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【Abstract】 Geometric rectification of topographic map depends on the intersection coordinates of kilometers grid.It′s possible to make the automatic rectification if the intersections can be extracted and their coordinates be defined accurately.This paper proposed a method of real-time and high-accuracy geometric rectification.Firstly,a rapid algorithm is applied to detect the grid lines from topographic map based on an array to decide whether each pixel is on grid line or not.When detecting the first pixe...