Distributed Rooftop Photovoltaic Resource Survey Using Cross-Surround Flight Paths
As various provinces and cities accelerate the construction of distributed rooftop photovoltaic(PV)stations,the preliminary survey of rooftop area and shading conditions has become particularly important.The traditional five-directional oblique photogrammetry meth-od used in preliminary surveys often encounters problems such as model distortion,insufficient accuracy,and high modeling costs when dealing with areas that have uneven heights,complex structures,and dense buildings.To address these issues,this paper introduces a method for sur-veying distributed rooftop PV resources using drones with cross-surround flight paths.By conducting aerial photogrammetry modeling trials in typical sample areas and comparing them with the traditional five-directional flight path method in terms of modeling efficiency,quality,and accuracy of models and output diagrams,the results show that the cross-surround flight path method can significantly reduce image redundan-cy and greatly improve the efficiency of aerial triangulation and modeling.Furthermore,it provides superior modeling results and higher accu-racy,meeting the requirements of relevant standards and specifications,thus proving the feasibility of the cross-surround flight mode in the survey of buildable rooftop PV areas.