CN113763550B - Automatic section production method based on three-dimensional data - Google Patents
Automatic section production method based on three-dimensional data Download PDFInfo
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- CN113763550B CN113763550B CN202110990616.8A CN202110990616A CN113763550B CN 113763550 B CN113763550 B CN 113763550B CN 202110990616 A CN202110990616 A CN 202110990616A CN 113763550 B CN113763550 B CN 113763550B
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Abstract
The invention discloses a section automatic production method based on three-dimensional data, which is characterized by comprising the following steps of: step S1), automatically drawing a neutral line and an auxiliary line of a longitudinal cross section according to neutral line parameters; step S2) overlapping the longitudinal and transverse section auxiliary lines with the three-dimensional model, automatically generating road longitudinal and transverse section data according to the set section spacing, transverse width and height difference threshold value by using a section automatic generation algorithm, and drawing longitudinal and transverse section lines; step S3) overlapping and displaying the longitudinal and transverse sections and the three-dimensional model, checking the fitting condition of the longitudinal and transverse sections and the ground, and modifying the section characteristic points which are not attached to the ground so as to obtain a final longitudinal and transverse section; s4) selecting data formats of different sections to output longitudinal sections and transverse sections; the invention greatly improves the working efficiency of the broken face, effectively solves the workload caused by engineering line change, and provides data support for engineering design in time.
Description
Technical Field
The invention relates to the field of mapping, in particular to a section automatic production method based on three-dimensional data.
Technical Field
The non-contact measurement technology provides a brand new technical means for the longitudinal and transverse measurement of the section of the line engineering, particularly for the highway reconstruction and extension engineering, the three-dimensional topographic data of the engineering can be rapidly obtained under the condition that the conventional road traffic is not influenced, and important achievement data required for engineering investigation and design are provided.
The line engineering longitudinal and transverse section measurement is an important work of line engineering investigation design, and the conventional method at present is to collect full field data by using a total station, a level gauge and an RTK, and then to generate longitudinal and transverse section data through internal trimming and editing. At the same time, the adjustment and change of the line position at the design stage of the line man Cheng Xuanxian can also cause a large amount of repeated measurement work.
Therefore, it is necessary to study a section automatic production method, which can directly extract sections on three-dimensional data automatically and check and modify the sections, thereby improving the working efficiency of measuring the longitudinal and transverse sections of the line engineering and reducing the workload of internal and external industries.
Disclosure of Invention
The invention aims to provide a cross section automatic production method based on three-dimensional data, which can automatically generate a cross section based on the three-dimensional data, greatly improve the cross section operation efficiency, effectively solve the workload caused by engineering line change and provide data support for engineering design in time.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
The automatic production method of the section based on the three-dimensional data is characterized by comprising the following steps of:
s1, automatically drawing a neutral line and an auxiliary line of a longitudinal cross section according to neutral line parameters;
S2: overlapping the longitudinal and transverse section auxiliary lines with the three-dimensional model, automatically generating road longitudinal and transverse section data according to the set section spacing, transverse width and height difference threshold value by using a section automatic generation algorithm, and drawing longitudinal and transverse section lines;
S3, displaying the vertical and horizontal sections and the three-dimensional model in a superposition way, checking the fitting condition of the vertical and horizontal sections and the ground, and modifying the section characteristic points which are not fit with the ground so as to obtain a final vertical and horizontal section;
S4, selecting data formats of different sections to output the longitudinal sections and the transverse sections.
Further, the center line parameters include a start point pile number, coordinates of a turning point of a road, a radius R of a circle curve at the turning point, and a length L 0 of a relaxation curve, and the mileage of each intersection point and the turning point, the azimuth angle between adjacent points, the turning angle and the deflection direction of the line direction are calculated first, and then curve elements and ZH and HZ point coordinates on each curve segment are calculated (see fig. 1, wherein the circle curve is considered as a special case in the relaxation curve in a unified manner, i.e. L 0 =0). And then judging the position of the point on the central line by measuring the mileage of the point, and calculating the unified absolute coordinate of the point on the line according to the position of the point.
Further, the longitudinal and transverse section auxiliary lines are overlapped with the three-dimensional model, and the longitudinal and transverse section data of the road are automatically generated and longitudinal and transverse section lines are drawn according to the set section spacing, transverse section width and height difference threshold values by using a section automatic generation algorithm.
Further, the height difference threshold value can be selected according to actual engineering conditions, and the higher the required accuracy of the section is, the smaller the set value of Gao Chayu value is, and the more the section can reflect the fluctuation of the ground surface.
Further, the specific steps of data processing of the section automatic generation algorithm are as follows:
s21: extracting elevation point data on the three-dimensional model along the section auxiliary line at fixed intervals and storing the elevation point data;
s22: marking the highest point or the lowest point in the array;
S23: deleting Gao Chengdian with the left side and the right side of the highest point or the lowest point smaller than the set height difference threshold value, finding out the first Gao Chengdian which is larger than the height difference threshold value as the next highest point or the lowest point and marking and reserving, and circularly executing the process by taking the new highest point or the new lowest point as a reference until all the characteristic points are found out.
S24: and combining the feature points searched according to the highest points with the feature points searched according to the lowest points to form a longitudinal cross section.
Further, the fixed distance may be selected according to the actual engineering environment, and preferably, the fixed distance is selected to be 1cm.
Further, in the step S3, the section is checked and modified according to the superposition display of the longitudinal section and the transverse section and the three-dimensional model, specifically: and (3) superposing and displaying the longitudinal and transverse sections and the three-dimensional model, checking the fitting condition of the longitudinal and transverse sections and the ground, and modifying the section characteristic points which are not fit with the ground so as to obtain the final longitudinal and transverse sections.
Further, when the three-dimensional model is combined for checking and modifying the longitudinal and transverse section, judging whether the characteristic points in the original unmodified longitudinal and transverse section line are included in the section line or not from multiple view angles according to the superposition display of the longitudinal and transverse section and the model in the three-dimensional view; in particular, for non-ground points that are valued onto vegetation surfaces or suspensions, the point elevation is manually removed or modified to the ground elevation.
Drawings
FIG. 1 is a schematic view of a circle curve at a turning point according to an embodiment of the present invention.
FIG. 2 is a schematic view of a three-dimensional model of a section with elevation points according to an embodiment of the present invention.
FIG. 3 is a schematic representation of a three-dimensional model of a marked section according to one embodiment of the present invention.
FIG. 4 is a schematic diagram of feature point searching based on a three-dimensional model of a section according to an embodiment of the present invention.
FIG. 5 is a flow chart of generating a cross-section based on three-dimensional data of the cross-section in accordance with an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that, the azimuth or positional relationship indicated by "up", "down", etc. is based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship that the inventive product is conventionally put in use, is merely for convenience of describing the present invention and simplifying the description, and does not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present invention.
The invention discloses a technical scheme for realizing the aim, which is as follows:
s1, automatically drawing a neutral line and an auxiliary line of a longitudinal cross section according to neutral line parameters;
S2: overlapping the longitudinal and transverse section auxiliary lines with the three-dimensional model, automatically generating road longitudinal and transverse section data according to the set section spacing, transverse width and height difference threshold value by using a section automatic generation algorithm, and drawing longitudinal and transverse section lines;
S3, displaying the vertical and horizontal sections and the three-dimensional model in a superposition way, checking the fitting condition of the vertical and horizontal sections and the ground, and modifying the section characteristic points which are not fit with the ground so as to obtain a final vertical and horizontal section;
S4, selecting data formats of different sections to output the longitudinal sections and the transverse sections.
Further, the S1 centerline parameters include a starting point pile number, coordinates of a turning point of the road, a radius R of a circular curve at the turning point, and a length L 0 of a relaxation curve, calculating mileage of each intersection point and the turning point, azimuth angle between adjacent points, turning angle and deflection direction of the line direction, and calculating curve elements and coordinates of ZH and HZ points on each curve segment (see fig. 1, consider the circular curve as a special case in the relaxation curve in a unified manner, i.e. L 0 =0). And then judging the position of the point on the central line by measuring the mileage of the point, and calculating the unified absolute coordinate of the point on the line according to the position of the point.
The parameter calculation formula is as follows:
Vertical distance of cutting
Movement of circular curve
Length of tangent line
Length of curve
Moment of external vector
Cut Qu Cha q=2t_l
Straight and slow point coordinates X ZH＝XJD+Tcos(Ai-1+180) YZH＝YJD+Tsin(Ai-1 + 180)
Slow straight point coordinate X HZ＝XJD+Tcos(Ai) YHZ＝YJD+Tsin(Ai
Further, the road longitudinal and transverse section data are automatically generated by using a section automatic generation algorithm according to the set section spacing, section width and height difference threshold value.
The method for processing the data of the automatic section generation algorithm comprises the following steps: extracting elevation points from the three-dimensional model along the longitudinal (transverse) section auxiliary line according to the plane position of the longitudinal (transverse) section auxiliary line at intervals of 1cm (adjustable), storing the elevation points in corresponding section arrays, searching the highest (low) point in the section arrays, deleting the elevation points with the left side and the right side smaller than an elevation difference threshold value (manual input) by taking the highest (low) point as a reference point, searching the first elevation point which is larger than the elevation difference threshold value Gao Chengdian as the next highest (low) point and reserving the next highest (low), continuously deleting the elevation points which are smaller than Gao Chayu value (manual input) by taking the new highest (low) point as the reference point, searching the next highest (low) point and reserving the next highest (low) point, and circularly executing the process until all points in the section arrays are feature points.
The automatic extraction process of the longitudinal and transverse sections comprises the following steps:
① Extracting elevation points on the three-dimensional model at 1cm intervals along the section auxiliary line and storing the elevation points, as shown in fig. 2;
② Searching the highest (low) point in the array and marking, as shown in figure 3;
③ Setting a threshold value (such as 5 cm) of the height difference of the section points, deleting the elevation points with the left side and the right side smaller than the threshold value (manually input) of the height difference from the highest (low) point, and reserving and marking the next highest (low) point; the above process is circularly performed with the new highest (low) point as a reference until all feature points are found, as shown in fig. 4;
④ And combining the section characteristic points searched according to the highest points with the section characteristic points searched according to the lowest points to form transverse and longitudinal section data.
The automatic generation of the vertical and horizontal section is combined with the three-dimensional model and the vertical and horizontal section auxiliary line to edit, check and modify the vertical and horizontal section, and check and modify the error or unreasonable position in the vertical and horizontal section. The method comprises the following specific steps: firstly, selecting the generated auxiliary lines of the longitudinal and transverse sections, and editing against a three-dimensional model to enable the section lines to be more attached to the ground, so that the ground fluctuation situation is reflected better; furthermore, the three-dimensional model is combined for checking and modifying the section, whether the characteristic points in the section line are included in the section line is judged from a plurality of view angles according to the superposition display of the section and the model, and for non-ground points which are valued on the vegetation surface or suspended matters, the point elevation is manually removed or modified to the ground elevation; and finally, after the section inspection and modification are finished, selecting a required format for outputting the longitudinal and transverse sections.
Claims (1)
1. The automatic production method of the section based on the three-dimensional data is characterized by comprising the following steps of:
S1, automatically drawing a neutral line and an auxiliary line of a longitudinal cross section according to neutral line parameters; overlapping the longitudinal and transverse section auxiliary line with a three-dimensional model, automatically generating longitudinal and transverse section data of the road according to the set section spacing, transverse width and height difference threshold value by using a section automatic generation algorithm, and drawing a longitudinal and transverse section line;
the data processing of the section automatic generation algorithm comprises the following steps:
S21: extracting elevation point data on the three-dimensional model along the section auxiliary line at fixed intervals and storing the elevation point data; the fixed interval and the set height difference threshold are manual setting values;
S22: marking the highest point or the lowest point in the array;
S23: deleting Gao Chengdian with the left side and the right side of the highest point or the lowest point smaller than the set height difference threshold, finding out the first Gao Chengdian which is larger than the height difference threshold as the next highest point or the lowest point and marking and reserving, and circularly executing the process by taking the new highest point or the new lowest point as a reference until all the characteristic points are found out;
S24: combining the feature points searched according to the highest points with the feature points searched according to the lowest points to generate a longitudinal cross section;
S3, displaying the vertical and horizontal sections and the three-dimensional model in a superposition way, checking the fitting condition of the vertical and horizontal sections and the ground, and modifying the section characteristic points which are not fit with the ground so as to obtain a final vertical and horizontal section; the modification includes: removing the section characteristic points which are not attached to the ground, and adding redundant characteristic points or adjusting the elevation of the characteristic points;
S4, selecting data formats of different sections to output the longitudinal sections and the transverse sections.
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