Ridge line extraction method based on subbasin boundaries and flow path characteristics
An extraction method and sub-basin technology, applied in the fields of resource environment management and geographic national conditions survey, can solve the problems of DEM noise influence, broken ridge line shape, etc., and achieve the effect of accurate extraction
Active Publication Date: 2015-12-16
NANJING NORMAL UNIVERSITY
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[0006] The technical problem to be solved by the present invention is to overcome the problems that the existing ridgeline extraction method is greatly affected by DEM noise and the shape of the extracted ridgeline is broken, and based on the watershed watershed extraction, provide a method based on sub-watershed boundaries and flow path characteristics. The ridge line extraction method removes the non-ridge part of the watershed according to the characteristics of the water flow path, so as to realize the accurate extraction of the ridge line
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[0022] Combined below as figure 1 As shown in the flowchart, the Tianshe watershed in the hilly area of the Taihu Lake Basin (10,000 km 2 ) is taken as an example to illustrate the specific implementation method of the present invention:
[0023] (1) The Zhongtianshe River Basin, a typical low-mountain and hilly watershed in the Taihu Lake Basin, is selected as the research area. This watershed is located in Liyang City, Jiangsu Province. The main stream of the watershed is 10.4km long and the area is about 42km 2 . There are two different types of landforms in the watershed. The southern part is dominated by mountains, with an elevation range of approximately 180-530m, and the main soil type is gravel soil; the northern part is dominated by residual hills, with an elevation of about 100m, and the main soil type is Yellow sandy soil.
[0024] (2) Using Zhongtianshe River Basin DEM (resolution 25m) as input data, use TauDEM software to carry out filling and flow direction ...
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The invention discloses a ridge line extraction method based on subbasin boundaries and flow path characteristics. The method is based on basin watershed extraction, and removes non-ridge parts in a watershed according to water flow path characteristics, thereby achieving accurate extraction of the ridge line. The technical scheme is that depression detention and flow direction calculation and accumulated flow concentration amount calculation are performed based on a DEM (Digital Elevation Model); a flow concentration cumulant threshold is set to achieve river and subbasin extraction, and subbasin boundaries are obtained; an in-river flow path length of each grid unit is calculated based on flow directions and river grid data; a basin relative elevation HAND (Height Above the Nearest Drainage) of each grid is calculated based on DEM and river grid data; and subbasin boundaries with in-river flow path lengths and HAND values larger than thresholds are extracted and subjected to denoising, refining and vectorization to finally obtain the ridge line. The invention solves problems that the conventional ridge line extraction method is greatly influenced by DEM noise, the extracted ridge line is broken in shape and the like, and has a wide application prospect in fields of resource and environment management, geographical condition preliminary exploration and the like.
Description
technical field [0001] The invention relates to a method for extracting ridgelines based on sub-basin boundaries and flow path characteristics, and the technical application fields are resource environment management and geographic national conditions general survey. Background technique [0002] The ridgelines formed by the long-term action of nature are both geometrically and physically significant. In terms of geometric meaning, it constitutes the dividing line (skeleton line) of terrain fluctuations, so it plays an important role in terrain expression and DEM construction; Implementation has important reference significance. [0003] The existing ridgeline extraction methods can be divided into two categories: methods based on local terrain geometric features and methods based on overall surface water simulation. The methods based on local terrain geometric features include contour curvature maximization method, contour skeletonization method and terrain section extrem...
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IPC IPC(8): G06T7/00
CPCG06T2207/10032G06T2207/30184
Inventor 刘军志朱阿兴刘雪琦沈琳
Owner NANJING NORMAL UNIVERSITY