CN109166173B - Multi-precision three-dimensional mapping data fusion method based on BIM - Google Patents
Multi-precision three-dimensional mapping data fusion method based on BIM Download PDFInfo
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- CN109166173B CN109166173B CN201810959289.8A CN201810959289A CN109166173B CN 109166173 B CN109166173 B CN 109166173B CN 201810959289 A CN201810959289 A CN 201810959289A CN 109166173 B CN109166173 B CN 109166173B
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- G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
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Abstract
The invention relates to the field of three-dimensional mapping, and provides a BIM-based multi-precision three-dimensional mapping data fusion method. Aiming at a complex hydropower station with a large range, the requirements of each specialty on the total construction layout terrain in the three-dimensional digital collaborative design are as follows: the range is large, the precision is high, and the model is light; however, the terrain generated by the NURBS curved surface has larger range, higher precision and heavier model, which greatly influences the efficiency and the operation speed of the digital design. In order to solve the problems, the technical scheme of the invention is as follows: by pruning and rejoining the terrain curved surfaces with different precisions, the curved surfaces corresponding to the areas with building structure design in the terrain area to be tested are displayed with high precision, and the curved surfaces corresponding to the areas without building structure design are displayed with low precision, so that the terrain curved surfaces with different precisions are displayed in the same NURBS three-dimensional geological curved surface. The invention has the beneficial effects that: the model is light, the design efficiency and the calculation speed are improved, and the method is suitable for modeling of a complex geological region.
Description
Technical Field
The invention relates to a three-dimensional mapping technology, in particular to a technology for fusing multi-precision three-dimensional mapping data based on BIM.
Background
The three-dimensional mapping data comprises a plurality of formats, wherein the NURBS curved surface is generated through laser point cloud construction and analysis, and the three-dimensional mapping data is particularly suitable for creating a complex curved surface model and meets the requirements of hydropower station design on terrain.
The laser Point Cloud is also called Point Cloud, which is a collection of a series of massive points expressing target space distribution and target surface characteristics, wherein the collection of the points is called Point Cloud. The attributes of the point cloud include: spatial resolution, point location accuracy, surface normal vectors, and the like.
NURBS is an abbreviation for Non-Uniform Rational B-spline curve (Non-Uniform Rational B-Splines), which is not present in the traditional mapping field and is specifically established for 3D modeling using computers.
In the three-dimensional digital design of the hydropower station, in order to meet the collaborative design requirements among the specialties and finally form a complete construction general layout model, the terrain range of the construction general layout is required to be large enough to contain all professional buildings; the precision is high enough to meet the requirements of various professional design specifications; the terrain is sufficiently "light" that professional design efficiency and computation speed cannot be affected. The terrain generated by the NURBS curved surface is constructed by increasing the number of surfaces and the number of segments, the larger the terrain range is, the higher the precision is, the more the number of the curved surfaces and the number of the segments are, and the heavier the model is, so that the professional three-dimensional digital design efficiency and the calculation speed are greatly influenced.
The requirements of each specialty on the construction general arrangement terrain in the three-dimensional digital collaborative design of the hydropower station are as follows: the range is large, the precision is high, and the model is light, but the larger the range is, the higher the precision is, the heavier the model is, and the digital design efficiency and the operation speed are greatly influenced by the terrain generated by the NURBS curved surface.
Disclosure of Invention
The invention aims to provide a BIM-based multi-precision three-dimensional mapping data fusion method, which solves the problem that in the three-dimensional digital collaborative design, the requirements of each specialty on the total construction layout terrain are as follows: the range is large, the precision is high, and the model is light; however, the terrain generated by the NURBS curved surface has the problems that the larger the range is, the higher the precision is, and the heavier the model is, so that the digital design efficiency and the operation speed are greatly influenced.
The invention solves the technical problem, and adopts the technical scheme that: the BIM-based multi-precision three-dimensional mapping data fusion method is characterized by comprising the following steps of:
generating a NURBS three-dimensional geological curved surface of a to-be-measured terrain area according to a three-dimensional mapping technology, trimming and re-jointing the terrain curved surfaces with different precisions, displaying the corresponding curved surface of the area with the building structure design in the NURBS three-dimensional geological curved surface with high precision in the to-be-measured terrain area, and displaying the corresponding curved surface of the area without the building structure design in the NURBS three-dimensional geological curved surface with low precision, so that the terrain curved surfaces with different precisions are displayed in the same NURBS three-dimensional geological curved surface.
Further, the trimming and re-joining of the terrain surfaces with different accuracies specifically comprises the following steps:
step 1, defining a NURBS three-dimensional geological curved surface as a terrain curved surface A, and defining a part of curved surface corresponding to an area with a building structure design as a high-precision terrain curved surface B in the curved surface A;
step 2, extracting a boundary contour of the high-precision topographic curved surface B, stretching the boundary contour for a certain length along the vertical upper direction and the vertical lower direction, and defining a side surface formed by the boundary contour as a curved surface M;
step 3, dividing the terrain curved surface A by using the curved surface M to obtain a low-precision terrain curved surface C outside the boundary contour of the high-precision terrain curved surface B;
step 4, respectively trimming the curved surface M and the terrain curved surface A, C to obtain a structural surface Q of a joint part of the low-precision terrain curved surface C and the high-precision terrain curved surface B;
and 5, jointing the C, B, Q three surfaces to generate a NURBS three-dimensional geological curved surface with different areas and different precisions.
The invention has the advantages that through the BIM-based multi-precision three-dimensional mapping data fusion method, aiming at complicated and large-range terrains, in the NURBS three-dimensional geological curved surface of a terrain area to be detected, by trimming and re-jointing the terrain curved surfaces with different precisions, the corresponding curved surface of the area with the architectural structure design in the NURBS three-dimensional geological curved surface is displayed with high precision, the corresponding curved surface of the area without the architectural structure design in the NURBS three-dimensional geological curved surface is displayed with low precision, the terrains with different precisions in different areas are displayed in the same NURBS three-dimensional geological curved surface, in addition, different areas on the same RBS NURBS three-dimensional geological curved surface have different precisions, the requirements of the layout design range and the design precision are met, the model can be lightened, and the calculation speed of the design efficiency is greatly improved.
Detailed Description
The following describes the technical solution of the present invention in detail with reference to the examples.
The invention discloses a BIM-based multi-precision three-dimensional mapping data fusion method, which comprises the following steps:
firstly, generating a NURBS three-dimensional geological curved surface of a to-be-measured terrain area according to a three-dimensional mapping technology, and secondly, trimming and re-jointing the terrain curved surfaces with different precisions, displaying the corresponding curved surface of the area with the architectural structure design in the NURBS three-dimensional geological curved surface with high precision in the to-be-measured terrain area, and displaying the corresponding curved surface of the area without the architectural structure design in the NURBS three-dimensional geological curved surface with low precision, so that the terrain curved surfaces with different precisions are displayed in the same NURBS three-dimensional geological curved surface.
Different precisions exist in different areas on the same NURBS three-dimensional geological curved surface, the requirements of arrangement design range and design precision are met, the model is light, and the calculation speed of the design efficiency is greatly improved.
Examples
The embodiment of the invention provides a BIM-based multi-precision three-dimensional mapping data fusion method, which comprises the following steps:
firstly, generating a NURBS three-dimensional geological curved surface of a to-be-measured terrain area according to a three-dimensional mapping technology, and secondly, trimming and re-jointing the terrain curved surfaces with different precisions, displaying the corresponding curved surface of the area with the architectural structure design in the NURBS three-dimensional geological curved surface with high precision in the to-be-measured terrain area, and displaying the corresponding curved surface of the area without the architectural structure design in the NURBS three-dimensional geological curved surface with low precision, so that the terrain curved surfaces with different precisions are displayed in the same NURBS three-dimensional geological curved surface.
In the above method, preferably, the trimming and re-joining of the terrain curved surfaces with different accuracies specifically includes the following steps:
step 1, defining a NURBS three-dimensional geological curved surface as a terrain curved surface A, wherein in the curved surface A, a curved surface corresponding to an area with a building structure design can be defined as a high-precision terrain curved surface B;
step 2, extracting a boundary contour of the high-precision topographic curved surface B, stretching the boundary contour for a certain length along the vertical upper direction and the vertical lower direction, and defining a side surface formed by the boundary contour as a curved surface M, wherein the stretching length in the vertical upper direction and the stretching length in the vertical lower direction can be set according to actual requirements;
step 3, dividing the terrain curved surface A by using the curved surface M to obtain a low-precision terrain curved surface C outside the boundary contour of the high-precision terrain curved surface B;
step 4, respectively trimming the curved surface M and the terrain curved surface A, C to obtain a structural surface Q of a joint part of the low-precision terrain curved surface C and the high-precision terrain curved surface B;
and 5, jointing the C, B, Q three surfaces to generate a NURBS three-dimensional geological curved surface with different areas and different precisions.
Claims (1)
1. The BIM-based multi-precision three-dimensional mapping data fusion method is characterized by comprising the following steps of:
generating a NURBS three-dimensional geological curved surface of a to-be-measured terrain area according to a three-dimensional mapping technology, trimming and re-jointing the terrain curved surfaces with different precisions, displaying the corresponding curved surface of the area with the building structure design in the NURBS three-dimensional geological curved surface with high precision in the to-be-measured terrain area, and displaying the corresponding curved surface of the area without the building structure design in the NURBS three-dimensional geological curved surface with low precision, so that the terrain curved surfaces with different precisions are displayed in the same NURBS three-dimensional geological curved surface;
the trimming and rejoining of the terrain surfaces of different accuracies specifically comprises the following steps:
step 1, defining a NURBS three-dimensional geological curved surface as a terrain curved surface A, and defining a part of curved surface corresponding to an area with a building structure design as a high-precision terrain curved surface B in the curved surface A;
step 2, extracting a boundary contour of the high-precision topographic curved surface B, stretching the boundary contour for a certain length along the vertical upper direction and the vertical lower direction, and defining a side surface formed by the boundary contour as a curved surface M;
step 3, dividing the terrain curved surface A by using the curved surface M to obtain a low-precision terrain curved surface C outside the boundary contour of the high-precision terrain curved surface B;
step 4, respectively trimming the curved surface M and the terrain curved surface A, C to obtain a structural surface Q of a joint part of the low-precision terrain curved surface C and the high-precision terrain curved surface B;
and 5, jointing the C, B, Q three surfaces to generate a NURBS three-dimensional geological curved surface with different areas and different precisions.
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| CN110704916B (en) * | 2019-09-24 | 2023-06-16 | 中水北方勘测设计研究有限责任公司 | BIM technology-based large complex three-dimensional geological model grid coarsening method |
| CN111310263B (en) * | 2020-02-10 | 2024-04-12 | 广联达科技股份有限公司 | Fitment visual surface selection method and device, storage medium and electronic equipment |
| CN112818450B (en) * | 2021-02-01 | 2022-04-15 | 中国电建集团成都勘测设计研究院有限公司 | BIM (building information modeling) model organization method based on block index |
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