TW201944358A - Three-dimensional modeling method and system - Google Patents

Abstract

A three-dimensional modeling method, applied to the modeling of an underground pipeline. The three-dimensional modeling method comprises obtaining a plurality of image data of a region to be modeled wherein the plurality of image data comprise images of a pipeline, a level staff, a plurality of control points, analyzing the obtained image data to build three-dimensional point cloud data of the region to be modeled, obtaining triangle mesh data of the region to be modeled according to the three-dimensional point cloud data and the image data, obtaining a three-dimensional model of the region to be modeled according to the triangle mesh data, length information of the level staff and geographical coordinate information of the control points wherein the three-dimensional model comprises geographical coordinate information of the pipeline, and storing the three-dimensional model in a memory.

Description

Three-dimensional modeling method and system

The invention relates to a three-dimensional modeling method, in particular to a three-dimensional modeling method of an underground pipeline.

In order to ensure the safety of road engineering, the distribution information of the underground pipelines buried in the excavation area should be confirmed before the excavation operation. In the past, many systems used the initial completion drawings of underground pipelines to match the previous construction photos to estimate the distribution information of the underground pipelines. However, this method can only obtain one-sided information, especially for the buried depth of the pipelines.

Nowadays, a method for performing three-dimensional measurement of underground pipelines by using a laser scanner to obtain the distribution information of the underground pipelines has been developed. However, the disadvantages are that the tools are expensive and the amount of data is large, which cannot be real-time through current wireless communication technologies such as 4G Upload the 3D model it built.

In view of the above, the present invention provides a three-dimensional modeling method and system.

The three-dimensional modeling method according to an embodiment of the present invention is applicable to the modeling of underground pipelines. The three-dimensional modeling method includes obtaining a plurality of image data of an area to be modeled, wherein the image data includes pipelines, a level scale, and a plurality of control points. Image, analyze the obtained image data to establish the 3D point cloud data of the area to be modeled, and obtain the triangular mesh data of the area to be modeled based on the 3D point cloud data and image data, based on the triangular mesh data and the length information of the level bar And the geographic coordinate information of the control points to obtain a three-dimensional model of the area to be modeled, where the three-dimensional model contains the geographic coordinate information of the pipeline, and the three-dimensional model is stored in the memory.

The three-dimensional modeling system according to an embodiment of the present invention is suitable for modeling an underground pipeline. The three-dimensional modeling system includes an image input device and a processor, and the two are electrically connected to each other. The image input device obtains a plurality of image data of a region to be modeled, where the image data includes images of pipelines, a level and a plurality of control points. The processor is electrically connected to the image input device, and analyzes the foregoing multiple image data to establish three-dimensional point cloud data of the area to be modeled. Based on the three-dimensional point cloud data and image data, the triangular mesh data of the area to be modeled is obtained, and The grid data, the length information of the level, and the geographic coordinate information of the control point are used to obtain a three-dimensional model of the area to be modeled. The three-dimensional model contains the geographic coordinate information of the pipeline.

With the above structure, the three-dimensional modeling method and system disclosed in this case can obtain the current image data of the underground pipeline construction work area with low-cost and easy-to-operate tools, thereby establishing a high-quality three-dimensional model of the work area. In addition, the three-dimensional modeling method and system disclosed in this case store the three-dimensional model in a portable file format with a small file size and high applicability, which can update the information of the pipeline database in real time, which has the characteristics of high convenience and high efficiency. .

The above description of the contents of this disclosure and the description of the following embodiments are used to demonstrate and explain the spirit and principle of the present invention, and provide a further explanation of the scope of the patent application of the present invention.

The detailed features and advantages of the present invention are described in detail in the following embodiments. The content is sufficient for any person skilled in the art to understand and implement the technical contents of the present invention. Anyone skilled in the relevant art can easily understand the related objects and advantages of the present invention. The following examples further illustrate the viewpoints of the present invention in detail, but do not limit the scope of the present invention in any way.

Please refer to FIG. 1A, which is a functional block diagram of a three-dimensional modeling system 1 according to an embodiment of the present invention. As shown in FIG. 1A, the three-dimensional modeling system 1 is suitable for modeling an underground pipeline, wherein the modeling of the underground pipeline instructs to perform modeling on an area where one or more pipelines and pipe trenches are provided. The three-dimensional modeling system 1 includes an image input device 11 and a processor 12, wherein the image input device 11 and the processor 12 are electrically connected to each other. For example, the image input device 11 may be a wired transmission port such as USB, micro USB, etc., or a wireless transmission port such as a Bluetooth transceiver, a WIFI transceiver, and the like. The image input device 11 obtains a plurality of image data of a region to be 3D modeled (hereinafter referred to as a region to be modeled) through a wired or wireless transmission method (that is, electrically or informationally connected to the image data source), and then transmits the image data to Processor 12. The processor 12 is, for example, a central processing unit (CPU), a microcontroller (microcontroller unit, MCU), a field programmable gate array (FPGA), and an application specific integrated circuit (Application specific integrated circuit (ASIC) or other processors. The processor 12 analyzes and calculates the image data from the image input device 11 to obtain a three-dimensional model of the region to be modeled.

Further, the plurality of image data obtained by the image input device 11 include images of a pipeline, a level and a plurality of control points located in a region to be modeled. The processor 12 analyzes the plurality of image data to establish three-dimensional point cloud data of the area to be modeled; and then obtains the triangular mesh data of the area to be modeled based on the three-dimensional point cloud data and image data; and according to the triangular mesh data and level The length information of the ruler and the geographic coordinate information of the control point are used to obtain a three-dimensional model of the area to be modeled. The detailed process of obtaining the 3D point cloud data and triangle mesh data of the area to be modeled by the processor 12 and the 3D model of the area to be modeled will be described later.

In addition to the image input device 11 and the processor 12, the three-dimensional modeling system may further include other components. Please refer to FIG. 1B, which is a functional block diagram of a three-dimensional modeling system 1 'according to another embodiment of the present invention. As shown in FIG. 1B, the three-dimensional modeling system 1 'includes an image input device 11 and a processor 12, wherein the connection relationship between these two components and their respective operations are similar to the above-mentioned embodiment, and will not be repeated here. In addition, the three-dimensional modeling system 1 'may further include one or more of a memory 13, a camera 14, a prompting device 15, and an operating device 16. It should be particularly noted that FIG. 1B only exemplarily illustrates the connection relationship between the aforementioned components, and is not intended to limit the three-dimensional modeling system of the present invention to include all the aforementioned components. The operation of each component will be further described below.

The memory 13 may be a flash memory, a read-only memory (ROM), a magnetic memory (Magnetoresistive random access memory, MRAM) or other non-volatile storage media, and is electrically connected to Processor 12; memory 13 may also be a cloud database, and information is connected to processor 12. The memory 13 receives and stores the three-dimensional model of the region to be modeled obtained by the processor 12 in a wired or wireless manner. In detail, the processor 12 may store the three-dimensional model of the area to be modeled in the memory 13 in a three-dimensional portable document format (PDF).

The camera 14 may be a general digital camera or an unmanned aerial vehicle (UAV). The camera 14 is electrically or informationally connected to the image input device 11 and shoots the area to be modeled to generate the pipeline, level and control included in the area to be modeled. Image data of the point image. The prompting device 15 may be an alarm or a personal device such as a mobile phone, a tablet computer, and is electrically or informationally connected to the processor 12. When the processor 12 calculates the pipeline's specification information (such as length, width, buried depth) based on the geographic coordinate information of the pipeline ) And when it is judged that it does not meet the standard specification information, the control prompt device 15 outputs a prompt signal, such as an alarm sound, a message notification, etc. The standard specification information can be stored in advance in the memory 13 or the built-in memory of the processor 12 .

The operation device 16 is, for example, another processor and a screen provided in the three-dimensional modeling system, or a personal device such as a mobile phone or a tablet computer, and is electrically or informationally connected to the processor 12. The operating device 16 may provide a platform to display a three-dimensional model of the region to be modeled obtained by the processor 12. For example, the operating device 16 may include software tools suitable for PDF, such as a PDF reader (PDF Reader), Adobe Acrobat Reader, etc., to present a three-dimensional model stored as a PDF file. With the operating device 16, the operator can also measure and mark specifications such as the length and width of the pipeline, the buried depth of the pipeline, the length and width of the pipe trench, and the depth of the pipe trench, and further compare the obtained specification information with the standard specification information to complete the completion supervision and inspection. Work. In yet another embodiment, the processor 12 may be used to connect information to a private or official pipeline database 2 and upload the obtained 3D model or other information obtained from the analysis of the 3D model to update the pipeline database 2.

The three-dimensional modeling method proposed by the present invention will be described below. Please refer to FIGS. 1A, 1B, and 2 to 4, which is a flowchart of the three-dimensional modeling method according to an embodiment of the present invention. 3 and FIG. 4 are detailed flowcharts of the three-dimensional modeling method shown in FIG. 2, respectively. The three-dimensional modeling method proposed by the present invention is applicable to the three-dimensional modeling system 1 or 1 'shown in FIG. 1A or 1B, and is used to perform modeling of an underground pipeline.

In step S21 shown in FIG. 2, the image input device 11 obtains a plurality of image data of the area to be modeled, and then transmits it to the processor 12 to establish a three-dimensional model. Among them, the image data includes images of pipelines, spirit levels, and multiple control points. Further, the step of obtaining the plurality of image data of the area to be modeled includes photographing the area to be modeled to generate the plurality of image data. In detail, a general camera or a UAV can be used as the camera 14, and the fixed-focus mode is used to surround the area to be modeled and shoot at different angles to generate a movie containing multiple image data. For example, videos are less than 20 minutes long. During the shooting process, at least one level is placed on the groove side of the pipeline in the area to be modeled. For example, two level gauges can be placed on the groove side of the pipeline in a non-parallel (or even perpendicular) manner. In order to refer to the x-axis and the y-axis when the subsequent processor 12 performs image processing. In addition, multiple control points are also set in the area to be modeled. For example, the control points can be hole covers or temporary control points defined by manual layout. The number of control points is at least three for the processor. 12 Used in the subsequent establishment of 3D models. In another embodiment, the above-mentioned level can also be implemented by connecting two control points. For example, the control points can be set to the two ends of the hole cover, and the line connecting the two ends (that is, the edge of the hole cover) can be defined as a level ruler. Therefore, the captured image data will include images of pipelines, trenches, spirit levels, and control points located in the area to be modeled.

As a practical example, after the underground pipeline burying project is completed during the construction phase of the road excavation operation process, and before the road surface is restored, the construction photos need to be uploaded in accordance with the operation regulations for verification. At this time, the operator can obtain multiple image data of the area to be modeled in a short time using simple and low-cost tools such as general cameras or cameras, as described above, to achieve a data acquisition process with low tools and time costs and low technical requirements. .

In step S22, the processor 12 parses a plurality of image data received from the image input device 11 to establish three-dimensional point cloud data of a region to be modeled. Further, FIG. 3 exemplarily shows detailed steps S221 to S223 of step S22 in FIG. 2. In step S221, the processor 12 obtains a plurality of Fundamental matrices according to the plurality of image data. In detail, each basic matrix indicates a projected geometric relationship between two of the plurality of image data. Next, in step S222, the processor 12 performs sparse matching according to the plurality of image data and the plurality of basic matrices to obtain original data. In detail, the processor 12 repeatedly performs feature matching on two of the plurality of image data using the corresponding base matrix, and uses a beam method and a terrestrial laser scanning (TLS) method. Or other algorithms to obtain the sparse 3D point cloud of the area to be modeled as the above-mentioned raw data.

Then, in step S223, the processor 12 performs dense matching on the original data to establish three-dimensional point cloud data of the region to be modeled. In detail, the processor 12 may use a block-based multi-view stereo (PMVS) algorithm, a clustering views for multi-view stereo (CVMS) algorithm Or the combination of the above algorithms to calculate the dense three-dimensional point cloud of the area to be modeled. However, the above algorithms are only examples, and the invention is not limited thereto. The processor 12 builds the dense three-dimensional point cloud into three-dimensional point cloud data, where the three-dimensional point cloud data includes preset coordinate information of multiple points. In more detail, the aforementioned sparse and dense 3D point cloud is based on a preset coordinate system. The 3D point cloud contains multiple points, and each point has corresponding preset coordinate information in the preset coordinate system, including x-axis coordinate information, y-axis coordinate information, and z-axis coordinate information.

After the above steps, the processor 12 establishes three-dimensional point cloud data of the area to be modeled. Then, in step S23 of FIG. 2, the processor 12 obtains the triangular mesh data of the region to be modeled according to the three-dimensional point cloud data and the image data. Further, FIG. 4 exemplarily shows detailed steps S231 to S233 of step S23 in FIG. 2. In step S231, the processor 12 classifies the multiple points into multiple sets according to the z-axis coordinate information of the multiple points in the three-dimensional point cloud data. In detail, the processor 12 divides the points having the same z-axis coordinate information into the same set. In step S232, the processor 12 sequentially performs establishment of multiple triangular meshes on two of the plurality of sets. For example, the processor 12 may change the size of the z-axis coordinate information from small to large or The establishment of a triangular mesh is performed on two of the plurality of sets from large to small. Then in step S233, the processor 12 performs texture attachment on the triangular mesh created in step S232 according to the image data obtained from the image input device 11 to obtain triangular mesh data. Among them, the triangular mesh The data still contains preset coordinate information of multiple points of the aforementioned three-dimensional point cloud data, and further includes a triangular mesh created with these points as vertices.

After obtaining the triangular mesh data of the area to be modeled, the processor 12 obtains the desired construction in step S24 shown in FIG. 2 according to the triangular mesh data, the length information of the level and the geographic coordinate information of the control point. 3D model of the model area. In detail, the length information of the level can be measured in advance and stored in the built-in memory of the memory 13 or the processor 12, or the processor 12 can perform image recognition and analysis on the image of the level in the image data. The scale on the output level can be obtained; the geographic coordinate information of the control point can be obtained through the real-time dynamic positioning system (e-GPS), and then stored in the memory built in the memory 13 or the processor 12, that is, , The geographic coordinate information of the control point indicates the coordinates of the control point in the geographic information system (Geography information system, GIS) coordinate system. The GIS coordinate system can be a coordinate system such as TWD97, TWD67, WGS84. The processor 12 converts the preset coordinate information of the points in the triangular grid data into geographic coordinate information according to the length information of the level and the geographic coordinate information of the control points, that is, converts the triangular grid data from the preset coordinate system to geographic Coordinate system as a 3D model. That is, the 3D model can be based on a GIS coordinate system.

In step S25, the processor 12 stores the aforementioned three-dimensional model into the memory 13. Further, the processor 12 may store the three-dimensional model based on the GIS coordinate system as a compressed file of Shapefile (shp), Geography Markup Language (GML), Keyhole Markup Language (KML), and KML. (KMZ) and other formats, and then converted to PDF files and stored in memory 13. By storing the aforementioned three-dimensional model as a PDF file, the file size of the three-dimensional model can be controlled below 40MB. Compared with the traditional three-dimensional modeling method, the memory capacity occupied by the output file can be greatly reduced, and the follow-up can be improved. Speed of reviewing and analyzing data.

In an embodiment, after obtaining the three-dimensional model of the area to be modeled, the processor 12 may obtain the geographic coordinate information of the pipeline or / and the trench by analyzing the three-dimensional model. For example, the processor 12 can determine the area of the pipeline or / and the trench from the three-dimensional model through image analysis, and retrieve the geographic coordinate information of multiple points on the outline of the pipeline or / and the trench. Geographical coordinate information for pipelines and / or trenches. The processor 12 may upload the geographic coordinate information of the pipeline or / and the trench to the official or private pipeline database 2 through the information link to update the information. Further, the processor 12 may calculate the pipeline or / and trench specifications information based on the geographic coordinate information of the pipeline or / and trench, such as the length and width of the pipeline, the buried depth of the pipeline, the length and width of the trench, and the depth of the trench, etc. Mark the specifications of pipelines and / or trenches in the 3D model to integrate them into a PDF file, and then upload them to the official or private pipeline database through the information link2. In addition, standard specifications of pipelines and / or pipes can be pre-stored in the built-in memory of the memory 13 or the processor 12. When the processor 12 determines that the calculated specification information does not meet the pre-stored standard specification information, it will control the prompt The device 15 outputs an alert signal such as an alarm sound or a message notification.

In another embodiment, the three-dimensional model stored as a PDF file may be displayed by the operating device 16. As described in the foregoing embodiment, a software tool (for example, PDF Reader) suitable for PDF may be installed in the operating device 16. The operator can browse the three-dimensional model in three-dimensional mode through the operating device 16 to measure and mark specifications such as pipeline length and width, pipeline buried depth, trench length and trench depth, and further compare the obtained specification information with standard specification information. , Complete the work of completion supervision and examination. In addition, as described in the previous embodiment, the PDF file of the three-dimensional model marked with the specification information can be uploaded to the official or private pipeline database 2 through the information link to further update the pipeline database.

Please refer to Figures 2 to 4, 5A to 5E, 6A, 6B, 7A, 7B, 8A, 8B, 9A, 9B, and 10, of which Figures 5A to 5E, 6A, 6B, 7A, 7B, 8A, 8B, 9A, 9B 10 and 10 are schematic diagrams of the three-dimensional modeling method according to an embodiment of the present invention, and exemplarily provide data maps obtained by each step of the foregoing three-dimensional modeling method. 5A to 5E correspond to a plurality of image data of the region to be modeled obtained in step S21 in FIG. 2, and these image data include images of pipelines A to D, control points P1 to P4, and a level LS, among which the control points P1 and P2 are self-defined temporary control points, control points P3 and P4 are defined by the two ends of the hole cover, and the level LS is defined by the long side of the hole cover, that is, by the control points P3 and P4. The distance between them is used as the length information of the level LS. It should be particularly noted that FIGS. 5A to 5E exemplarily present image data captured by the camera, and are not used to limit the amount of image data and the shooting range.

6A and 6B correspond to step S22 of FIG. 2. In detail, FIG. 6A presents the original data obtained by performing sparse matching in steps S221 to S222 of FIG. 3 according to the image data of FIG. 5A to 5E and the basic matrix thereof. 6B presents the three-dimensional point cloud data obtained after performing dense matching on the original data of FIG. 6A in step S223. FIG. 7A and FIG. 7B correspond to step S23 of FIG. 2. In detail, FIG. 7A shows a plurality of triangular meshes based on the 3D point cloud data of FIG. 6B in steps S231 to S232 of FIG. 4; FIG. 7B shows In step S233, the triangular mesh data obtained by performing texture attachment on the triangular mesh of FIG. 7A is shown in FIG. 7B, and pipelines A to D can be clearly identified in the triangular mesh data. 8A and 8B respectively present part of the triangular mesh data including the control points P1 and P2 and part of the triangular mesh data including the control points P3, P4 and the level LS. As mentioned above, the geographic coordinate information of the control points P1 to P4 can be obtained through e-GPS and stored in advance, and the length information of the level LS can also be measured and stored in advance when shooting the scene.

Corresponding to step S24 in FIG. 2, according to the geographic coordinate information of the control points P1 to P4, the length information of the level bar LS, and the triangular grid data of FIG. 7B, the three-dimensional representation based on the geographic coordinate system shown in FIGS. 9A and 9B can be obtained. model. As shown in FIG. 9A, in the three-dimensional model, geographic coordinate information of the end point Pr1 of the pipeline C can be obtained, such as GIS coordinates. Further, as shown in FIG. 9B, according to the geographic coordinate information of multiple points Pr1 to Pr6 on the pipeline, the specification information of the pipeline, such as the length of the pipeline C, can be calculated. As described in the previous embodiments, the specifications of the pipeline or the trench can be marked in the 3D model to be integrated into a PDF file. As shown in FIG. 10, in the three-dimensional model stored in the PDF format, the specification information of the pipeline B and the pipe trench can be stored. It should be particularly noted that the geographic coordinate information of the end point Pr1 shown in FIG. 9A, the length information of the pipeline C shown in FIG. 9B, and the specification information mark shown in FIG. 10 are all exemplarily shown, and are not Information presentation or marking methods used to limit the three-dimensional modeling system and method of this case.

With the above structure, the three-dimensional modeling method and system disclosed in this case can obtain the current image data of the underground pipeline construction work area with low-cost and easy-to-operate tools, thereby establishing a high-quality three-dimensional model of the work area. In addition, the three-dimensional modeling method and system disclosed in this case store the three-dimensional model in a portable file format with a small file size and high applicability, which can update the information of the pipeline database in real time, which has the characteristics of high convenience and high efficiency. .

Although the present invention is disclosed in the foregoing embodiments, it is not intended to limit the present invention. Changes and modifications made without departing from the spirit and scope of the present invention belong to the patent protection scope of the present invention. For the protection scope defined by the present invention, please refer to the attached patent application scope.

1, 1’‧‧‧ 3D modeling system

11‧‧‧Image Input Device

12‧‧‧ processor

13‧‧‧Memory

14‧‧‧ Camera

15‧‧‧Reminder

16‧‧‧Operating device

2‧‧‧ Pipeline database

A ～ D‧‧‧Pipeline

P1 ～ P4‧‧‧Control points

LS‧‧‧Level

Pr1 ～ Pr6‧‧‧‧points

FIG. 1A is a functional block diagram of a three-dimensional modeling system according to an embodiment of the present invention. FIG. 1B is a functional block diagram of a three-dimensional modeling system according to another embodiment of the present invention. FIG. 2 is a flowchart of a three-dimensional modeling method according to an embodiment of the present invention. FIG. 3 is a detailed flowchart of a three-dimensional modeling method according to an embodiment of the present invention. FIG. 4 is a detailed flowchart of a three-dimensional modeling method according to an embodiment of the present invention. 5A to 5E are schematic diagrams of a three-dimensional modeling method according to an embodiment of the present invention. 6A and 6B are schematic diagrams of a three-dimensional modeling method according to an embodiment of the present invention. 7A and 7B are schematic diagrams of a three-dimensional modeling method according to an embodiment of the present invention. 8A and 8B are schematic diagrams of a three-dimensional modeling method according to an embodiment of the present invention. 9A and 9B are schematic diagrams of a three-dimensional modeling method according to an embodiment of the present invention. FIG. 10 is a schematic diagram of a three-dimensional modeling method according to an embodiment of the present invention.

Claims (13)

A three-dimensional modeling method suitable for modeling underground pipelines. The three-dimensional modeling method includes: obtaining a plurality of image data of a region to be modeled, wherein the image data includes a pipeline, a level and a plurality of control points. Analysis of the image data to establish a three-dimensional point cloud data of the area to be modeled; obtaining a triangular mesh data of the area to be modeled based on the three-dimensional point cloud data and the image data; according to the triangle Obtain a three-dimensional model of the area to be modeled by using grid data, length information of the level and the geographic coordinate information of the control points, wherein the three-dimensional model includes geographic coordinate information of the pipeline; and storing the three-dimensional model in a In memory. The three-dimensional modeling method according to claim 1, wherein the step of obtaining the image data of the area to be modeled includes photographing the area to be modeled to generate the image data. The three-dimensional modeling method according to claim 1, wherein the step of analyzing the image data to establish the three-dimensional point cloud data of the region to be modeled includes: obtaining a plurality of basic matrices according to the image data; Image data and the underlying matrices are sparsely matched to obtain an original data; and the original data are densely matched to establish the three-dimensional point cloud data. The three-dimensional modeling method according to claim 1, wherein the step of obtaining the triangular mesh data of the region to be modeled according to the three-dimensional point cloud data includes: according to the z-axis of a plurality of points in the three-dimensional point cloud data. Coordinate information to classify the points into multiple sets; sequentially perform establishment of multiple triangular meshes on two of the sets; and perform texture attachment on the triangular meshes based on the image data, To get the triangle grid data. The three-dimensional modeling method according to claim 1, wherein the step of obtaining the three-dimensional model of the region to be modeled is based on the triangular mesh data, the length information of the level, and the geographic coordinate information of the control points. Including: converting the triangular grid data from a preset coordinate system to a geographic coordinate system according to the length information of the level and the geographic coordinate information of the control points. The three-dimensional modeling method according to claim 1, wherein the step of storing the three-dimensional model includes storing the three-dimensional model in a portable document format (PDF) to provide a PDF with measurement and annotation functions. The reader renders the three-dimensional model. The three-dimensional modeling method according to claim 1, further comprising: calculating the specification information of the pipeline according to the geographic coordinate information of the pipeline; and outputting an alert signal when the specification information of the pipeline does not meet a standard specification information. A three-dimensional modeling system suitable for modeling underground pipelines. The three-dimensional modeling system includes: an image input device to obtain a plurality of image data of a region to be modeled, wherein the image data includes a pipeline and a level scale And a plurality of control point images; and a processor electrically connected to the image input device, the processor parses the image data to establish a three-dimensional point cloud data of the area to be modeled, based on the three-dimensional point cloud data And the image data to obtain a triangle grid data of the area to be modeled, and to obtain a three-dimensional area of the area to be modeled according to the triangle grid data, the length information of the level and the geographic coordinate information of the control points. Model, where the three-dimensional model contains geographic coordinate information of the pipeline. The three-dimensional modeling system according to claim 8, further comprising a memory connected to the processor and used for storing the three-dimensional model. The three-dimensional modeling system according to claim 9, wherein the processor stores the three-dimensional model in a portable document format (Portable document format (PDF) file) in the memory. The three-dimensional modeling system according to claim 10 further comprises an operating device connected to the processor, and includes a PDF reader with measurement and annotation functions to present the three-dimensional model. The three-dimensional modeling system according to claim 8, further comprising a camera connected to the image input device, and shooting the area to be modeled to generate the image data. The three-dimensional modeling system according to claim 8, further comprising a prompting device connected to the processor, wherein the processor calculates the specification information of the pipeline according to the geographic coordinate information of the pipeline, and when the processor judges When the specification information of the pipeline does not meet a standard specification information, the prompt device is controlled to output a prompt signal.