JP2006349578A - Finished form confirmation system, method and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a finished form confirmation system, method and program properly grasping the precision of a finished form including following construction structures at the previous process stage. <P>SOLUTION: The surface of the finished form is scanned by using a 3-D laser scanner, and the 3-D point group data of the surface of the finished form are composited in the virtual space structured in the computer. Then the virtual structures is established by compositing the information regarding the reference line defined in the field office in the virtual space, and by constructing and moving the perpendicular virtual surface to the reference line. The surface or reverse face of the established virtual structure is displayed by changing the display mode of the surface etc., of the finished form. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a work type confirmation system, method, and program for confirming the precision of a work form constructed in a pre-stage stage at a construction / civil engineering work site.

  In building work and the like, it is very important to grasp the shape of the finished mold to be constructed at the stage of the previous process in order to confirm the effect on the contents and progress of the subsequent process. In particular, the accuracy of work-type construction in underground construction often has a significant impact on the subsequent post-process.

  As a countermeasure against this, conventionally, as a means for grasping the shape of the finished mold, a method of surveying each point at the site using a total station, a transit or the like has been used.

  However, the conventional method described above has a problem that although it takes time and cost, it can only grasp the shape of the finished mold locally, and it is difficult to grasp the constructed finished mold as a whole. In addition, enormous time and labor are required to construct the completed three-dimensional shape by combining the three-dimensional data measured for each point.

On the other hand, a technique for acquiring three-dimensional point cloud data to be measured by a laser scanner is disclosed (for example, see Patent Document 1). For example, in the civil engineering field, as represented by excavation of dams, the target area is measured at high speed for each surface by using a three-dimensional laser scanner for confirming the shape of the excavation slope and managing large amount of soil removal, A method of acquiring a large amount of survey data more accurately in a short time has become widespread.
JP 2005-077385 A

  The present invention has been made in consideration of such circumstances, and can accurately grasp the accuracy of the finished mold to be constructed at the stage of the previous process, including the relationship with the casing to be constructed thereafter. It is an object to provide a work type confirmation system, method, and program.

In order to solve the above problems, the present invention is a work completion confirmation system for confirming the construction accuracy of the work completion in the pre-construction process,
A data measuring means for scanning the surface of the finished mold using a three-dimensional laser scanner and measuring the three-dimensional point cloud data of the finished mold surface;
A space construction means for constructing in the computer a virtual space having a coordinate system based on the origin of the work place;
A work-type composition unit that converts the coordinates of the three-dimensional point cloud data of the work-type surface into coordinates of the coordinate system, and synthesizes the coordinates in the virtual space;
Street core synthesizing means for synthesizing information about the street core defined in the work place in the virtual space;
Virtual surface construction means for constructing a virtual surface perpendicular to the core in the virtual space;
Virtual housing surface setting means for moving the virtual surface in the virtual space and setting a virtual housing surface;
And a data display means for displaying the three-dimensional point cloud data on the finished surface in a different form on the front side or the back side of the virtual enclosure surface.

  Further, the completed type confirmation system according to the present invention is characterized by further comprising distance calculating means for calculating a distance between the three-dimensional point cloud data of the completed type surface and the virtual enclosure surface.

Furthermore, in order to solve the above-mentioned problem, the present invention is a finished mold confirmation method for confirming the construction accuracy of a finished mold in a pre-construction process,
A data measuring step of scanning a finished mold surface using a three-dimensional laser scanner and measuring three-dimensional point cloud data of the finished mold surface;
A space construction process in which a virtual space having a coordinate system based on the origin of the work place is constructed in the computer;
A work-type composition step of converting the coordinates of the three-dimensional point cloud data of the work-type surface into the coordinates of the coordinate system and composing in the virtual space;
A street core synthesizing step of synthesizing information about the street core defined in the work place in the virtual space;
A virtual surface construction step of constructing a virtual surface perpendicular to the core in the virtual space;
A virtual enclosure surface setting step of setting the virtual enclosure plane by moving the virtual plane in the virtual space;
A data display step of changing the display form of the three-dimensional point cloud data on the surface of the finished mold on the front side or the back side of the virtual enclosure surface and displaying the screen.

Furthermore, in order to solve the above-mentioned problem, a program according to the present invention is:
In order to confirm the accuracy of the finished mold in the pre-construction process,
A data input procedure for inputting three-dimensional point cloud data of the finished surface measured by scanning the finished surface using a three-dimensional laser scanner;
A space construction procedure for constructing a virtual space in the computer having a coordinate system based on the origin of the work place;
A work-type composition procedure for converting the coordinates of the three-dimensional point cloud data of the work-type surface into the coordinates of the coordinate system, and composing in the virtual space;
A street core synthesis procedure for synthesizing information about the street core defined in the work place in the virtual space;
A frame surface construction procedure for constructing a virtual surface perpendicular to the core in the virtual space;
A virtual enclosure surface setting procedure for setting the virtual enclosure plane by moving the virtual plane in the virtual space;
And a data display procedure for changing the display form of the three-dimensional point cloud data on the finished surface on the front side or the back side of the virtual enclosure surface, and executing a data display procedure.

Furthermore, in order to solve the above-mentioned problem, the present invention is a work-type confirmation system for confirming the work precision of the work-type in the pre-construction process,
A data measuring means for scanning the surface of the finished mold using a three-dimensional laser scanner and measuring the three-dimensional point cloud data of the finished mold surface;
A space construction means for constructing in the computer a virtual space having a coordinate system based on the origin of the work place;
A work-type composition unit that converts the coordinates of the three-dimensional point cloud data of the work-type surface into coordinates of the coordinate system, and synthesizes the coordinates in the virtual space;
Street core synthesizing means for synthesizing information about the street core defined in the work place in the virtual space;
Virtual surface construction means for constructing a virtual surface perpendicular to the core in the virtual space;
And a distance calculating means for calculating a distance between the three-dimensional point cloud data of the finished surface and the virtual plane.

  According to the present invention, the accuracy of the finished mold to be constructed can be properly grasped at the stage of the previous process including the relationship with the casing to be constructed thereafter.

  Hereinafter, with reference to the drawings, a method for confirming and managing the accuracy of a finished product using the finished product confirmation system according to an embodiment of the present invention will be described in detail.

  The work type confirmation system according to this embodiment includes a data measuring unit that measures data at a construction / civil engineering work site, and the measured data at a work site or company that is separated from the work site or the site. And a data processing unit for processing. FIG. 1 is a conceptual diagram illustrating the configuration and functions of a data measurement unit and a data processing unit of a production confirmation system according to an embodiment of the present invention.

  As shown in FIG. 1, the data measuring unit of the completed type confirmation system is realized using a surveying instrument such as a total station, a three-dimensional laser scanner, or the like. Further, the data processing unit of the completed type confirmation system is realized using a computer such as a personal computer or a workstation. The computer is provided with various executable modules (for example, a loader module, a drawing module, a measurement module including auxiliary figure creation and movement functions, a contour output function, and a coordinate system unification).

  FIG. 2 is a schematic diagram showing the configuration of a completed type confirmation system according to an embodiment of the present invention. In the following, as an example, confirmation of the completed type at the construction work site will be described. First, as the completed type confirmation system according to the present embodiment, the three-dimensional point cloud data for measuring the three-dimensional point cloud data on the surface of the finished type 40 such as a mountain tower constructed for underground underground construction at the construction work site 10 is used. A laser scanner 12, a computer 11 that is a data processing device having a function of displaying the acquired 3D point cloud data and the like in a virtual space, and a storage device 13 that stores 3D point cloud data, 3D CAD data, and the like. Prepare. In addition to the above equipment, a surveying instrument such as a total station generally used for conventional surveying may be used as an auxiliary. The storage device 13 may be built in the computer 11.

  In the computer 11, a virtual space having a coordinate system based on the origin of the work place is constructed in the computer by executing the various modules (software) described above. Then, the 3D point cloud data obtained as a result of measuring the surface of the finished mold 40 with the 3D laser scanner 12 in the pre-stage stage of the underground construction is synthesized in the virtual space, and on-site on the screen of the computer 11 or the like. Visual display. As a result, a worker such as a quality manager can check the construction accuracy of the finished mold 40 such as a mountain tower at the construction work site 10. Further, the computer 11 further synthesizes information on the core (reference line) as shown in the building plan view in the virtual space, and measures the three-dimensional point cloud data of the surface of the finished mold 40 and a predetermined reference plane (for example, street It is also possible to calculate a relationship with a virtual housing surface set by moving a virtual surface constructed based on a plane perpendicular to the core. In the following embodiments, various processes are mainly performed using a horizontal street core, but the target street core in the completed type confirmation system according to the present invention is not limited to the horizontal street core.

  By using the hardware and software of the completed type confirmation system according to this embodiment described above, it is possible to acquire 3D point cloud data on the completed type surface and display it in the virtual space. The three-dimensional point cloud data can output X, Y, and Z coordinate values as text data. In addition, when acquiring the three-dimensional point cloud data by the three-dimensional laser scanner, luminance information, color information, etc. may be acquired together. However, at least the coordinate values of X, Y, and Z are acquired below. The case will be described. In addition, the total station that has been used in construction workshops has a similar format output function.

  Not only the 3D point cloud data measured by the 3D laser scanner 12 is displayed on the computer 11 at the construction work site 10, but also the computer 21 of the office (or company etc.) 20 separated from the construction work site 10. You may make it display similarly using. In this case, the computer 11 of the construction work site 10 and the computer 21 of the office 20 are connected via a network 30 such as a LAN or a telephone line. Further, data acquired using the computer 11 may be stored in a portable storage medium such as a USB memory, a CD-ROM, or an FD, and attached to the computer 21 to give the data to the computer 21. Good. Further, although the three-dimensional point cloud data and the like are stored in the storage device 22 connected to the computer 21, the storage device 22 may be built in the computer 21.

  A three-dimensional laser scanner that can be used at a construction work site or the like is used. FIG. 3 is a diagram illustrating an example of a three-dimensional laser scanner that can be used in the present embodiment. In the present embodiment, as an example, a three-dimensional laser scanner that can collect data in an omnidirectional shape other than the underbody as shown in FIG. 3 is used. Note that the performance and the like shown in the devices A to C shown in FIG. 3 are merely examples, and for example, the numerical values in parentheses vary depending on the environmental conditions. Further, models other than the three models shown in FIG. 3 can be used as long as the X, Y, and Z coordinate values can be output as text data.

  In addition, in the data processing unit in which software realized by the computer 11 or the like of the work type confirmation system according to this embodiment is installed, text data in a format adapted to the coordinate system used in the work place is used. This text data is a point cloud file dedicated to this software in order to reduce the data capacity handled by the loader module section.

  The drawing module also has a function of displaying a plurality of point cloud data read by the loader module in a superimposed manner, changing the colors of the data, and changing the colors to distinguish them. Furthermore, as a measurement module, in addition to an approximate plane creation function for recognizing a group of points scattered in a plane as a plane, any reference point, reference line, reference plane creation function, and various measurement functions between them It is equipped with.

<Example 1>
The above-described completed type confirmation system will be described below with reference to an example of checking the precision of the finished type of the wall of Yamato (SMW: Soil Mixing Wall) and confirming the position of the frame to be constructed thereafter. FIG. 4 is a flowchart for explaining a procedure for confirming the finished product in the previous process stage for confirming the accuracy of the finished product using the system for confirming the finished product according to the embodiment of the present invention and confirming the position with the chassis to be constructed. is there.

  Note that the target mold in this embodiment is a mountain wall surface having a width of about 30 m and a height of about 25 m. First, the surface of the mold using the three-dimensional laser scanner shown in the apparatus B of FIG. The three-dimensional data is scanned (step S11). By using a three-dimensional laser scanner such as the apparatus B, it is possible to acquire data having a relatively high point cloud density in a few minutes without deteriorating the work efficiency of a worker such as a quality manager in the work place. Is possible. That is, three-dimensional data (three-dimensional point cloud data) of the finished surface is acquired from the result of scanning by the three-dimensional laser scanner and stored (stored) in the storage device (step S12).

  Reference points necessary for synthesizing and coordinate conversion of 3D point cloud data before and after acquisition of 3D point cloud data of the shape of a structure (Yamadome in this embodiment) with a 3D laser scanner Measure the selected reference point using a total station or the like. The reference point is used for synthesizing point cloud data obtained by a three-dimensional laser scanner and for coordinate conversion. Therefore, in this case, scanning at least at three points is required.

  In addition, it may not be possible to measure the three-dimensional data of a mountain retaining wall that is a shadow of temporary steel material constructed along the mountain retaining with only one laser scanning. Change the location from time to time and carry out scanning about 3 times to avoid missing wall data measurement. Note that the number of times of measurement is not limited to three times, and may be one time as long as there is no obstacle and measurement can be performed once, or the other times may be measured. In the case of three times of scanning, each point cloud data obtained by each scanning is converted into a coordinate system centered on the origin of the work place and synthesized into one point cloud data.

  Here, a virtual space having a coordinate system based on the origin of the work place is constructed in the computer, and the coordinates of the three-dimensional point group data of the finished surface measured by the three-dimensional laser scanner are the coordinates of the coordinate system. The three-dimensional point cloud data of the finished surface is synthesized in the virtual space (step S13). That is, the coordinate conversion of the shape data of the structure is performed, and the coordinate conversion is performed using the reference point in order to construct the coordinate system of the existing work place.

  Next, the completed shape after the coordinate conversion is browsed. At this time, the core information is given in the virtual space based on the survey data of the total station with reference to the chassis diagram (step S14). FIG. 5 is a view for explaining the relationship between the completed type 3D point cloud data synthesized in the virtual space constructed by the computer in the completed type confirmation system according to this embodiment, the core information, and the virtual frame surface. FIG. That is, as shown in FIG. 5A, the processed three-dimensional point group data 51 and the core information 52 are synthesized in the virtual space by the processing up to step S14.

  5 (a) to 5 (c), 53 is a temporary steel material (pier pile) to be removed after construction of the underground frame surface, and 56 is a mountain retaining material to be removed prior to the construction of the underground frame constructed in sequence. (Upset). In addition, although the mountain retaining material (upset) 56 is not shown in FIG. 5, it is fixed by a ground anchor, a cutting beam or the like.

  Next, as shown in FIG.5 (b), the virtual surface 54 perpendicular | vertical to the core 52 and parallel to the housing | casing surface constructed | assembled after that is constructed | assembled in virtual space (step S15). Thereby, the distance etc. from a street core to a mountain retaining wall surface (finished type | mold surface) can be confirmed.

  And as shown in FIG.5 (c), the virtual surface 54 is moved to the mountain wall surface within the said virtual space, the virtual housing surface 55 is set, and the three-dimensional point of the virtual housing surface and movement-type surface after a movement is set. The group data is displayed on the monitor (screen) (step S16).

  For example, let us consider a case where the dimension from the core to the frame surface is 8600 mm as in the foreground, and the clearance between the wall surface and the frame surface of the dome is 130 mm (the frame error is 50 mm, the clearance is 80 mm). In this case, the frame surface can be created by moving the reference surface on the core to the wall surface side of the 8600 mm mountain stop. An example of the state at this time is shown in FIG. Then, the contour reference surface is used as a housing surface, the outside of the housing surface is displayed in blue, for example, and the inside is displayed in red, for example, and the display form is changed and displayed on a computer monitor or the like.

  FIG. 6 is a diagram showing an example of the contour output displayed on the screen of the computer of the completed type confirmation system according to the embodiment of the present invention. For example, in the part displayed in red, temporary steel materials (pier piles) that will be removed after construction of the underground frame surface, or mountain retaining materials that will be removed prior to construction of the underground frame structure that will be constructed sequentially (upset, etc.) ) Is included. Moreover, the part displayed in blue has shown the wall surface of the mountain stop outside a virtual housing | casing surface. Furthermore, at this time, by displaying the dimension data together, the confirmer can easily grasp more accurate information.

  Further, a three-dimensional CAD model of a structure constructed in the subsequent process may be displayed together. Alternatively, it is possible to collate with a two-dimensional drawing by slicing information in the virtual space at a desired height. FIG. 7 is a diagram showing a collation example with a two-dimensional drawing displayed on the screen of the computer of the completed type confirmation system according to the embodiment of the present invention. In addition, by causing the printer (not shown) to print out the data, it is possible to more specifically show the status of the finished mold to the worker at the work site.

  Further, the normal dimension between the frame surface and the actual point group (blue, red) can also be output. For example, a virtual horizontal plane orthogonal to the virtual enclosure surface set in the vertical direction is constructed in the virtual space, and the virtual horizontal plane is moved in the vertical direction in the virtual space. And you may make it calculate the distance of the three-dimensional data of the point located on a virtual horizontal surface among the three-dimensional point cloud data of a completed surface, and a virtual housing surface.

  As described above, according to the completed type confirmation system according to the present embodiment, laser scanning is performed on a completed type such as a mountain wall at a work site under underground excavation using a three-dimensional laser scanner. For example, a computer output image (contour output) can be displayed with the basement surface to be constructed as a reference plane, for example, the inner side being red and the outer side being blue. With such a display, an operator, a manager, or the like can easily visually grasp the positional relationship between the undulation of the wall surface of the hill and the underground frame surface in the previous process at the work site.

  As a result, at the work site, in the process of constructing the facility work, at the stage of the previous process, the finished mold, and the relation between the finished mold and the shape and position of the gantry pile, SMW, etc. are confirmed. Measures in the next process can be obtained quickly, centering on In addition, since it is also possible to confirm in advance the state where temporary structures such as jetty piles are buffered in the shape of the building frame, it is possible to process products such as floor steel mold materials by passing over the temporary structures. . Furthermore, when a problem is likely to occur in proceeding with the frame construction, it is possible to make design changes such as frame dimensions and position changes in advance and at an early stage of the process.

<Example 2>
In Example 1 described above, the wall surface of the mountain was used as the finished mold for checking accuracy and the like by the finished mold confirmation system. Next, as a second embodiment, the accuracy and the like of a temporary object such as a pier pile is confirmed as a finished mold.

  As a method for confirming the finished type of a temporary structure such as a pier pile, check the relationship with the core, that is, the relationship with the virtual surface, not the relationship with the virtual frame surface that has moved the virtual surface as in the first embodiment. It becomes. The configuration of the completed type confirmation system, the data measurement procedure, and the like are the same as in the case of the completed type such as Yamadome described in the first embodiment (steps S11 to S14 in FIG. 4). Therefore, in the present embodiment, one point cloud data is created by acquiring the three-dimensional point cloud data of the pier pile (H steel) 53 shown in FIG. 5A by scanning a plurality of times using a three-dimensional laser scanner. Then, it is combined with the core information in the virtual space constructed by the computer 11 or the like.

  The number of times of scanning is not particularly limited, but it is necessary to eliminate data omissions by measuring at various positions and angles in order to grasp the finished shape. However, since the size of the pier pile (H steel) used in construction and civil engineering sites is known, the known size information is not measured without measuring the entire surface of the finished steel made from H steel. May be used by combining the data (for example, a three-dimensional H steel model) and the measurement data.

  Next, in the first embodiment, the movable virtual plane is configured on the core, but in this embodiment, the virtual plane constructed in step S15 in FIG. 4 is not movable in order to derive the relationship with the core. May be. And the distance from the virtual surface on a street core to a pier pile (H steel) is calculated. Further, similarly to the first embodiment, not only the distance calculation but also the data display may be enabled so that the worker can visually recognize the positional relationship between the virtual plane and the pier pile.

  It is also possible to set a slice plane in the horizontal direction at a certain height of the constructed virtual plane and collate the drawing data created by two-dimensional CAD or the like with the data on the slice plane. Thereby, it becomes possible to confirm the construction status of a more detailed finished type (pier pile). In addition, when the 3D point cloud data acquired by the 3D laser scanner is displayed on the slice plane, it may be difficult for the operator to check if the H steel is displayed in dot display. A known model of H steel may be applied to the data in the virtual space, and the model may be displayed instead of the point cloud data.

  In the present invention, a program for realizing the functions of the above-described embodiments by a computer is recorded on a computer-readable recording medium (storage medium), and the program recorded on the recording medium is stored in the system. A computer or the like may read and execute. Computer-readable recording media include portable recording media such as USB memory, flexible disk, CD-ROM, and DVD-ROM, hard disks built into the system or computer, and storage such as volatile memory (RAM). Device (recording device). The program may be downloaded to the system, computer, or the like via a network such as the Internet or a communication line such as a telephone line.

  Then, the functions of the above-described embodiments are realized by executing the read program in the system or the computer. In this case, the recording medium or the like stores a program corresponding to the processing procedure described above.

It is a conceptual diagram which shows the structure and function of the data measurement part of a production type confirmation system which concern on one Embodiment of this invention, and a data processing part. It is a schematic diagram which shows the structure of the completed type confirmation system which concerns on one Embodiment of this invention. It is a figure which shows an example of the three-dimensional laser scanner which can be used in this embodiment. It is a flowchart for demonstrating the completion type | mold confirmation procedure in the pre-process stage which performs the precision confirmation of the completion type | mold using the completion type confirmation system which concerns on one Embodiment of this invention, and position confirmation with the structure plan body. It is a figure for demonstrating the relationship between the 3D point cloud data of the completed type synthesize | combined in the virtual space constructed | assembled with the computer in the completed type confirmation system which concerns on this embodiment, street core information, and a virtual frame surface. . It is a figure which shows an example of the contour output displayed on the screen of the computer of the completed type confirmation system which concerns on one Embodiment of this invention. It is a figure which shows the collation example with the two-dimensional drawing displayed on the screen of the computer of the completed type confirmation system which concerns on one Embodiment of this invention.

Claims (5)

It is a work type confirmation system for confirming the work accuracy of the work type in the pre-construction process,
A data measuring means for scanning the surface of the finished mold using a three-dimensional laser scanner and measuring the three-dimensional point cloud data of the finished mold surface;
A space construction means for constructing in the computer a virtual space having a coordinate system based on the origin of the work place;
A work-type composition unit that converts the coordinates of the three-dimensional point cloud data of the work-type surface into coordinates of the coordinate system, and synthesizes the coordinates in the virtual space;
Street core synthesizing means for synthesizing information about the street core defined in the work place in the virtual space;
Virtual surface construction means for constructing a virtual surface perpendicular to the core in the virtual space;
Virtual housing surface setting means for moving the virtual surface in the virtual space and setting a virtual housing surface;
And a data display means for changing the display form of the three-dimensional point cloud data on the surface of the completed mold on the front side or the back side of the virtual enclosure surface.   The system according to claim 1, further comprising distance calculating means for calculating a distance between the three-dimensional point cloud data on the surface of the completed mold and the virtual enclosure surface. It is a completed type confirmation method for confirming the accuracy of the completed type in the pre-construction process,
A data measuring step of scanning a finished mold surface using a three-dimensional laser scanner and measuring three-dimensional point cloud data of the finished mold surface;
A space construction process in which a virtual space having a coordinate system based on the origin of the work place is constructed in the computer;
A work-type composition step of converting the coordinates of the three-dimensional point cloud data of the work-type surface into the coordinates of the coordinate system and composing in the virtual space;
A street core synthesizing step of synthesizing information about the street core defined in the work place in the virtual space;
A virtual surface construction step of constructing a virtual surface perpendicular to the core in the virtual space;
A virtual enclosure surface setting step of setting the virtual enclosure plane by moving the virtual plane in the virtual space;
And a data display step of changing the display form of the three-dimensional point cloud data on the surface of the completed mold on the front side or the back side of the virtual enclosure surface, and displaying the screen. In order to confirm the accuracy of the finished mold in the pre-construction process,
A data input procedure for inputting three-dimensional point cloud data of the finished surface measured by scanning the finished surface using a three-dimensional laser scanner;
A space construction procedure for constructing a virtual space in the computer having a coordinate system based on the origin of the work place;
A work-type composition procedure for converting the coordinates of the three-dimensional point cloud data of the work-type surface into the coordinates of the coordinate system, and composing in the virtual space;
A street core synthesis procedure for synthesizing information about the street core defined in the work place in the virtual space;
A frame surface construction procedure for constructing a virtual surface perpendicular to the core in the virtual space;
A virtual enclosure surface setting procedure for setting the virtual enclosure plane by moving the virtual plane in the virtual space;
A data display procedure for executing a data display procedure for changing the display form of the three-dimensional point cloud data on the finished surface on the front side or the back side of the virtual enclosure surface. It is a work type confirmation system for confirming the work accuracy of the work type in the pre-construction process,
A data measuring means for scanning the surface of the finished mold using a three-dimensional laser scanner and measuring the three-dimensional point cloud data of the finished mold surface;
A space construction means for constructing in the computer a virtual space having a coordinate system based on the origin of the work place;
A work-type composition unit that converts the coordinates of the three-dimensional point cloud data of the work-type surface into coordinates of the coordinate system, and synthesizes the coordinates in the virtual space;
Street core synthesizing means for synthesizing information about the street core defined in the work place in the virtual space;
Virtual surface construction means for constructing a virtual surface perpendicular to the core in the virtual space;
And a distance calculation means for calculating a distance between the three-dimensional point cloud data of the completed surface and the virtual plane.

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