Method and system for drawing house graph based on laser RTK

Abstract

The invention discloses a method and system for drawing a house graph based on laser RTK, and the method specifically comprises the following steps: S1, measuring a first inflection point P1 of a house through the laser RTK, and then drawing a first drawing point T1 corresponding to the first inflection point P1 at a mobile terminal; s2, measuring a second inflection point P2 adjacent to the P1 by using laser RTK, and judging whether a corresponding coordinate point can be obtained or not; if yes, directly acquiring the coordinate of a second inflection point P2, and entering S5; if not, entering S3; s3, moving the laser RTK on a connecting line of the first inflection point P1 and the second inflection point P2 to obtain a first position point P, 2 of a coordinate measured and obtained by the laser RTK; then measuring a first distance L1 from the first inflection point P1 to the second inflection point P2, and calculating a second distance L2 from the first inflection point P1 to the first position point P, 2, thereby calculating a length adjustment proportion; s4, calculating the coordinate of the second inflection point corresponding to the second drawing point T2 on the mobile terminal according to the length adjustment proportion and the drawing proportion; s5, calculating the coordinates of a corresponding second drawing point T2 according to the coordinates of the second inflection point P2; and S6, measuring other inflection points of the house by using the laser RTK, and repeating the steps S2 to S5.

Description

Technical Field

[0001] The present invention relates to the field of real estate technology, and in particular to a method and system for drawing house graphics based on laser RTK. Background Art

[0002] With the continuous development of the national surveying and mapping field, the confirmation of real estate rights is becoming more and more accurate, requiring precise house dimensions.

[0003] However, in the past, for real estate confirmation, staff were required to first conduct on-site surveying and collect relevant coordinate data. If a special-shaped house is encountered, its angle is irregular. The existing method is generally to judge whether the corner of the house is a right angle by naked eyes (when designing a house, many turning points are usually designed as right angles, and non-right angles are usually errors in construction. In the actual surveying process, this angle error is usually ignored, which is also a prerequisite for angle judgment in the present invention), draw the outline of the house on the sketch, and then use distance measuring equipment (laser rangefinder, tape measure) to obtain the length of each side.

[0004] For houses with only one non-right angle, they can be accurately drawn through the relationship of triangles. However, for houses with multiple non-right angles, only figures with consistent lengths can be drawn, and finally two rtk points are measured to assign the final spatial coordinates. This method requires field surveying and mapping, and then returning to the office to use CAD for mapping. It is inefficient and cannot produce results on site. Subsequent business requires multiple round trips to the site. Summary of the invention

[0005] In view of the problem of low angle measurement accuracy of special-shaped houses in the prior art, the present invention proposes a method and system for drawing house graphics based on laser RTK, which uses laser RTK to perform distance measurement and coordinate measurement, solves the house measurement method of various angles of special-shaped houses, and realizes rapid mapping of special-shaped houses.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A method for drawing house graphics based on laser RTK, specifically comprising the following steps:

[0008] S1: Use laser RTK to measure the first turning point P of the house 1 , and then draw the first inflection point P on the mobile terminal 1 The corresponding first plotted point T 1 ;

[0009] S2: Using Laser RTK to measure and 1 The adjacent second inflection point P 2 , determine whether the corresponding coordinate point can be obtained; if so, directly obtain the second inflection point P2 , and enter S5; if not, enter S3;

[0010] S3: Set the laser RTK at the first turning point P 1 and the second inflection point P 2 Move on the connecting line to obtain the first position point P obtained by laser RTK measurement. 2 ; Then measure the first inflection point P 1 To the second turning point P 2 The first distance L 1 , calculate the first inflection point P 1 With the first position point P, 2 The second distance L 2 , thereby calculating the length adjustment ratio;

[0011] S4: Calculate the second inflection point corresponding to the second drawing point T on the mobile terminal according to the length adjustment ratio and the drawing ratio 2 The coordinates of

[0012] S5: According to the second inflection point P 2 The coordinates of the second plotted point T are calculated 2 coordinate;

[0013] S6: Use laser RTK to measure other turning points of the house and repeat S2-S5.

[0014] Preferably, in S1, the first inflection point P of the house 1 and the first plotted point T 1 There is a translation of the plot:

[0015] M x =X 1 -X t1 ,M y =Y 1 -Y t1 (1)

[0016] In formula (1), M x represents the translation in the X direction; y represents the translation in the Y direction; (X 1 ,Y 1 ) represents the first inflection point P 1 The coordinates of (X t1 ,Y t1 ) represents a plotted point T 1 The coordinates of .

[0017] Preferably, in S2, the method for determining whether the corresponding coordinate point can be obtained is:

[0018] When using laser RTK to measure the second inflection point P 2If a fixed solution is displayed, it means that the corresponding coordinates can be directly obtained. If no fixed solution is displayed, it means that the corresponding coordinates cannot be obtained using laser RTK.

[0019] Preferably, in S3, the length adjustment ratio calculation formula is:

[0020]

[0021] In formula (2), SL represents the length adjustment ratio; L 1 Indicates the first inflection point P 1 To the second turning point P 2 The first distance; L 2 Indicates the first inflection point P 1 To the first position point P, 2 The second distance of

[0022]

[0023] In formula (3), (X 1 ,Y 1 ) represents the first inflection point P 1 The coordinates of (X, 2 ,Y, 2 ) represents the first position point P, 2 The coordinates of .

[0024] Preferably, the S4 includes:

[0025] S4-1: Calculate the first position point P respectively, 2 With the first inflection point P 1 The first difference between the X and Y axes:

[0026] X, c =X, 2 -X 1 , Y, c =Y, 2 -Y 1 (4)

[0027] In formula (4), X, c represents the first position point P, 2 (X, 2 ,Y, 2 ) and the first inflection point P 1 (X 1 ,Y 1 ) on the first difference of the X axis; Y, c represents the first position point P, 2 (X, 2 ,Y, 2 ) and the first inflection point P 1 (X 1,Y 1 ) on the Y axis;

[0028] S4-2: Calculate the second inflection point P according to the length adjustment ratio and the first difference 2 With the first inflection point P 1 The second difference between the X and Y axes of a point:

[0029] X pc =SL*X, c , Y pc =SL*Y, c (5)

[0030] In formula (5), X pc Indicates the second inflection point P 2 With the first inflection point P 1 (X 1 ,Y 1 ) on the X axis; Y pc Indicates the second inflection point P 2 With the first inflection point P 1 (X 1 ,Y 1 ) on the Y axis;

[0031] S4-3: Calculate the second inflection point P according to the second difference 2 (X 2 ,Y 2 )’s coordinates:

[0032] X 2 =X 1 +X pc , Y 2 =Y 1 +Y pc (6)

[0033] In formula (6), X 2 Indicates the second inflection point P 2 The X-axis coordinate of 2 Indicates the second inflection point P 2 The Y-axis coordinate of

[0034] S4-4: Calculate the second inflection point P according to the drawing ratio 2 The second drawing point T corresponding to the mobile terminal 2 (X t2 ,Y t2 )coordinate:

[0035] X t2 =X pc *scale+X 1 , Y t2 =Y pc *scale+Y1 (7)

[0036] In formula (7), X t2 Indicates the second plot point T 2 The X-axis coordinate of t2 Indicates the second plot point T 2 The Y-axis coordinate of ; scale indicates the drawing scale, scale = xdpi / 5.08, and xdpi indicates the resolution of the mobile terminal.

[0037] Preferably, the S5 includes:

[0038] According to the second inflection point P 2 (X 2 ,Y 2 ) coordinates, calculate the second inflection point P 2 With the first inflection point P 1 The third difference between the X and Y axes:

[0039] X c =X 2 -X 1 , Y c =Y 2 -Y 1 (8)

[0040] In formula (8), X c Indicates the second inflection point P 2 With the first inflection point P 1 The third difference on the X axis; Y c Indicates the second inflection point P 2 With the first inflection point P 1 The third difference on the Y axis;

[0041] Calculate the second inflection point P 2 The second drawing point T corresponding to the mobile terminal 2 (X t2 ,Y t2 )coordinate:

[0042] X t2 =X c *scale+X 1 , Y t2 =Y c *scale+Y 1 (9)

[0043] In formula (9), X t2 Indicates the second plot point T 2 The X-axis coordinate of t2 Indicates the second plot point T 2 The Y-axis coordinate of .

[0044] Preferably, the method further comprises S7:

[0045] When RTK is used to measure the second inflection point P 2 The adjacent third inflection point P 3 , if P 3 P 2 P 1 The angle w formed is a right angle, so let the third inflection point P 3 Rao second turning point P 2 Rotate clockwise and calculate the third inflection point P 3 (X 3 ,Y 3 )’s coordinates:

[0046] radian = 90*PI / 180;

[0047] X 3 =(X 2 -X 1 )*cos(radian)-(Y 2 -Y 1 )*sin(radian)+X 1 ; (10)

[0048] Y 3 =(Y 2 -Y 1 )*sin(radian)-(Y 2 -Y 1 )*cos(radian)+Y 1 ;

[0049] In formula (10), radian represents the third inflection point P 3 Rao second turning point P 2 The radian value of rotation; PI stands for pi π;

[0050] Then calculate the third inflection point P 3 and the second inflection point P 2 The fourth difference between the X and Y axes:

[0051] X 4c =X 3 -X 2 , Y 4c =Y 3 -Y 2 (11)

[0052] In formula (11), X 4c Indicates the third inflection point P 3 and the second inflection point P 2 The third difference on the X axis; Y 4c Indicates the third inflection point P 3and the second inflection point P 2 The third difference on the Y axis;

[0053] Calculate the third drawing point T corresponding to the third inflection point on the mobile terminal 3 (X t3 ,Y t3 )coordinate:

[0054] X t3 =X 4c *scale+X 3 , Y t3 =Y 4c *scale+Y 3 (12)

[0055] In formula (12), X t3 Indicates the third plot point T 3 The X-axis coordinate of t3 Indicates the third plot point T 3 The Y-axis coordinate of .

[0056] The present invention also provides a system for drawing house graphics based on laser RTK, wherein a mobile terminal and the laser RTK are connected wirelessly or by wire;

[0057] Laser RTK, used to measure the coordinates and distances of the house’s turning points;

[0058] The mobile terminal is used to draw house graphics in real time based on the house turning points.

[0059] Preferably, the mobile terminal includes a drawing module, a ratio calculation module and a coordinate conversion module;

[0060] Drawing module, used to draw points and lines on the mobile terminal;

[0061] A ratio calculation module, used to calculate the length adjustment ratio and drawing ratio;

[0062] The coordinate conversion module is used to calculate the coordinates of the house turning points and the coordinates of the corresponding drawing points.

[0063] Preferably, the mobile terminal is equipped with a distance sensor and an inclination sensor, which can be used to detect distance and angle.

[0064] In summary, due to the adoption of the above technical solution, compared with the prior art, the present invention has at least the following beneficial effects:

[0065] The present invention uses the mobile terminal as a carrier for drawing graphics to perform real-time drawing of houses and solves the problem of angle measurement, truly realizing the integration of indoor and outdoor work, and quickly outputting on-site results, effectively improving the efficiency of house measurement and shortening the business processing cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 The figure is a schematic diagram of a method for drawing house graphics based on laser RTK according to an exemplary embodiment of the present invention. Figure 2 Schematic diagram of laser RTK coordinate points according to an exemplary embodiment of the present invention. Figure 3 Schematic diagram of the angle according to an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0067] The present invention is further described in detail below in conjunction with the examples and specific implementation methods. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following examples, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0068] In the description of the present invention, it is necessary to understand that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0069] like Figure 1 As shown, the present invention provides a method for drawing house graphics based on laser RTK, which specifically includes the following steps:

[0070] S1: Use laser RTK to measure the first turning point P of the house 1 (X 1 ,Y 1 )(X 1 ,Y 1 can be directly obtained by laser RTK), and then draw the first turning point P at the starting point preset on the mobile terminal. 1 The corresponding first plotted point is denoted as T 1 (X t1 ,Y t1 ).

[0071] In this embodiment, the first inflection point P 1 The requirement is that the points must meet the measurement conditions, that is, there must be satellite signals and meet the requirements for marking points, that is, the device screen shows the state of being able to mark points. The mobile terminal (wireless / wired connection with laser RTK) will automatically receive the marking coordinates of the laser RTK and complete the drawing of the first drawing point without manual operation.

[0072] In this embodiment, the actual turning point P of the house 1 And mobile terminal starting point T 1There is a translation of the plot:

[0073] M x =X 1 -X t1 ,M y =Y 1 -Y t1 (1)

[0074] In formula (1), M x represents the translation in the X direction; y represents the translation in the Y direction.

[0075] S2: Using Laser RTK to measure and 1 The adjacent second inflection point P 2 , determine whether the corresponding coordinate point can be obtained; if so, directly obtain the second inflection point P 2 coordinates and enter S5; otherwise enter S3.

[0076] In this embodiment, when the laser RTK is used to measure the second inflection point P 2 If a fixed solution is displayed, it means that the corresponding coordinates can be directly obtained. If no fixed solution is displayed, it means that the corresponding coordinates cannot be obtained using laser RTK.

[0077] S3: Figure 2 As shown, the laser RTK is placed at the first turning point P 1 and the second inflection point P 2 By moving on the line of , we can get the first position point P obtained by laser RTK measurement. 2 (X, 2 ,Y, 2 );Then measure the first inflection point P 1 To the second turning point P 2 The first distance L 1 (obtained by direct measurement of laser RTK), the mobile terminal obtains the first distance L through Bluetooth and other communications 1 , calculate P 1 With P, 2 The second distance L 2 : , and thus calculate the length adjustment ratio:

[0078]

[0079] In formula (2), SL represents the length adjustment ratio; L 1 Indicates the first inflection point P 1 To the second turning point P 2 The first distance; L 2 Indicates the first inflection point P 1 To the first position point P, 2 The second distance.

[0080] S4: Calculate the coordinates of the second point corresponding to the second inflection point on the mobile terminal according to the length adjustment ratio and the drawing ratio.

[0081] S4-1: Calculate the first position point P respectively, 2 With the first inflection point P 1 The first difference between the X and Y axes:

[0082] X, c =X, 2 -X 1 , Y, c =Y, 2 -Y 1 (3)

[0083] In formula (3), X, c represents the first position point P, 2 (X, 2 ,Y, 2 ) and the first inflection point P 1 (X 1 ,Y 1 ) on the first difference of the X axis; Y, c represents the first position point P, 2 (X, 2 ,Y, 2 ) and the first inflection point P 1 (X 1 ,Y 1 ) on the Y-axis.

[0084] S4-2: Calculate the second inflection point P according to the length adjustment ratio and the first difference 2 With the first inflection point P 1 The second difference between the X and Y axes of a point:

[0085] X pc =SL*X, c , Y pc =SL*Y, c (4)

[0086] In formula (4), X pc Indicates the second inflection point P 2 With the first inflection point P 1 (X 1 ,Y 1 ) on the X axis; Y pc Indicates the second inflection point P 2 With the first inflection point P 1 (X 1 ,Y 1 ) on the Y-axis.

[0087] S4-3: Calculate the second inflection point P according to the second difference 2 (X 2 ,Y 2 )’s coordinates:

[0088] X 2 =X 1 +X pc , Y 2 =Y 1 +Y pc (5)

[0089] In formula (5), X 2 Indicates the second inflection point P 2 The X-axis coordinate of 2 Indicates the second inflection point P 2 The Y-axis coordinate of .

[0090] S4-4: Calculate the second inflection point P according to the drawing ratio 2 The second drawing point T corresponding to the mobile terminal 2 (X t2 ,Y t2 )coordinate:

[0091] X t2 =X pc *scale+X 1 , Y t2 =Y pc *scale+Y 1 (6)

[0092] In formula (6), X t2 Indicates the second plot point T 2 The X-axis coordinate of t2 Indicates the second plot point T 2 The Y-axis coordinate of .

[0093] In order to ensure that the distance between the point on the screen and the actual inflection point meets the requirement of 1:200, the actual drawn graphics ratio is scale=xdpi / 5.08; wherein scale represents the drawing ratio; xdpi represents the resolution of the mobile terminal; and can be obtained through the API provided by the corresponding operating system.

[0094] S5: In this embodiment, if the second inflection point P 2 Laser RTK measurement can be used, and the second turning point P can be measured. 2 The actual coordinates (X 2 ,Y 2 );Calculate the second inflection point P 2 With the first inflection point P 1 The third difference between the X and Y axes:

[0095] Xc =X 2 -X 1 , Y c =Y 2 -Y 1 (7)

[0096] In formula (7), X c Indicates the second inflection point P 2 With the first inflection point P 1 (X 1 ,Y 1 ) on the third difference of the X axis; Y c Indicates the second inflection point P 2 With the first inflection point P 1 (X 1 ,Y 1 ) on the Y-axis.

[0097] Calculate the second inflection point P 2 The second drawing point T corresponding to the mobile terminal 2 (X t2 ,Y t2 )coordinate:

[0098] X t2 =X c *scale+X 1 , Y t2 =Y c *scale+Y 1 (8)

[0099] In formula (8), X t2 Indicates the second plot point T 2 The X-axis coordinate of t2 Indicates the second plot point T 2 The Y-axis coordinate of .

[0100] In order to ensure that the distance between the point on the screen and the actual inflection point meets the requirement of 1:200, the actual drawn graphics ratio is scale=xdpi / 5.08; wherein scale represents the drawing ratio; xdpi represents the resolution of the mobile terminal; and can be obtained through the API provided by the corresponding operating system.

[0101] S6: Use laser RTK to measure other turning points and repeat S2-S5.

[0102] In this embodiment, S7 is also included:

[0103] According to the actual operation standards, if laser RTK is used for measurement, the efficiency will be lower, while the coordinate calculation method of right angle plus length will be more efficient, and there is no need to wait for laser RTK to obtain a fixed solution (which requires a certain amount of time for calculation).

[0104] like Figure 3 As shown, using RTK measurement and the second inflection point P 2 The adjacent third inflection point P 3 , judge P 3 P 2 P 1 Is the angle w formed a right angle (in this embodiment, the mobile terminal is equipped with a distance sensor and an inclination sensor, which can be used to detect the distance and angle.) If the third inflection point P 3 Around the second turning point P 2 Rotate 90 degrees clockwise (-90 degrees counterclockwise) and calculate the third inflection point P 3 (X 3 ,Y 3 )’s coordinates:

[0105] radian = 90*PI / 180;

[0106] X 3 =(X 2 -X 1 )*cos(radian)-(Y 2 -Y 1 )*sin(radian)+X 1 ; (9)

[0107] Y 3 =(Y 2 -Y 1 )*sin(radian)-(Y 2 -Y 1 )*cos(radian)+Y 1 ;

[0108] In formula (9), radian represents the third inflection point P 3 Around the second turning point P 2 The value of rotation in radians; PI stands for pi, π.

[0109] Then calculate the third inflection point P 3 and the second inflection point P 2 The fourth difference between the X and Y axes:

[0110] X 4c =X 3 -X 2 , Y 4c =Y 3 -Y 2 (10)

[0111] In formula (10), X 4c Indicates the third inflection point P 3 and the second inflection point P2 The third difference on the X axis; Y 4c Indicates the third inflection point P 3 and the second inflection point P 2 The third difference on the Y axis.

[0112] Calculate the third drawing point T corresponding to the third inflection point on the mobile terminal 3 (X t3 ,Y t3 )coordinate:

[0113] X t3 =X 4c *scale+X 3 , Y t3 =Y 4c *scale+Y 3 (11)

[0114] In formula (11), X t3 Indicates the third plot point T 3 The X-axis coordinate of t3 Indicates the third plot point T 3 The Y-axis coordinate of .

[0115] Due to the current surveying and mapping, all judgments are done manually. When a house is redesigned, it is usually assumed that some corners are right angles. Judging by three points of the house, the error is usually within 1°. However, errors may exist during the wall construction process, so surveyors can directly judge the angles.

[0116] Compared with traditional surveying and mapping methods, the present invention combines satellite positioning technology with a fast drawing method. On the basis of maintaining the fast drawing of simple graphics, it realizes the fast drawing of complex graphics and house graphics under various angle conditions. At the same time, the present invention uses the equipment to map the actual environment. Users do not need to construct a spatial structure in their minds, but only need to use the equipment to operate, which greatly reduces the difficulty of surveying and mapping.

[0117] Based on the above method, the present invention also provides a system for drawing house graphics based on laser RTK, including laser RTK and a mobile terminal, and the mobile terminal and the laser RTK are wirelessly / wired connected.

[0118] Laser RTK, used to measure the coordinates and distances of the house’s turning points;

[0119] The mobile terminal is used to draw house graphics in real time based on the house turning points.

[0120] In this embodiment, the mobile terminal includes a drawing module, a ratio calculation module and a coordinate conversion module.

[0121] Drawing module, used to draw points and lines on the mobile terminal;

[0122] A ratio calculation module, used to calculate the length adjustment ratio and drawing ratio;

[0123] The coordinate conversion module is used to calculate the coordinates of the house turning points and the coordinates of the corresponding drawing points.

[0124] In this embodiment, a distance sensor and an inclination sensor are installed on the mobile terminal, which can be used to detect distance and angle.

[0125] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A method for drawing house graphics based on laser RTK, characterized in that: The specific steps include: S1: Use laser RTK to measure the first turning point P1 of the house, and then draw the first drawing point T1 corresponding to the first turning point P1 on the mobile terminal; S2: Use laser RTK to measure the second inflection point P2 adjacent to P1, and determine whether the corresponding coordinate point can be obtained; if so, directly obtain the coordinates of the second inflection point P2 and enter S5; if not, enter S3; S3: Move the laser RTK on the line connecting the first inflection point P1 and the second inflection point P2 to obtain the first position point P,2 whose coordinates are obtained by laser RTK measurement; then measure the first distance L1 from the first inflection point P1 to the second inflection point P2, calculate the second distance L2 between the first inflection point P1 and the first position point P,2, and thus calculate the length adjustment ratio; S4: Calculate the coordinates of the second inflection point corresponding to the second drawing point T2 on the mobile terminal according to the length adjustment ratio and the drawing ratio; S5: Calculate the coordinates of the corresponding second drawing point T2 according to the coordinates of the second inflection point P2; S6: Use laser RTK to measure other turning points of the house and repeat S2-S5.

2. The method for drawing house graphics based on laser RTK according to claim 1, characterized in that: In S1, there is a translation of the drawing between the first turning point P1 and the first drawing point T1 of the house: M x =X1-X t1 ,M y =Y1-Y t1 (1) In formula (1), M x represents the translation in the X direction; y represents the translation in the Y direction; (X1, Y1) represents the coordinates of the first inflection point P1; (X t1 ,Y t1 ) represents the coordinates of a plotted point T1.

3. The method for drawing house graphics based on laser RTK as claimed in claim 1, characterized in that: In S2, the method for determining whether the corresponding coordinate point can be obtained is: When using laser RTK to measure the second inflection point P2, if a fixed solution is displayed, it means that the corresponding coordinates can be directly obtained. If a fixed solution is not displayed, it means that the corresponding coordinates cannot be obtained using laser RTK.

4. The method for drawing house graphics based on laser RTK according to claim 1, characterized in that: In S3, the length adjustment ratio calculation formula is: In formula (2), SL represents the length adjustment ratio; L1 represents the first distance from the first inflection point P1 to the second inflection point P2; L2 represents the second distance from the first inflection point P1 to the first position point P,2; wherein, In formula (3), (X1, Y1) represents the coordinates of the first inflection point P1; (X, 2, Y, 2) represents the coordinates of the first position point P, 2.

5. The method for drawing house graphics based on laser RTK according to claim 1, characterized in that: The S4 includes: S4-1: Calculate the first difference between the first position point P,2 and the first inflection point P1 on the X-axis and Y-axis respectively: X, c =X,2-X1,Y, c =Y,2-Y1 (4) In formula (4), X, c represents the first difference between the first position point P,2(X,2,Y,2) and the first inflection point P1(X1,Y1) on the X axis; Y, c It represents the first difference between the first position point P,2(X,2,Y,2) and the first inflection point P1(X1,Y1) on the Y axis; S4-2: Calculate the second difference between the second inflection point P2 and the first inflection point P1 on the X-axis and the Y-axis according to the length adjustment ratio and the first difference: X pc =SL*X, c ,AND pc =SL*Y, c (5) In formula (5), X pc represents the second difference between the second inflection point P2 and the first inflection point P1 (X1, Y1) on the X axis; Y pc represents the second difference between the second inflection point P2 and the first inflection point P1 (X1, Y1) on the Y axis; S4-3: Calculate the coordinates of the second inflection point P2 (X2, Y2) according to the second difference: X2=X1+X pc ,Y2=Y1+Y pc (6) In formula (6), X2 represents the X-axis coordinate of the second inflection point P2; Y2 represents the Y-axis coordinate of the second inflection point P2; S4-4: Calculate the second drawing point T2 (X) corresponding to the second inflection point P2 on the mobile terminal according to the drawing ratio t2 ,Y t2 )coordinate: X t2 =X pc *scale+X1,Y t2 =Y pc *scale+Y1 (7) In formula (7), X t2 represents the X-axis coordinate of the second plotting point T2; Y t2 represents the Y-axis coordinate of the second drawing point T2; scale represents the drawing scale, scale=xdpi / 5.08, and xdpi represents the resolution of the mobile terminal.

6. The method for drawing house graphics based on laser RTK according to claim 1, characterized in that: The S5 includes: According to the coordinates of the second inflection point P2 (X2, Y2), the third difference between the second inflection point P2 and the first inflection point P1 on the X-axis and the Y-axis is calculated: X c =X2-X1,Y c =Y2-Y1 (8) In formula (8), X c represents the third difference between the second inflection point P2 and the first inflection point P1 on the X axis; Y c represents the third difference between the second inflection point P2 and the first inflection point P1 on the Y axis; Calculate the second drawing point T2 (X t2 ,Y t2 )coordinate: X t2 =X c *scale+X1,Y t2 =Y c *scale+Y1 (9) In formula (9), X t2 represents the X-axis coordinate of the second plotting point T2; Y t2 Indicates the Y-axis coordinate of the second drawing point T2.

7. The method for drawing house graphics based on laser RTK according to claim 1, characterized in that: Also includes S7: When using RTK to measure the third inflection point P3 adjacent to the second inflection point P2, if the angle w formed by P3P2P1 is a right angle, let the third inflection point P3 rotate clockwise around the second inflection point P2, and calculate the coordinates of the third inflection point P3 (X3, Y3): radian = 90*PI / 180; X3=(X2-X1)*cos(radian)-(Y2-Y1)*sin(radian)+X1; (10) Y3=(Y2-Y1)*sin(radian)-(Y2-Y1)*cos(radian)+Y1; In formula (10), radian represents the radian value of the third inflection point P3 rotating around the second inflection point P2; PI represents pi; Then, the fourth difference between the third inflection point P3 and the second inflection point P2 on the X-axis and the Y-axis is calculated: X 4c =X3-X2,Y 4c =Y3-Y2 (11) In formula (11), X 4c represents the third difference between the third inflection point P3 and the second inflection point P2 on the X axis; Y 4c represents the third difference between the third inflection point P3 and the second inflection point P2 on the Y axis; Calculate the third drawing point T3 (X t3 ,Y t3 )coordinate: X t3 =X 4c *scale+X3,Y t3 =Y 4c *scale+Y3 (12) In formula (12), X t3 represents the X-axis coordinate of the third plotting point T3; Y t3 Indicates the Y-axis coordinate of the third drawing point T3.

8. A system for drawing house graphics based on laser RTK based on the method according to any one of claims 1 to 7, characterized in that: Including mobile terminal and laser RTK, mobile terminal and laser RTK wireless / wired connection; Laser RTK, used to measure the coordinates and distances of the house’s turning points; The mobile terminal is used to draw house graphics in real time based on the house turning points.

9. A system for drawing house graphics based on laser RTK as claimed in claim 8, characterized in that: The mobile terminal includes a drawing module, a ratio calculation module and a coordinate conversion module; Drawing module, used to draw points and lines on the mobile terminal; A ratio calculation module, used to calculate the length adjustment ratio and drawing ratio; The coordinate conversion module is used to calculate the coordinates of the house turning points and the coordinates of the corresponding drawing points.

10. The system for drawing house graphics based on laser RTK as claimed in claim 8, characterized in that: The mobile terminal is equipped with a distance sensor and an inclination sensor, which can be used to detect distance and angle.

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