The embodiment of the invention provides a topographic feature line extraction method and device, and solves a problem that a characteristic line extraction method in the prior art cannot achieve the convenient screening of extraction results according to the characteristic significance degree. The method comprises the steps: carrying out the preprocessing of collected topographic DEM data; extracting a plurality of feature points and calculating characteristic confidence degree of all feature points; carrying out the feature extension in a feature direction of each feature point or in a direction adjacent to the feature direction of each feature point; obtaining a feature map, and generating a feature forest according to a minimum spanning tree algorithm; carrying out the branch and trunk decomposition of the feature forest, and extracting all feature lines; and selecting a preset number of feature lines with the maximum significance from all feature lines as a topographic feature line set. The method and device can achieve the convenient screening of the extraction results according to the feature significance, and improve the anti-noise capability of feature extraction and the connection of the feature points.
Topographic feature line extraction method and device