CN101908228B - Digital building measuring and drawing method for acquiring building vertical face map - Google Patents

Abstract

The invention discloses a digital building surveying and mapping method for obtaining a building facade surveying drawing, which includes: (1) projecting a horizontal or vertical laser fan onto the outer surface of the building to be measured to form a modeling marking line; Obtain two sets of line segments or their anchor points, a plane intersecting with the proposed building part, and a geometric figure or its anchor point within the viewfinder range of the proposed building part, and measure the fixed dimensions required for drawing the geometric figure; (3 ) to take a photo of the proposed building site; (4) using modeling software to make the perspective relationship between the modeling scene and the perspective of the proposed building site in the photo based on the two groups of line segments or their positioning points in the photo Relational matching; (5) drawing the geometric figure, and using it as the modeling size reference surface to zoom the photo to match, and based on the zoomed photo to set up the three-dimensional model of the building site to be measured; (6) taking the three-dimensional model as According to generate the building elevation survey drawing of the proposed building site.

Description

A Digital Architectural Surveying Method for Obtaining Building Facade Surveying Drawings

technical field

The invention relates to a digital building surveying and mapping method for obtaining building facade surveying and mapping, which is mainly used in the field of modern building surveying and mapping.

Background technique

At present, the well-known architectural surveying and mapping method is the "traditional architectural surveying and mapping method", and its application range includes ancient architectural surveying and mapping, as well as modern and modern architectural surveying and mapping. "Traditional architectural surveying and mapping method" refers to the architectural surveying and mapping method in the modern sense created by the first generation of Chinese architects, Liang Sicheng and Liu Dunzhen, after Zhu Qiqian founded the "China Construction Society" in 1930. Later, it was widely used in China's architectural surveying and mapping industry and has continued to this day. For example, the "Tenth Five-Year Plan" planning textbook "Surveying and Mapping of Ancient Architecture" for civil engineering majors in general higher education continues this architectural surveying and mapping method. (See edited by Wang Qiheng, edited by Wu Cong and Bai Chengjun. Surveying and Mapping of Ancient Architecture [M]. Beijing: China Architecture and Building Press, 2006)

The disadvantages of traditional architectural surveying and mapping methods are mainly reflected in the following four aspects: First, traditional architectural surveying and mapping methods use manual drawing tools and manual drawing methods, as well as manual measurement tools and manual measurement methods to implement architectural surveying and mapping, which leads to the construction of architectural surveying and mapping methods based on On the basis of manual operation, the accuracy and work efficiency of surveying and mapping results need to be improved urgently. The second is that when traditional architectural surveying and mapping methods are used to implement architectural surveying and mapping, the surveyor needs to directly contact the proposed building site to carry out architectural surveying and mapping of the building site, so it is impossible to complete the architectural surveying and mapping of the building site that the surveyor cannot directly contact. The third is that the traditional architectural surveying and mapping method cannot accurately survey and map the building facade surveying drawings of the building parts whose outer surface is a single curved geometric shape and the outer surface is a hyperboloid geometric shape with central axis symmetry. The fourth is the surveying and mapping results of the traditional building surveying and mapping method. The drawing method of the building facade surveying drawing adopts the manual drawing method. less efficient. In recent years, it has been improved to use CAD software to draw building facade surveying drawings based on the building facade surveying and mapping sketches drawn by hand at the surveying and mapping site, but there is still the problem of manually converting the manually drawn building facade surveying and mapping sketches into CAD building facade surveying drawings , The key building elevation surveying and mapping draft still adopts the traditional manual operation mode. Although the accuracy and work efficiency of the finished building elevation surveying drawing have been improved, there is no essential change.

Contents of the invention

The object of the present invention is to provide a digitalized building surveying and mapping method for obtaining building facade surveying drawings.

In order to achieve the above object, the technical solution adopted by the present invention is: the digital building surveying and mapping method for obtaining the building facade surveying drawing comprises the following steps:

(1) Fix the automatic Anping laser marking instrument, and use the laser marking instrument to project a horizontal or vertical laser fan to the outer surface of the building to be measured, and the laser fan to intersect with the outer surface of the building to be measured to form a modeling marking line , the outer surface of the building part to be measured is a single curved geometry or a plane geometry, and the normals of the outer surface of the building part to be measured on the modeling marking line are all on the plane where the laser fan is located ;

(2) Obtain two sets of line segments or the positioning points of two sets of line segments within the viewfinder range of the proposed building site to be photographed, each set of line segments contains two parallel line segments, and the line segments are horizontal lines or vertical lines, different The line segments of the group are perpendicular to each other; obtain a plane intersecting with the building site to be measured, which is perpendicular to the laser fan, obtain a geometric figure or an anchor point forming the geometric figure in the plane, and measure and draw the geometric figure. The required fixed size;

(3) A fixed photographic device, using the photographic device to take a photo of the proposed construction site, the modeling marking line is displayed in the photo, and the two groups of line segments or two groups of line segments are displayed in the photo The location point of the geometric figure or the positioning point constituting the geometric figure is also shown in the photo;

(4) Using modeling software, based on the two groups of line segments in the photo or the anchor points of the two groups of line segments, adjust the perspective relationship of the modeling scene so that the perspective relationship of the modeling scene is consistent with the simulation in the photo. Measure the perspective relationship matching of building parts;

(5) draw corresponding geometric figure according to the fixed size described in step (2), use this geometric figure as the reference plane of modeling size to scale the photo described in step (3), and the photo after scaling matches the reference plane of this modeling size, Establishing a three-dimensional model of the outer surface of the proposed building site based on the scaled photos;

(6) Based on the three-dimensional model described in step (5), a building elevation survey drawing of the proposed building site is generated.

In order to achieve the above object, another technical solution adopted by the present invention is: the digital building surveying and mapping method for obtaining the building facade surveying drawing mainly includes the following steps:

(1) Fix the automatic Anping laser marking instrument, and use the laser marking instrument to project a horizontal or vertical laser fan to the outer surface of the building to be measured, and the laser fan to intersect with the outer surface of the building to be measured to form a modeling marking line , the outer surface of the building part to be measured is a hyperboloid geometric body symmetrical to the central axis, and the central axis of the outer surface of the building part to be measured is located on the plane where the laser fan is located;

(2) Obtain two sets of line segments or the positioning points of two sets of line segments within the viewfinder range of the proposed building site to be photographed, each set of line segments contains two parallel line segments, and the line segments are horizontal lines or vertical lines, different The line segments of the group are perpendicular to each other; obtain a plane intersecting with the building site to be measured, which is perpendicular to the laser fan, obtain a geometric figure or an anchor point forming the geometric figure in the plane, and measure and draw the geometric figure. The required fixed size;

(3) A fixed photographic device, using the photographic device to take a photo of the proposed construction site, the modeling marking line is displayed in the photo, and the two groups of line segments or two groups of line segments are displayed in the photo The location point of the geometric figure or the positioning point constituting the geometric figure is also shown in the photo;

(4) Using modeling software, based on the two groups of line segments in the photo or the anchor points of the two groups of line segments, adjust the perspective relationship of the modeling scene so that the perspective relationship of the modeling scene is consistent with the simulation in the photo. Measure the perspective relationship matching of building parts;

(5) draw corresponding geometric figure according to the fixed size described in step (2), use this geometric figure as the reference plane of modeling size to scale the photo described in step (3), and the photo after scaling matches the reference plane of this modeling size, Establishing a three-dimensional model of the outer surface of the proposed building site based on the scaled photos;

(6) Based on the three-dimensional model described in step (5), a building elevation survey drawing of the proposed building site is generated.

Compared with the prior art, the beneficial effects of the present invention are: (1) Using the prior art, that is, the traditional building surveying and mapping method cannot survey and map the building parts that the operator cannot directly contact, which leads to the inability to implement the surveying and mapping of the building facade surveying map. And use the digital building surveying and mapping method of the present invention, utilize the laser marking instrument to mark the modeling marking line of the proposed building part; The modeling software establishes a digital three-dimensional model of the outer surface of the building part, which can realize the digital architectural surveying and mapping of the building facade surveying drawing of the building part that the surveyor cannot directly touch. (2) No matter whether scaffolding is built or not, the existing technology cannot realize the accurate surveying and mapping of the building elevation mapping of the building parts whose outer surface is a single curved geometric shape and the outer surface is a hyperboloid geometric shape with central axis symmetry. And use the digital building surveying and mapping method of the present invention, can realize the accurate surveying and mapping of the building facade surveying drawing of the building part whose outer surface is a single curved geometric shape, and the outer surface is a hyperbolic geometric shape symmetrical to the central axis. (3) Using the digitalized building surveying and mapping method of the present invention, firstly establish the digitalized three-dimensional model of the building part to be measured, and then use the digitalized three-dimensional model as a basis to generate the building elevation surveying drawing of the building part to be measured. Compared with the building facade surveying drawing drawn on the basis of the building facade surveying and mapping sketch drawn manually at the surveying and mapping site using the prior art, the accuracy of the building facade surveying drawing obtained by using the method of the invention is greatly improved. (4) As a supplementary means of expression for building facade surveying and mapping, the digitalized three-dimensional model of the proposed building site in the mid-term results of the digitalized building surveying and mapping method of the present invention can be directly converted into the final result, that is, a digitalized three-dimensional architectural representation map, the digitalized three-dimensional architectural representation The graph expands and updates the expressive power and range of architectural surveying and mapping results. Compared with the final result architectural elevation survey drawing obtained by using the prior art, the expressiveness of the final result obtained by the present invention is greatly improved.

Description of drawings

Fig. 1 is the schematic diagram that uses the method of the present invention to carry out the surveying and mapping of the building site to be surveyed that the outer surface is a single-curved geometric shape and a plane geometric shape;

Fig. 2 is the schematic diagram that uses the method of the present invention to carry out surveying and mapping to a kind of building site that the outer surface is the hyperboloid geometric body of single curved surface geometric body, planar geometric body and central axis symmetry;

Fig. 3 is the schematic diagram of using the method of the present invention to survey and map another kind of building site whose outer surface is a single curved geometry, a plane geometry and a hyperboloid geometry with central axis symmetry;

Fig. 4 is the three-dimensional model of the planned construction site in Fig. 2 obtained using the method of the present invention;

Fig. 5 is the building facade surveying drawing of the proposed measuring building part that the present invention generates on the basis of the three-dimensional model in Fig. 4;

Fig. 6 is the three-dimensional model of the planned construction site in Fig. 3 obtained using the method of the present invention;

Fig. 7 is the building facade surveying drawing of the proposed measuring building part generated on the basis of the three-dimensional model in Fig. 6 in the present invention;

In the figure, 1. Auxiliary tool I; 2. Photographic device; 3. Laser marking instrument; 4. Vertical laser fan; 5. Modeling marking line; . Accessibility II.

Detailed ways

The digital building surveying and mapping method of the present invention includes three surveying and mapping links: a marking link, a photographing link and a modeling link.

(1) The goal of the marking link of the digital architectural surveying and mapping method of the present invention is to use the automatic Anping laser marking instrument 3 to mark the modeling marking line 5 on the outer surface of the building site 6 to be measured.

The marking tool used in the digital building surveying and mapping method of the present invention is an automatic Anping laser marking instrument 3 . At present, there are two types of laser marking instruments with automatic leveling function and those without automatic leveling function on the market. The automatic leveling function is the function of automatically adjusting the laser transmitter to make it in a horizontal working state. This invention only uses the laser with automatic leveling function. Marker 3. The present invention utilizes the automatic leveling function of the laser marking instrument 3, that is, as long as the laser marking instrument 3 is in the working state, the emitted laser sector must be the function of the horizontal laser sector and the vertical laser sector 4, and the laser marking instrument 3 is used to measure The outer surface of the building part 6 projects a horizontal laser fan or a vertical laser fan 4, and the intersection line formed by the intersection of the horizontal laser fan or the vertical laser fan with the outer surface of the building part 6 to be measured is the horizontal section plane or vertical plane of the building part 6 to be measured. The outer contour line of the cut plane, that is, the outer contour line of the building elevation survey drawing of the proposed building part 6, is called the modeling marking line 5 .

At present, there are many types of automatic Anping laser marking instruments on the market. For example, the Laisai LS 619 automatic Anping laser marking instrument can output a 180° horizontal laser sector, two 180° vertical laser sectors perpendicular to each other, and a vertical downward The laser positioning point; Laisai LS618 automatic Anping laser marking instrument can output a 180° horizontal laser sector, two mutually perpendicular 90° vertical laser sectors, and a vertically downward laser positioning point. The automatic Anping laser marking instrument is equipped with a special tripod. The automatic Anping laser marking instrument can be placed directly on the ground or other building parts for use, and can also be installed on a special tripod for use.

In the marking link of the present invention, the specific operation steps of marking the modeling marking line on the outer surface of the building part to be measured by using the automatic Anping laser marking instrument are as follows:

As shown in Fig. 1, Fig. 2 and Fig. 3, the automatic leveling laser marking instrument 3 is fixed, and the laser marking instrument 3 is used to project a vertical laser sector 4 to the outer surface of the building part 6 to be measured, and the vertical laser sector 4 is aligned with the building to be measured The outer surfaces of the parts 6 intersect to form a modeling marking line 5 .

As shown in Figure 1, when the outer surface of the building part 6 to be measured is a single-curved geometric body or a plane geometric body, it is necessary to make the normals of the outer surface of the building part 6 to be measured on the modeling marking line 5 all within On the plane where the vertical laser fan 4 is located, the modeling marking line 5 thus obtained is the effective modeling marking line.

If the normals on the outer surface of the building part 6 to be measured are all on the same horizontal plane, the laser sector projected by the laser marking instrument 3 to the outer surface of the building part 6 to be measured is a horizontal laser fan. Die mark line 5 is horizontal direction.

As shown in Figures 2 and 3, when the outer surface of the building part 6 to be measured is a hyperboloid geometric body with central axis symmetry, it is necessary to make the central axis of the outer surface of the building part 6 to be measured be located in the plane where the vertical laser fan 4 is located Above, the modeling marking line 5 thus obtained is the effective modeling marking line.

If the central axis of the outer surface of the building part 6 to be measured is a horizontal line, the laser sector projected by the laser marking instrument 3 to the outer surface of the building part 6 to be measured is a horizontal laser fan, and the modeling marking line 5 is a horizontal direction.

Within the range that the surveyor can directly operate, the present invention directly places the laser line marking instrument 3 on the ground, floor, building surface, or installs the laser line marking instrument 3 on a special tripod and places it on the ground, floor, building surface, etc. Surface marking modeling marking line 5.

As shown in FIG. 1 , the present invention installs a laser marking instrument 3 on a special tripod and places it on a building floor to mark a modeling marking line 5 .

In the range that the surveyor cannot directly operate, the present invention installs the laser marking instrument 3 on the auxiliary tool to mark the modeling marking line 5 .

As shown in Figure 3, when the surveyor cannot directly operate and the position of the laser marking instrument 3 is higher than the position of the surveyor, the present invention fixes the laser marking instrument 3 on the auxiliary tool 1, and raises the auxiliary tool 1. After the laser marking instrument 3 is raised to the height of the predetermined marking line, the auxiliary tool 1 is used to control the laser marking instrument 3 to rotate to the predetermined marking line position to mark the modeling marking line 5, so as to realize the position higher than the position of the surveyor, surveying and mapping The marking of the modeling marking line 5 of the proposed building part 6 that the operator cannot directly operate. In the present invention, auxiliary tool 1 can also use means such as scaffolding to place laser marking instrument 3 in the predetermined marking position except that the top as shown in Figure 3 has a lifting rod with rotatable movable rod.

As shown in Figure 2, when the surveyor cannot directly operate and the position of the laser marking instrument 3 is lower than the position of the surveyor, the present invention installs the laser marking instrument 3 on the auxiliary tool II, and uses the auxiliary tool II Lower the laser marking instrument 3 to the predetermined marking position to mark the modeling marking line 5, so as to realize the marking of the modeling marking line on the building parts that are lower than the position of the surveyor and cannot be directly operated by the surveyor. Similarly, the auxiliary tool II used in the present invention can not only be the liftable bracket as shown in FIG. 2 , but also can place the laser marking instrument 3 at a predetermined marking position by means of scaffolding and other means.

(2) The object of the photographing link of the digitalized building surveying and mapping method of the present invention is to use the photographing device 2 to take photographs of the marking line modeling of the proposed building site 6 .

The preparatory work that needs to be completed before taking the marking line modeling photo includes: obtaining two sets of line segments within the viewfinder range of the proposed building site 6 to be photographed, specifically, each set of line segments acquired consists of two line segments, these The line segments are all horizontal lines or vertical lines, and the two line segments in the same group of line segments are parallel to each other, while the line segments in different groups are perpendicular to each other; or, obtain the positioning of the two groups of line segments within the viewfinder range of the proposed building site 6 to be photographed Similarly, the obtained anchor points should meet the following conditions: the connecting lines of these anchor points are horizontal lines or vertical lines, and the connecting lines of the anchor points in the same group are parallel to each other, while the connecting lines of the anchor points in different groups are perpendicular to each other.

In addition, obtain a plane intersecting with the building site 6 to be measured, the plane is parallel or perpendicular to the laser fan, obtain a geometric figure or an anchor point that constitutes the geometric figure in the plane, and measure the fixed size required for drawing the geometric figure .

The photographing link of the present invention utilizes photographing device to take the specific operation steps of marking line modeling photo as follows:

As shown in Figures 1 and 2, within the viewfinder range of the planned building site 6 to be photographed, a line segment group 1 including line segment AB and line segment DC, and a line segment group 2 including line segment AD and line segment BC, line segment group 1 are obtained Line segment AB and line segment DC in are parallel to each other and both are horizontal lines, line segment AD and line segment BC in line segment group 2 are parallel to each other and both are vertical lines, and the line segments in line segment group 1 and line segment group 2 are perpendicular to each other. The present invention can directly obtain the plane ABCD positioned by the line segment AB and the line segment DC, the plane ABCD intersects with the building site 6 to be measured, and is perpendicular to the vertical laser fan 4; Measure the plane where the building part 6 intersects, as long as the plane is within the viewfinder range of the planned building part 6 to be photographed, and is parallel or perpendicular to the vertical laser sector 4.

As an embodiment of the present invention, as shown in Fig. 1 and Fig. 2, the plane ABCD positioned by the line segment AB and the line segment DC is obtained directly, and the geometric figures on the plane, i.e. the rectangle ABCD, are measured to draw the rectangle ABCD. Define the length of line segment AB and line segment BC. Of course, the present invention can additionally acquire a geometric figure or an anchor point of the geometric figure in the plane ABCD, and measure the dimension required for drawing the geometric figure. It should be noted that the shape of the obtained geometric figures can be arbitrary, but generally the common geometric figures with simple linear shapes in buildings, such as rectangles, are the preferred solutions, so as to quickly and accurately measure the geometric figures required to draw the geometric figures. Shaped to size.

As shown in Fig. 1 and Fig. 2, within the range that the surveyor can directly operate, the present invention utilizes a conventional photographic device and a conventional photographing method to take a photo of the marking line modeling of the building site 6 to be measured, and the marking line modeling photo shows Modeling marking line 5, line segment group 1, line segment group 2 and geometric figures ABCD.

As shown in Figure 3, when the surveyor cannot directly operate and the shooting position is higher than the surveyor's position, the present invention fixes the photography device 2 on the liftable auxiliary tool 1, and raises the auxiliary tool 1 after adjusting the shooting angle. Tool 1 raises the photographing device 2 to a predetermined shooting height; utilizes the auxiliary tool 1 to control the photographing device 2 to rotate to a predetermined shooting position, and uses a wireless remote controller to control the photographing device 2 to shoot. Use the auxiliary tool 1 to raise the camera device 2 to take pictures. It is necessary to take a pre-shoot to confirm whether the viewfinder range of the marking line modeling photo meets the requirements. , photographs taken for marking modeling of building parts that surveyors cannot directly operate. As shown in Fig. 3, the obtained plane intersecting and perpendicular to the proposed building site 6 is the plane AEFBCGHD, and the anchor points of the selected geometric figure 7 are A, E, F, B, C, G, H, and D. Therefore, the obtained marking line modeling photo shows the modeling marking line 5 and the anchor points A, B, C, and D of line segment group 1 and line segment group 2, and the anchor point A, B of the geometric figure 7 is also displayed on the photo , C, G, H, D.

(3) The goal of the modeling link of the digital architectural surveying and mapping method of the present invention is based on the marking line modeling photo, using modeling software to set up a digital three-dimensional model of the outer surface of the building part 6 to be measured, and generate the building part 6 to be measured Building elevation survey drawing.

The specific operation steps of the modeling link of the present invention are as follows:

Based on the completed marking line modeling photos, use modeling software, such as Google SketchUp software, to establish a three-dimensional model of the outer surface of the building site 6 to be measured.

As shown in Figure 2, import the marking modeling photo of the building part 6 to be measured, and adjust the perspective relationship of the modeling scene based on the line segments AB, DC, AD, and BC in the marking modeling photo so that the building The perspective relationship of the modeling scene matches the perspective relationship of the proposed building part 6 in the marking line modeling photo.

Thereafter, according to the geometric figures acquired at the surveying and mapping site, i.e. the measurement data of the lengths of the fixed dimension line segment AB and the line segment BC of the rectangle ABCD, the rectangle ABCD is drawn as the modeling dimension reference plane 7, and the photo is zoomed to make it correspond to the modeling dimension Match the reference surface 7; according to the scaled photo, establish a drawing reference plane and draw a modeling marking line on the drawing reference plane; establish the modeling section of the proposed building part 6 and generate the model of the proposed measuring building part 6 Path: According to the modeling section and modeling path of the proposed building part 6, a three-dimensional model of the proposed building part 6 in FIG. 2 is established, and the three-dimensional model is shown in FIG. 4 . Then, a building elevation survey drawing of the proposed building site 6 is generated based on the three-dimensional model, as shown in FIG. 5 .

Use the same modeling software, such as Google SketchUp software, follow the same modeling steps, and build a 3D model of the proposed building part 6 based on the marking line modeling photo of the proposed building part 6 in Figure 3, the 3D model is shown in Figure 6 as shown in FIG. 2 ; then, according to the three-dimensional model, the building elevation surveying drawing of the proposed building part 6 is generated, and the building elevation surveying drawing is shown in FIG. 7 .

The present invention uses a non-direct contact digital architectural surveying and mapping method to replace the prior art traditional architectural surveying and mapping method with direct contact with manual operations. From Fig. 4 to Fig. 7, it can be seen that the present invention can realize the building elevation of the building part whose outer surface is a single-curved geometric shape and whose outer surface is a hyperboloid geometric shape whose central axis symmetry cannot be accurately surveyed and mapped using the traditional architectural surveying and mapping method of the prior art. Accurate surveying and mapping of surface surveying and mapping, greatly improving the accuracy of building elevation surveying and mapping results. In addition, the present invention can use the obtained digital three-dimensional model of the building part to be measured to directly generate the building facade surveying drawing of the building part, without drawing the building facade surveying drawing separately based on the hand-drawn building facade surveying and mapping draft, thereby greatly improving Accuracy and productivity in building elevation mapping.

Claims (2)

1. a kind of digital building surveying and mapping method for obtaining building facade surveying drawing, it is characterized in that comprising the steps: (1) Fix the automatic Anping laser marking instrument, and use the laser marking instrument to project a horizontal or vertical laser fan to the outer surface of the building to be measured, and the laser fan intersects with the outer surface of the building to be measured to form a modeling marking line , the outer surface of the building part to be measured is a single curved geometry or a plane geometry, and the normals of the outer surface of the building part to be measured on the modeling marking line are all on the plane where the laser fan is located ; (2) Obtain two sets of line segments or the positioning points of two sets of line segments within the viewfinder range of the proposed building site to be photographed, each set of line segments contains two parallel line segments, and the line segments are horizontal lines or vertical lines, different The line segments of the group are perpendicular to each other; obtain a plane intersecting with the building site to be measured, which is perpendicular to the laser fan, obtain a geometric figure or an anchor point forming the geometric figure in the plane, and measure and draw the geometric figure. The required fixed size; (3) A fixed photographic device, using the photographic device to take photos of the proposed building site, where the modeling marking lines are shown in the photos, and the two sets of line segments or two sets of line segments are shown in the photos The location point of the geometric figure or the positioning point constituting the geometric figure is also shown in the photo; (4) Using modeling software, based on the two groups of line segments or the anchor points of the two groups of line segments in the photo, adjust the perspective relationship of the modeling scene so that the perspective relationship of the modeling scene is consistent with the virtual scene in the photo. Measure the perspective relationship matching of building parts; (5) Draw the corresponding geometric figure according to the fixed size described in step (2), and use the geometric figure as the reference surface of the modeling size to scale the photo described in step (3), and the scaled photo matches the reference surface of the modeling size, Establishing a three-dimensional model of the proposed building site based on the scaled photos; (6) Based on the three-dimensional model described in step (5), a building elevation survey drawing of the proposed building site is generated. 2. A digital building surveying and mapping method for obtaining building facade surveying drawings, is characterized in that comprising the steps: (1) Fix the automatic Anping laser marking instrument, and use the laser marking instrument to project a horizontal or vertical laser fan to the outer surface of the building to be measured, and the laser fan intersects with the outer surface of the building to be measured to form a modeling marking line , the outer surface of the building part to be measured is a hyperboloid geometric body symmetrical to the central axis, and the central axis of the outer surface of the building part to be measured is located on the plane where the laser fan is located; (2) Obtain two sets of line segments or the positioning points of two sets of line segments within the viewfinder range of the proposed building site to be photographed, each set of line segments contains two parallel line segments, and the line segments are horizontal lines or vertical lines, different The line segments of the group are perpendicular to each other; obtain a plane intersecting with the building site to be measured, which is perpendicular to the laser fan, obtain a geometric figure or an anchor point forming the geometric figure in the plane, and measure and draw the geometric figure. The required fixed size; (3) A fixed photographic device, using the photographic device to take photos of the proposed building site, where the modeling marking lines are shown in the photos, and the two sets of line segments or two sets of line segments are shown in the photos The location point of the geometric figure or the positioning point constituting the geometric figure is also shown in the photo; (4) Using modeling software, based on the two groups of line segments or the anchor points of the two groups of line segments in the photo, adjust the perspective relationship of the modeling scene so that the perspective relationship of the modeling scene is consistent with the virtual scene in the photo. Measure the perspective relationship matching of building parts; (5) Draw the corresponding geometric figure according to the fixed size described in step (2), and use the geometric figure as the reference surface of the modeling size to scale the photo described in step (3), and the scaled photo matches the reference surface of the modeling size, Establishing a three-dimensional model of the proposed building site based on the scaled photos; (6) Based on the three-dimensional model described in step (5), a building elevation survey drawing of the proposed building site is generated.

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