Incomplete relaxation curve mileage back calculation method

A calculation method and mitigation technology, applied in special data processing applications, geometric CAD, etc.

Active Publication Date: 2021-03-16
HUNAN LIANZHI BRIDGE & TUNNEL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for back-calculation of mileage on incomplete transitio

Method used

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  • Incomplete relaxation curve mileage back calculation method
  • Incomplete relaxation curve mileage back calculation method
  • Incomplete relaxation curve mileage back calculation method

Examples

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Embodiment

[0052] see Figure 1 to Figure 5 , an inverse calculation method for the mileage of an incomplete transition curve. This embodiment is applied to the calculation of the mileage and offset of points on the incomplete transition curve.

[0053] An inverse calculation method for incomplete transition curve mileage, comprising the following steps:

[0054] Step A: According to the line coordinates of point P ( X , Y ) the intersection JD of the intersection interval where the judgment point P is located s and the curve segment corresponding to the intersection;

[0055] The highway route design information in this embodiment is shown in Table 1:

[0056] Table 1 Design information of a highway route (part)

[0057]

[0058] The line coordinates of the known point P are (3827611.5120, 500527.3875). According to the coordinates of the point P and each intersection point, the distance from the point P to each intersection point is calculated, and the closest intersection poin...

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Abstract

The invention provides an incomplete relaxation curve mileage back calculation method. The method comprises the following steps: judging intersection points JDs of an intersection point interval wherea point P is located and curve sections corresponding to the JDs according to line coordinates and line design information of the point P; finding a point P0 closest to the point P on the curve segment corresponding to the JDs; judging whether the linear section where the point P0 is located on the curve section is an incomplete relaxation curve or not; and if the linear section where the point P0 is located on the curve section is an incomplete relaxation curve, complementing the incomplete relaxation curve into a complete relaxation curve, and calculating the line mileage and offset distance d of the point P0. According to the method, the linear segment of the point P0 on the curve segment can be judged only according to the tangent vector of each main point on the curve segment corresponding to the intersection point and the relationship between each main point and the vector of the point P, whether the linear segment is an incomplete relaxation curve or not can be further judged,all line elements do not need to be calculated, and the linear judgment process is simplified.

Description

technical field [0001] The invention relates to the technical field of line engineering, in particular to an inverse calculation method for mileage of an incomplete relaxation curve. Background technique [0002] In the process of line engineering surveying, there will be a lot of problems in calculating coordinates from mileage and inversely calculating mileage from coordinates, such as line centerline stakeout, side stake stakeout, centerline re-measurement, etc. The method of calculating coordinates from mileage has been relatively complete, mainly the line element method and the intersection method. Both methods have their own advantages and have a large number of practical applications; the line element method has a unified calculation method for different linear segments, but it needs There are many initial parameters; the calculation method of the intersection method is simple and clear, but different lines need to be distinguished during calculation. [0003] There ...

Claims

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Application Information

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IPC IPC(8): G06F30/13
CPCG06F30/13
Inventor 吴勇生梁晓东杨承昆刘佳意文言周俊华刘盼盼
Owner HUNAN LIANZHI BRIDGE & TUNNEL TECH
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