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Boosting the Timeliness of UAV Large Scale Mapping. Direct Georeferencing Approaches: Operational Strategies and Best Practices
ISPRS International Journal of Geo-Information ( IF 3.4 ) Pub Date : 2020-09-30 , DOI: 10.3390/ijgi9100578
Lorenzo Teppati Losè , Filiberto Chiabrando , Fabio Giulio Tonolo

The use of unmanned aerial vehicles (UAVs) is nowadays a standard approach in several application fields. Researches connected with these systems cover several topics and the evolution of these platforms and their applications are rapidly growing. Despite the high level of automatization reached nowadays, there is still a phase of the overall UAVs’ photogrammetric pipeline that requires a high effort in terms of time and resources (i.e., the georeferencing phase). However, thanks to the availability of survey-grade GNSS (Global Navigation Satellite System) receivers embedded in the aerial platforms, it is possible to also enhance this phase of the processing by adopting direct georeferencing approaches (i.e., without using any ground control point and exploiting real time kinematic (RTK) positioning). This work investigates the possibilities offered by a multirotor commercial system equipped with a RTK-enabled GNSS receiver, focusing on the accuracy of the georeferencing phase. Several tests were performed in an ad-hoc case study exploiting different georeferencing solutions and assessing the 3D positional accuracies, thanks to a network of control points. The best approaches to be adopted in the field according to accuracy requirements of the final map products were identified and operational guidelines proposed accordingly.

中文翻译:

提高无人机大规模制图的及时性。直接地理配准方法:操作策略和最佳实践

如今,无人驾驶飞机(UAV)的使用已成为多个应用领域的标准方法。与这些系统相关的研究涉及多个主题,这些平台及其应用的发展正在迅速增长。尽管如今达到了很高的自动化水平,但整个无人机的摄影测量流程仍然存在一个阶段,即在时间和资源上都需要付出很大的努力(即地理配准阶段)。但是,由于内置于空中平台的测量级GNSS(全球导航卫星系统)接收机的可用性,也可以通过采用直接地理配准方法(即,无需使用任何地面控制点和利用实时运动(RTK)定位)。这项工作研究了配备有支持RTK的GNSS接收机的多旋翼商用系统所提供的可能性,重点是地理配准阶段的准确性。借助一个控制点网络,在一个临时案例研究中利用不同的地理配准解决方案并评估3D位置精度进行了几次测试。确定了根据最终地图产品的准确性要求在现场采用的最佳方法,并据此提出了操作指南。
更新日期:2020-09-30
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