Abstract:To avoid the use of too many field control points in the spatial scale measurement and analysis of active faults using high-altitude remote sensing images, and to reduce the complexity of the measurement process and improve measurement accuracy, a spatial location method using remote sensing images from aerial triangulation is proposed. By accurately expressing the mathematical relationship between the three-dimensional space coordinates of the ground point and the corresponding image point in a planar coordinate system, control points with high overlap rates (high probability) in the active fault area were selected, and other control points were ignored to reduce the demand of field control points. Ground coordinates of control points and coordinates of image points were taken as known values, and orientation parameters, which accurately expressed the geometric rotation relationship of the object side of the satellite images, were taken as the unknown values. According to the error equation of the rational polynomial coefficient model, ground coordinates of the active fault area were determined by taking the least square as the criterion. The main active fracture interpretation marks of the remote sensing images in the positioning area included linear marks, vertical dislocation marks, and horizontal dislocation marks. Activity degree of active faults was divided into three grades:strong, medium, and weak. Experimental results showed that the spatial scale measured by this method was accurate, and interpretation and characterization of the fault morphologies were consistent with the actual scenario.
