (DGNSS) and PPP mode
Summary
The idea of mobile mapping is basically executed by producing more than one image that includes the same object from different positions, and the three-dimensional positions of the same object with respect to the mapping frame can be measured (Tao and Li, 2007). Aerial photogrammetry, in its classical form of film based optical sensors (analogue) has been widely used for high accuracy mapping applications at all scales and rapid spatial information collection for decades. This model is chosen because of its L1 carrier phase measurements for Differential GNSS processing (DGNSS), which provides sufficient positioning accuracy. It supplies Pulse Per Second (PPS) output, which is used to synchronize the time mark used to trigger the camera in the DG module. ADIS 16488 Accelerometer and Gyroscope Its own PIN design 100 Hertz 10 V ~ 30 V 47 x 46 x 14
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