Construction method of doubly ruled surface geologic body

Abstract

The invention discloses a construction method of a doubly ruled surface geologic body. The construction method of the doubly ruled surface geologic body aims to solve the problem that a traditional triangular surface patch, tetrahedron, triangular prism or right-angle hexahedron simulates terrain existence. The construction method comprises the following specific steps: 1) determining a space grid cell size; 2) constructing a doubly ruled surface, calculating four vertex coordinates of each doubly ruled surface according to the space grid cell size, and calculating the ruled line of each doubly ruled surface according to the four vertex coordinates of each doubly ruled surface; and 3) according to the doubly ruled surface, constructing a hexahedron. The construction method is applied to the field of geologic body research.

Description

technical field

[0001] The invention relates to a construction method of a double ruled surface geological body. Background technique

[0002] Reasonable and effective modeling expression of geological bodies is the basis of visualization, storage, management and analysis, and it is one of the difficulties in the field of geosciences. At present, the 3D modeling methods of complex geological bodies at home and abroad can be summarized into three types of modeling systems based on surface model, volume model and hybrid model.

[0003] The modeling method of the surface model focuses on the representation of the surface of the 3D geological body, which is represented by an irregular triangular network; the modeling based on the volume model focuses on the overall representation of the boundary and interior of the 3D geological body, and the voxel is used as the basic unit to express 3D solid. At present, there are mainly tetrahedral grid (TEN), triangular prism modeling and ...

Examples

specific Embodiment approach 1

[0049] Specific Embodiments 1. The construction method of a double ruled surface geological body in this embodiment is specifically prepared according to the following steps:

[0050] Step 1. Establish the size of the spatial grid unit; (ie, the size of the double ruled surface), such as 10*10 meters, 5*5 meters, etc. The establishment of this size is related to the accuracy of the spatial expression defined by the user. The higher the accuracy, the grid is required The smaller the size, the error test is established by calculating the accuracy of the double ruled surface.

[0051] Step 2: Construct a double-ruled surface, calculate the four vertex coordinates of each double-ruled surface according to the size of the spatial grid unit, and then calculate the ruled lines of each double-ruled surface according to the four vertex coordinates of each double-ruled surface Wire;

[0052] Step 3: Construct a hexahedron according to the double ruled surface.

specific Embodiment approach 2

[0053] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the spatial grid unit size is established in the step 1; (that is, the size of the double ruled surface), such as 10*10 meters, 5*5 meters, etc., The establishment of this size is related to the accuracy of spatial expression defined by the user. The higher the accuracy, the smaller the grid size is required. The specific process is:

[0054] It is established by calculating the error in the precision of the double ruled surface, and the process of calculating the error in the precision of the double ruled surface is as follows:

[0055] Step 11, determine n inspection points in the double ruled surface, the inspection points are required to be evenly distributed, and can reflect the terrain characteristics, n is the number of actual measurement points, which is a positive integer;

[0056] Step one and two, calculate the inspection point value in the double ruled surface;

[0057] Step 13: C...

specific Embodiment approach 3

[0061] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in the step 2, a double-ruled surface is constructed, and the four vertex coordinates of each double-ruled surface are calculated according to the size of the spatial grid unit, and then Calculate the ruled line of each double-ruled surface according to the four vertex coordinates of each double-ruled surface; the specific process is:

[0062] Specifically according to the following formula:

[0063] P → ( u , v ) = a → + u · b → + v · c → + u · v · d →

[0064]

[0065]

[0066]

[0067]

[0068] In the form...

technical field

[0001] The invention relates to a construction method of a double ruled surface geological body. Background technique

[0002] Reasonable and effective modeling expression of geological bodies is the basis of visualization, storage, management and analysis, and it is one of the difficulties in the field of geosciences. At present, the 3D modeling methods of complex geological bodies at home and abroad can be summarized into three types of modeling systems based on surface model, volume model and hybrid model.

[0003] The modeling method of the surface model focuses on the representation of the surface of the 3D geological body, which is represented by an irregular triangular network; the modeling based on the volume model focuses on the overall representation of the boundary and interior of the 3D geological body, and the voxel is used as the basic unit to express 3D solid. At present, there are mainly tetrahedral grid (TEN), triangular prism modeling and ...

Examples

specific Embodiment approach 1

[0049] Specific Embodiments 1. The construction method of a double ruled surface geological body in this embodiment is specifically prepared according to the following steps:

[0050] Step 1. Establish the size of the spatial grid unit; (ie, the size of the double ruled surface), such as 10*10 meters, 5*5 meters, etc. The establishment of this size is related to the accuracy of the spatial expression defined by the user. The higher the accuracy, the grid is required The smaller the size, the error test is established by calculating the accuracy of the double ruled surface.

[0051] Step 2: Construct a double-ruled surface, calculate the four vertex coordinates of each double-ruled surface according to the size of the spatial grid unit, and then calculate the ruled lines of each double-ruled surface according to the four vertex coordinates of each double-ruled surface Wire;

[0052] Step 3: Construct a hexahedron according to the double ruled surface.

specific Embodiment approach 2

[0053] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the spatial grid unit size is established in the step 1; (that is, the size of the double ruled surface), such as 10*10 meters, 5*5 meters, etc., The establishment of this size is related to the accuracy of spatial expression defined by the user. The higher the accuracy, the smaller the grid size is required. The specific process is:

[0054] It is established by calculating the error in the precision of the double ruled surface, and the process of calculating the error in the precision of the double ruled surface is as follows:

[0055] Step 11, determine n inspection points in the double ruled surface, the inspection points are required to be evenly distributed, and can reflect the terrain characteristics, n is the number of actual measurement points, which is a positive integer;

[0056] Step one and two, calculate the inspection point value in the double ruled surface;

[0057] Step 13: C...

specific Embodiment approach 3

[0061] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in the step 2, a double-ruled surface is constructed, and the four vertex coordinates of each double-ruled surface are calculated according to the size of the spatial grid unit, and then Calculate the ruled line of each double-ruled surface according to the four vertex coordinates of each double-ruled surface; the specific process is:

[0062] Specifically according to the following formula:

[0063] P → ( u , v ) = a → + u · b → + v · c → + u · v · d →

[0064]

[0065]

[0066]

[0067]

[0068] In the form...

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