A hybrid method to the reconstruction of contour lines from scanned topographic maps

This paper addresses with the problem of contour line reconstruction extracted from scanned topographic maps since contour lines play a significant role on construction of Digital Evaluation Models (DEMs) and 3D simulations in serious fields. In this way, a semi-automatic hybrid method based on simple geometrical properties is proposed. The proposed hybrid method is designed by combining the two previously presented methods such as advanced and highly advanced methods in the literature. The contribution of the proposed hybrid method is to increase the accuracy of the advanced method and is to improve the run-time of highly advanced method in the process of reconstruction. The effectiveness of the algorithm is demonstrated by comparing it with the five popular methods in the literature. The implementation results show that the proposed hybrid method outperforms the others and can be efficiently employed in reconstruction process of contour lines.