Abstract
Attempt has been made in this research to investigate geometric quality of an Unmanned Aerial Photograph from Trimble UX5 Aerial imaging solution for map generation and compilation despite the limited number of control points used and the mode of establishment of the control points. Two important criteria are pivotal to Geometric quality assessment of an Aerial photograph; Geometric accuracy and Object-definition property but this research bothers on the geometric accuracy. In remote sensing and photogrammetric operations, the geometric quality of the imagery basically depends on the relation between pixel size and the map scale, contrast information, atmosphere and the sun elevation, the printing technology, screen resolution and the visual acuity. The Unmanned Aircraft System (UAS) deliverables which are the orthophoto and the digital surface model (DSM) show that UAS (Trimble UX5) can be used for compilation of large scale maps in partly accessible or inaccessible areas according to the map accuracy analysis of the National Standard for Spatial Data Accuracy (NSSDA, 1998). The horizontal accuracy of 3.207m (RMSE: 1.85m) and vertical accuracy of 0.884m (RMSE: 0.45m) were obtained which fall within the allowable misclosure, hence, suitable for Cadastral map compilation.Keywords: Geometric Accuracy, Object-definition, Image, Map generation, Map compilation, Geometric quality
Highlights
In Aerial photogrammetry, orthophotos, topographic maps and other map deliverables have been produced from the aerial photograph acquired using the large format metric cameras
This paper investigates the suitability of the data acquisition system (UAV) through the geometric quality of its deliverables
This section reveals the output of the research work and contains the various deliverables obtained in the course of the data acquisition and data processing
Summary
In Aerial photogrammetry, orthophotos, topographic maps and other map deliverables have been produced from the aerial photograph acquired using the large format metric cameras. Large format aerial cameras are useful for mapping large area but the use of small format digital cameras has helped to achieve the same capacity The small format digital camera has shown great relevance and application in researches. The small format digital camera offers several advantages above large format metric camera. Some of the advantages include portability, accessibility, ease of use and reduced cost (Mikrut 2016), though the scope of this research does not cover cost analysis of the data acquisition methods. A fixed wing Unmanned Aerial Vehicle (Trimble UX5) equipped with a calibrated small format digital camera, global positioning system (GPS), tracking system and inertial navigation system (INS) forms the data acquisition system. This paper investigates the suitability of the data acquisition system (UAV) through the geometric quality of its deliverables
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