Mountain boundary automatic extracting method

Abstract

The invention provides a mountain boundary automatic extracting method. The mountain boundary automatic extracting method includes: acquiring mountain boundary surface data, mountain ridge line data and valley line data; associating surfaces which a mountain ridge passes through, and initially forming a mountain boundary; searching surfaces having an adjacent relationship with the mountain boundary surface, using a valley line as a constraint, and associating surfaces meeting a condition; and associating surfaces outside the rule constraint condition, and finally forming a mountain boundary with geographical scales. The mountain boundary automatic extracting method associates the surfaces meeting the condition with the valley line as the constraint on the basis of the mountain boundary surface data, and achieves automatic extraction of the mountain boundary with geographical scales; the extracted mountain is complete, is reasonable in scales, can directly meet the demands of geographical research, can be used as a basis for constructing a mountain object, can provide effective supports for feature analysis of geomorphology and humanity, mountain reconstruction after geological disasters, and terrain multi-scale synthesizing.

Description

technical field [0001] The invention relates to the technical field of geographic information, in particular to a method for automatically extracting mountain boundaries. Background technique [0002] At present, in the existing terrain models, regular sampling points, triangular patches, contour lines, etc. are usually used to express mountains, and avoid directly expressing mountain objects. In fact, there are phenomena such as mountains and river valleys in the terrain, and their positions and shapes can also be clarified, which shows that there are objects in the terrain. In geomorphology, mountains are an important topographic object, and their construction mainly has the following necessity: (1) to provide services for the analysis of geomorphic features in geomorphology and hydrological features in hydrology; (2) in terms of geological disasters, It can make rapid changes and adjustments during mountain reconstruction; (3) The object model of mountains can provide ch...

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Problems solved by technology

[0004] Due to the complexity of mountain terrain and multi-scale problems, when the above method is implemented, the extracted mountain boundary is relatively broken, which is inconsistent with the mountain boundary from the geographical perspective. It is difficult to meet the needs of geographical research, and further manual processing is required, which requires a large investment and low efficiency.

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