A method and device for batch-extracting large-section data of rivers
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: 2022-04-29
POWERCHINA ZHONGNAN ENG
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[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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[0047] The flow chart of the invention is as follows Figure 1 As shown in, a method for extracting large section data of rivers in batches includes the following steps:
[0048] 1, adopting the software with rectangular grid division and interpolation functions, setting grid nodes at the place where the cross section needs to be intercepted, and interpolating the elevation to the grid nodes;
[0049] 2, extracting DEM data of grid nodes;
[0050] Step 3, calculate the distance D between the nodes of the cross section. i And 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, the node is divided into the next section; Otherwise, calculate the next node without dividing the section;
[0051] After traversing all the data, go to step 4;
[0052] Step 4, sorting the grid nodes in each section;
[0053] Step 5, sequentially calculating the distances between the ordered nodes, and accumulating to obtain the starting point distance of each grid node; And ...
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The invention discloses a method and device for extracting data of a large section of a river in batches, comprising the following steps: using software with rectangular grid division and interpolation functions, setting grid nodes at the places where sections need to be intercepted, and interpolating the elevation to On the grid node; extract the DEM data of the grid node; divide the DEM data of each grid node into the section; sort the grid nodes in each section; calculate the distance between each node after sorting in turn, And accumulate to get the starting point distance of each grid node; output the elevation and starting point distance of each grid node. Due to the adoption of the above technical solution, compared with the prior art, the present invention hands over the complex part of the algorithm (coordinate interpolation and node positioning) to the software with the function of rectangular grid division, and the designer only needs to write a simple program to perform basic calculations. Batch extraction of cross-sections can be realized, and one-time programming can be used permanently, which greatly saves the time-consuming work of designers.
Description
Technical field [0001] The invention relates to the field of data extraction, in particular to a method and a device for extracting large section data of rivers in batches. technical background [0002] With the progress of surveying and mapping technology, sonar, ultrasonic and other methods are widely used in topographic surveying and mapping. The measurement results of these methods are mostly scattered points of elevation. However, at present, all the longitudinal one-dimensional river numerical simulation softwares (HEC-RAS, MIKE) and some vertical two-dimensional simulation softwares (CE-QUAL-W2) need to input the large section data of rivers. Therefore, it is necessary to convert the "x-y-z" format of scattered elevation points into a large cross-section format with large "starting distance-elevation". [0003] Most of the existing software has the function of terrain cutting, which can obtain section data. However, most of the acquired data formats are still "x-y-z" forma...
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IPC IPC(8): G06F30/23G06F111/10
CPCG06F30/20
Inventor 张科芬黄膺翰朱曦尹小伟李璜
Owner POWERCHINA ZHONGNAN ENG