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Method and device for batch extraction of large section data of river

A technology of large cross-sections and cross-sections, which is applied in the field of batch extraction of large-section data of rivers, can solve problems such as the inability to batch extract data of large cross-sections of rivers, and achieve the effects of saving work time and avoiding data errors

Active Publication Date: 2018-11-16
POWERCHINA ZHONGNAN ENG
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Problems solved by technology

[0005] In order to solve the problem of batch extraction of river large-section data in the background technology, the present invention provides a method for batch extraction of river large-section data, which includes the following steps:

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  • Method and device for batch extraction of large section data of river
  • Method and device for batch extraction of large section data of river
  • Method and device for batch extraction of large section data of river

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Embodiment Construction

[0047] The flow chart of the present invention is as figure 1 As shown, a method for batch extracting large section data of rivers includes the following steps:

[0048]Step 1, using software with rectangular grid division and interpolation functions, set grid nodes at the place where the section needs to be intercepted, and interpolate the elevation to the grid nodes;

[0049] Step 2, extracting the DEM data of grid nodes;

[0050] Step 3, calculate the distance d between the section nodes and the nodes i with slope l i , if|d i+1 / d i |i+1 / d i |>5, and |l i+1 / l i |>1.1 or |l i / l i |<0.9, divide the node into the next section; otherwise, do not divide the section and calculate the next node;

[0051] After traversing all the data, go to step 4;

[0052] Step 4, sort the grid nodes in each section;

[0053] Step 5, calculate the distance between each node after sorting in turn, and accumulate to obtain the starting point distance of each grid node; and identify ...

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Abstract

The invention discloses a method and device for batch extraction of large section data of a river. The method comprises the following steps of adopting software with rectangular grid division and interpolation functions, setting grid nodes at positions where sections are needed to be intercepted and interpolating elevations to the grid nodes; extracting DEM data of the grid nodes; dividing the DEMdata of the grid nodes to the sections; sorting the grid nodes in each section; sequentially calculating the distance between the nodes after sorting and conducting accumulation to obtain the starting distance of each grid node; outputting the elevation and starting distance of each grid node. Compared with the prior art, the method and device have the advantages that due to adoption of the technical scheme, the software with the rectangular grid division function is used for dealing with complex parts, such as coordinate interpolations and node positioning, of an algorithm, and designers only need to write a simple program for basic calculation so that batch extraction of the sections can be achieved; moreover, the software can be used permanently by means of one-time programming, and time consumed by the designers during work is greatly saved.

Description

technical field [0001] The invention relates to the field of data extraction, in particular to a method and device for batch-extracting large-section data of rivers. Background technique [0002] With the advancement of surveying and mapping technology, topographic surveying and mapping now mostly uses sonar, ultrasonic and other methods. The measurement results of these methods are mostly elevation scattered points. However, the current numerical simulation calculations of all longitudinal one-dimensional river numerical simulation software (HEC-RAS, MIKE) and partial facade two-dimensional simulation software (CE-QUAL-W2) need to input the large section data of the river. Therefore, it is necessary to convert the elevation scatter points in the "x-y-z" format into a large section format with a large "start distance-elevation". [0003] Most of the existing software has the function of topographic section, which can obtain section data. However, most of the acquired data...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 张科芬黄膺翰朱曦尹小伟李璜
Owner POWERCHINA ZHONGNAN ENG
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