Hi, I'm trying to convert to JXN one map in ecw format that has two calibrated points. In order to do it, I suppose I have to add the third point. After doing it and pressing accept button I always get the error message "Linear equations system cannot be solved (Matrix determinant=0)". Thanks in advance Gian. Asier
Is it possible that you've put the 3 point on the same line? Draws the three points so to form a large triangle (es top-left, top-right and bottom-right). Check also coordinates. 3 points are better that 2 because OkMap can use affine algorithm instead of similarity; in this way will be considered skew also.