CN114840901A - Real estate mapping method based on AR - Google Patents
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Abstract
The invention discloses an AR-based real estate mapping method, which comprises the following steps of S1: shooting house graphs through an AR, and automatically distinguishing the ground and the wall; s2: randomly selecting an initial anchor point A on the ground, and sending the initial anchor point A to perform edge drawing until the graph is closed to obtain a first graph; s3: calculating the angle between each edge and the X axis, and rotating the first graph according to the angle of the longest edge to enable the longest edge to be parallel to the X axis so as to obtain a second graph; s4: and zooming the second graph according to the zooming rate of the drawing interface and translating to a specified position to obtain a third graph, namely the drawn religious map. Automatically identifying the ground and the wall surface through the AR, and drawing the sides of the house by utilizing the AR, thereby quickly acquiring a first graph; and then, the angle of the first graph is adjusted, so that the drawing precision is improved, and the land parcel map with higher precision is obtained.
Description
Technical Field
The invention relates to the technical field of real estate surveying and mapping, in particular to an AR-based real estate surveying and mapping method.
Background
The AR is matched with a proper image or video through the observation of different angles and the position of an image on a computer, and the technology aims to put the image on a screen, so that people can clearly see how things in a virtual world are displayed in a real environment.
Real estate mapping is the measurement and mapping of property that is immovable by law for land, houses, etc., where cadastral mapping and real estate mapping are the main tasks in real estate mapping. Along with the technical development of surveying and mapping management work, the precision requirement of real estate surveying and mapping results is gradually improved, and on the premise of meeting real estate registration drawings, tables and books, the accurate dropping of real estate parcel graphics is further required.
The parcel map drawing in the real estate registration can clearly reflect the real estate situation. The real estate registration land parcel map not only guarantees the relative rights and interests of the house rights and interests, but also facilitates the understanding of the current situation of the house rights of the relative interest and interests. The method has the advantages that the house registration behavior is standardized, the house registration of a registration organization can be accurately carried out in the house registration practice, the safety of house transaction between parties is favorably maintained, the legal rights and interests of right-holders are protected, and the method plays an important role in the rapid development of real estate markets in China, the simplification of the legal relationship and the complication of the right-holder relationship of real estate transaction, the improvement of the registration legal system and the maintenance of the legal rights and interests of the parties. Compared with a land parcel sketch, the drawing of the real estate registration land parcel map has legal effectiveness, can clarify ownership problems, and is convenient for developing daily cadastral investigation and management work.
The real estate registration method is various, and the drawing method of the parcel map clearly reflects the real estate situation. The real estate registration land parcel map guarantees the rights of the house rights and interests, and facilitates understanding of the current situation of the house rights of the related seriously related persons. Because most houses built in rural areas at present are in irregular graphs such as trapezoids, diamonds and triangles, the difficulty of drawing a map by operators is increased when real estate is registered, and meanwhile, the situation that the measured and calculated area is not consistent with the actual graph area is difficult to avoid. Therefore, when drawing a block map, on one hand, the accuracy of drawing an irregular house type map needs to be improved as much as possible, and on the other hand, the difficulty of drawing the block map on site by an operator needs to be reduced.
Disclosure of Invention
Aiming at the problem that the accuracy of drawing a land parcel map of an irregular house type is reduced in the prior art, the invention provides an AR-based real estate surveying and mapping method, wherein the ground and the wall surface are automatically identified through an AR, and the edge of a house is drawn by utilizing the AR, so that a first graph is quickly obtained; and then, the drawing precision is improved by adjusting the angle of the first graph.
In order to achieve the purpose, the invention provides the following technical scheme:
an AR-based real estate mapping method comprising the steps of:
s1: shooting house graphs through an AR, and automatically distinguishing the ground and the wall;
s2: randomly selecting an initial anchor point A on the ground, and sending the initial anchor point A to perform edge drawing until the graph is closed to obtain a first graph;
s3: calculating the angle between each edge and the X axis, and rotating the first graph according to the angle of the longest edge to enable the longest edge to be parallel to the X axis so as to obtain a second graph;
s4: and zooming the second graph according to the zooming rate of the drawing interface and translating to a specified position to obtain a third graph, namely the drawn real estate map.
Preferably, in S1, the AR is an AR Engine, which has a plane recognition function and can automatically determine whether the graph is a horizontal plane or a vertical plane, and mark the horizontal plane as a ground plane and the vertical plane as a wall plane.
Preferably, in S2, the edge-mapping process includes angle calibration, including:
comparing an included angle a between the adjacent upper edge and the lower edge with a plurality of preset angles to obtain a difference angle, if the difference angle is within an error range, keeping the upper edge still, and rotating the difference angle by taking the connecting point as a base point on the lower edge to enable the included angle between the upper edge and the lower edge to be a preset angle; if the difference angle exceeds the error range, the included angle is kept unchanged.
Preferably, the plurality of preset angles includes 30, 45, 60, 90, 120, 150.
Preferably, in S2, the method for determining whether the first graph is closed includes:
the origin A has the coordinate of (x) 1 ,y 1 ) The endpoint N coordinate is (x) n ,y n ) Then the distance between the starting point and the end point is d:
when D is less than or equal to D, the first graph is considered to be closed; when D is more than D, the first graph is not closed and needs to be drawn again; d represents a preset judgment distance.
Preferably, D is 0.3 m.
Preferably, the S3 includes the steps of:
s3-1: calculating the angle between each edge and the X axis, wherein the first edge starting point A is (X) 1 ,y 1 ) The end point B coordinate is (x) 2 ,y 2 ) Then the angle between the first edge and the X-axis is beta 1 :
By analogy, the angles of the other edges to the X-axis can be obtained, and thus the angle set β ═ β of each edge to the X-axis in the first graph can be obtained 1 ,β 2 ,...,β n }；
S3-2: then, taking the surplus of each parameter in the angle set beta and 90 degrees, classifying the edges with the same surplus angle to obtain the class with the largest number of edges, and calculating the length of each edge to obtain the longest edge;
s3-3: and taking the angle of the longest edge as an adjusting angle, and clockwise rotating the first graph by taking the end point of the longest edge as a base point to adjust the angle so as to obtain a second graph.
Preferably, in S4, the zoom ratio is X dpi 5.08, xdpi denotes the drawing interface pixel.
In summary, due to the adoption of the technical scheme, compared with the prior art, the invention at least has the following beneficial effects:
automatically identifying the ground and the wall surface through the AR, and drawing the sides of the house by utilizing the AR, thereby quickly acquiring a first graph; and then, angle adjustment is carried out on the first graph, and a second graph is obtained on a drawing interface, so that a high-precision land parcel map is obtained.
Description of the drawings:
FIG. 1 is a schematic diagram of an AR-based real estate mapping method according to an exemplary embodiment of the present invention.
Fig. 2 is a first graphical illustration based on AR rendering according to an exemplary embodiment of the invention.
Fig. 3 is a diagram illustrating a second graph after being adjusted based on a first graph according to an exemplary embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples and embodiments. It should be understood that the scope of the above-described subject matter of the present invention is not limited to the following examples, and any technique realized based on the contents of the present invention is within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
As shown in fig. 1, the present invention provides an AR-based real estate mapping method, which specifically includes the following steps:
s1: shoot the house figure through AR, distinguish ground and wall automatically.
In this embodiment, the AR software may adopt an AR Engine, and the AR software has a plane recognition function, and can automatically determine whether the graph is a horizontal plane or a vertical plane, mark the horizontal plane as a ground surface, and mark the vertical plane as a wall surface.
S2: an initial anchor point is arbitrarily selected, and drawing of the graph is carried out from the initial anchor point until the initial anchor point is closed, so that the first graph is obtained.
In this embodiment, as shown in fig. 2, after the initial anchor point is set, the AR software (with its own coordinate system) automatically records the coordinate (x) of the anchor point a 1 ,y 1 ) Using Y for subsequent drawing of graphics 1 Value, ensure that the drawn figure is on a horizontal plane.
In this embodiment, when the graph is drawn, the angles of the two adjacent sides may be irregular due to external factors (such as jitter), and therefore, the angles need to be calibrated for calculation.
The method for calibrating the angle between the two adjacent sides comprises the following steps:
and calculating an included angle a between two adjacent sides (an upper side and a lower side) through a trigonometric function, and comparing the included angle a with a plurality of preset angles to obtain a difference angle. If the difference angle is within an error range (within plus or minus 3 degrees), keeping the upper edge still, and rotating the lower edge by taking the connecting point as a base point to enable the included angle between the two adjacent edges to be a preset angle, so that the subsequent calculation and the attractiveness are facilitated; if the difference angle exceeds plus or minus 3 degrees, the included angle is kept unchanged.
In this embodiment, the plurality of preset angles includes 30, 45, 60, 90, 120, and 150. For example, if the angle a between the upper side and the lower side is 62, then the difference angles are 32, 17, 2, -28, -58, -88, wherein 2 is less than 3 (error range), that is, the difference angles are within the error range, then the lower side is rotated by 2 degrees, so that the angle a between the upper side and the lower side is 60 degrees.
In this embodiment, in the process of drawing the graph, because there may be an error due to an external factor, that is, the end point may not completely coincide with the start point, the first graph may be considered to be closed as long as the distance error between the end point and the start point is within a certain range.
For example, the starting point A of the first graph is the initial anchor point, and the coordinates of the starting point A are (x) 1 ,y 1 ) The endpoint N coordinate is (x) n ,y n ) Then the starting point and the end pointThe distance between d:
when D is less than or equal to D, the first graph is considered to be closed; when D > D, the first graph is not closed and needs to be redrawn, repeating S1 and S2. Preferably, D is 0.3 m.
S3: since only the coordinates of the first figure and each side connecting the line are obtained by AR mapping, the coordinate system of the plane and the coordinate system of the flat plate are not coincident, and therefore, coordinate conversion is required.
In this embodiment, as shown in fig. 2, the first graph is formed by connecting a plurality of edges, so that the angle between each edge and the X-axis needs to be calculated first, for example, the starting point a of the first edge is (X) 1 ,y 1 ) The end point B coordinate is (x) 2 ,y 2 ) The angle between the first side and the X-axis is beta 1 :
By analogy, the angles of the other edges to the X-axis can be obtained, and thus the angle set β ═ β of each edge to the X-axis in the first graph can be obtained 1 ,β 2 ,...,β n }；
The method comprises the steps of obtaining a surplus angle by subtracting each angle in an angle set beta from 90 degrees, obtaining the surplus angle by classifying the edges with the same surplus angle (normally, the edges with the same surplus result are certainly parallel to each other, if a user draws a picture, the user can calibrate the angle in advance when drawing the picture even if the user does not have a specific picture, if the user has the picture, the picture can be a more regular picture), obtaining the class with the largest number of the edges, calculating the length of each edge to obtain the longest edge, and obtaining the angle between the longest edge and the X axis (for example, beta is an angle between the longest edge and the X axis) 1 ) For angle adjustment, the first pattern is rotated clockwise by an adjustment angle, e.g. by β, using the end point of the longest side as a base point 1 Thereby obtaining a second pattern as shown in fig. 3.
Calculation of the edge Length takes the first edge as an example, and the starting point A of the first edge is (x) 1 ,y 1 ) The end point B coordinate is (x) 2 ,y 2 ) Then length L1 is calculated as:
in this embodiment, for example, if the longest edge found is the first edge, the first graph is rotated by the adjustment angle β at the end point B of the first edge 1 。
Finally, the zoom ratio (X) of the drawing interface is used dpi 5.08), zooming the adjusted second graph and translating to a specified position (a display area set for a drawing interface) to obtain a third graph, namely drawing a required religion map.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (8)
1. An AR-based real estate mapping method, comprising the steps of:
s1: shooting house graphs through an AR, and automatically distinguishing the ground and the wall;
s2: randomly selecting an initial anchor point A on the ground, and sending the initial anchor point A to perform edge drawing until the graph is closed to obtain a first graph;
s3: calculating the angle between each edge and the X axis, and rotating the first graph according to the angle of the longest edge to enable the longest edge to be parallel to the X axis so as to obtain a second graph;
s4: and zooming the second graph according to the zooming rate of the drawing interface and translating to a specified position to obtain a third graph, namely the drawn real estate map.
2. The AR-based real estate mapping method of claim 1 wherein in S1, AR is AR Engine, having a plane recognition function, capable of automatically determining whether a graph is a horizontal plane or a vertical plane, and marking the horizontal plane as a ground plane and the vertical plane as a wall plane.
3. The AR-based real estate mapping method of claim 1 wherein said S2 edge mapping process includes angle calibration including:
comparing an included angle a between the adjacent upper edge and the lower edge with a plurality of preset angles to obtain a difference angle, if the difference angle is within an error range, keeping the upper edge still, and rotating the difference angle by taking the connecting point as a base point on the lower edge to enable the included angle between the upper edge and the lower edge to be a preset angle; if the difference angle exceeds the error range, the included angle is kept unchanged.
4. The AR-based real estate mapping method of claim 3 wherein said plurality of preset angles comprises 30, 45, 60, 90, 120, 150.
5. The AR-based real estate mapping method of claim 1, wherein in S2, the method for determining whether the first graph is closed includes:
the origin A has the coordinate of (x) 1 ,y 1 ) The endpoint N coordinate is (x) n ,y n ) Then the distance between the starting point and the end point is d:
when D is less than or equal to D, the first graph is considered to be closed; when D is more than D, the first graph is not closed and needs to be drawn again; d represents a preset judgment distance.
6. The AR-based real estate mapping method of claim 5 wherein D is 0.3 m.
7. The AR-based real estate mapping method of claim 1 wherein said S3 comprising the steps of:
s3-1: calculating the angle between each edge and the X axis, wherein the first edge starting point A is (X) 1 ,y 1 ) The end point B coordinate is (x) 2 ,y 2 ) The angle between the first edge and the X-axis is beta 1 :
By analogy, the angles of the other edges to the X-axis can be obtained, and thus the angle set β ═ β of each edge to the X-axis in the first graph can be obtained 1 ,β 2 ,...,β n }；
S3-2: then, each parameter in the angle set beta is subjected to complementation with 90 degrees, the edges with the same complementation angle are classified, the class with the largest number of edges can be obtained, and the length of each edge is calculated to obtain the longest edge;
s3-3: and taking the angle of the longest edge as an adjusting angle, and clockwise rotating the first graph by taking the end point of the longest edge as a base point to adjust the angle so as to obtain a second graph.
8. The AR-based real estate mapping method of claim 1 wherein in S4, the zoom ratio is X dpi 5.08, xdpi denotes the drawing interface pixel.
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