Geometric Rectification Using Feature Points Supplied by Straight-lines

As the geometric rectification methods are mostly based on ground control points (GCPs), the geometric accuracy of remote sensing image usually fails to meet the demand in the area of lack of feature points. Straight-line features can be the supplement of GCPs. The advantages and disadvantages of ground control straight-lines (GCLs) used for geometric rectification were discussed in detail first. After introducing the conventional geometric correction methods based on points, this paper proposed a novel geometric correction method based on straight-line features, which is not confined to a specific imaging geometric model. Feature points and straight-line features can be united to estimate the geometric model. In the test, instead of merely using control points, the geometric accuracy of model was guaranteed by using control points together with control straight-lines in the region deficient in feature points.