Quality control and valuation for digital aerial photography in coastal zone

Coastal zone has the characteristics of wide distribution and tide changes, and it is difficult to find ground control points in coastal zone. However, using airborne POS and digital aerial photography technology could overcome these shortcomings of traditional methods. Because the quality of the digital aerial photography is the determinant of result accuracy and geological interpretation, it is necessary to evaluate the quality of acquired digital aerial photography data. This paper firstly analyzed the operation processes of aerial photography and categories of results, selected the index elements which can comprehensively measure the quality of aerial photography, and then controlled these elements to improve the final quality. Secondly, based on the weight given to these elements based on the expert experience method and mathematical statistics, the authors proposed a weighting method involving total factors to evaluate the quality of aerial photography. Finally the correlation between sub elements which influence the quality during the obtaining and processing procedure was identified. And this feature could be used to improve or control quality elements to achieve the purpose of enhancing the accuracy of results. The valuation for aerial remote sensing data of Bohai Sea coastal zone shows that the overall quality is excellent and it matches the actual mapping results. The precision of the results could meet the needs of the coastal geological survey, and the quality control and valuation methods are also feasible.