CN108536647B - Method for searching land parcel four-to-four by adopting boundary points and 45-degree external rectangle - Google Patents
Method for searching land parcel four-to-four by adopting boundary points and 45-degree external rectangle Download PDFInfo
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Abstract
The invention discloses a method for searching land parcel four-to-four by adopting boundary points and a 45-degree external rectangle, which is characterized in that on the basis of land parcel, boundary points closest to four directions of southwest, southeast, northeast and northwest of land parcel are found by 45-degree separated external rectangles, 4 boundary points cut the boundary of land parcel to form four-section boundary distinguishing lines of east, west, south and north, topology searching is carried out based on the adjacent relation of land parcel, and the four-to-four attribute of land parcel can be more reasonably and completely determined. The method not only makes up the defects of the existing method at present, replaces manual judgment, greatly improves the efficiency of land parcel four-to-four searching, saves time and labor cost, but also has good accuracy of the four-to-four searching result and completely meets the requirement of land right confirmation.
Description
Technical Field
The invention relates to the technical field of basic geographic information data processing, in particular to a method for searching land parcel four-to-four by adopting boundary points and a 45-degree external rectangle.
Background
The land parcel refers to a closed land parcel consisting of ownership boundaries, and is a land parcel with a determined boundary and a determined ownership on the earth surface. The boundary point is a turning point of the boundary of the parcel location authority. It is an important mark for calibrating the boundary of the land parcel right. The four-to-four land parcel means the boundary lines between the four directions of a land parcel and the adjacent land, and generally fills out the names of the owners, the use units or the individuals of the four adjacent lands, and if the adjacent land is other markers such as roads, ditches and the like, fills out the corresponding names.
Most of the existing four-to-one searching modes of land parcel are manually distinguished, the four-to-one attributes are manually filled into the attribute table, the workload is large, and the efficiency is not high. The method of the normal external rectangular buffer and the azimuth angle search are adopted, but the calculation is relatively complex, and the accuracy rate of judging the adjacent land of some special shapes is not high. Therefore, how to overcome the defects of the prior art is a problem which needs to be solved in the technical field of basic geographic information data processing at present.
Disclosure of Invention
In view of the defects of the prior art, the invention provides a method for searching land parcel four-to-four based on boundary points and a 45-degree circumscribed rectangle, the method replaces manual judgment, the efficiency of searching land parcel four-to-four is greatly improved, the time and the labor cost are saved, the four-to-four search result has good accuracy, and the requirement of determining right of land is completely met.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for searching land parcel four-to-four by adopting boundary points and a 45-degree circumscribed rectangle is characterized by comprising the following steps:
step (1), constructing a 45-degree phase-separated external rectangle: constructing a 45-degree phase-separated external rectangle of the parcel to be searched; the two groups of opposite sides of the 45-degree phase-separated external rectangle are respectively at 45 degrees and 135 degrees with the X axis, and the parcel to be searched is located in the 45-degree phase-separated external rectangle;
step (2), searching a demarcation point: traversing all boundary address points of the parcel to be searched, calculating the distances from all the boundary address points to the four sides of the circumscribed rectangle with the phase angle of 45 degrees constructed in the step (1), and finding out the four boundary address points which are closest to the four sides of the circumscribed rectangle with the phase angle of 45 degrees on the parcel to be searched as boundary points;
step (3), generating a boundary: cutting the parcel boundary by the four demarcation points obtained in the step (3) to obtain four sections of boundary distinguishing lines, namely east, west, south and north boundary distinguishing lines;
and (4) searching for four: and (4) searching for other places adjacent to the parcel to be searched about the section boundary discriminant line for each section of boundary discriminant line obtained in the step (3), and storing the names of the adjacent other places into corresponding four-to-four attributes.
Further, it is preferable that the searching for four to four in step (4) is based on the adjacent topological relation of the adjacent parcel, and during the searching, a single line segment included in the boundary judgment line is used as a search unit, the adjacent parcel including the common edge of the search unit is searched, and the name information of the adjacent parcel is stored in the four to four attributes of the corresponding parcel to be searched.
Further, preferably, if the parcel to be searched is a triangle, when the boundary point is searched in step (2), when two edges that are 45 ° away from the circumscribed rectangle are the same boundary point, the boundary point has no boundary judgment line in the direction in which the boundary point is located, and then other three sections of boundary judgment lines are searched for other adjacent parcels, and the names of the other adjacent parcels are stored in the corresponding four-to attributes.
Further, preferably, if a boundary of a certain edge in the parcel to be searched is parallel to a boundary line of a 45 ° phase-to-external rectangle, and both the two boundary points of the boundary are the closest boundary points to the boundary line of the 45 ° phase-to-external rectangle, the first boundary point is selected as the boundary point according to the counterclockwise sequence of the parcel to be searched.
Further, it is preferable that all of the lands are located within 45 ° of the circumscribed rectangle.
Further, in the step (4), when the names of the neighbored parcels are stored in the corresponding four-to-attribute, only the parcel with the longest adjacent common boundary is preferably stored in each direction.
In the invention, the 45-degree separated external rectangle of the parcel to be searched is constructed in the step (1), and the 45-degree separated external rectangle can be adopted as a reference when each parcel is searched subsequently, so that the external rectangle does not need to be independently established for each parcel. When four sides of a 45-degree phase-separated circumscribed rectangle are constructed, a maximum value (the parameter value is set to be 100000000 in the embodiment of the invention) is adopted as a linear equation parameter, and all the places are ensured to be inside the rectangle. The four sides of the constructed rectangle are 45 degrees and 135 degrees from the X axis and are not intersected or tangent with the land parcel, so that the rectangle is called as a 45-degree apart circumscribed rectangle.
The boundary points in the step (2) are four boundary point points which are closest to four side lines of the circumscribed rectangle at a distance of 45 degrees on the land parcel to be searched, and are boundary points closest to four directions of southwest, southeast, northeast and northwest of the land parcel to be searched.
In the invention, the boundary in the step (3) is four boundary lines formed by cutting the boundary of the parcel by the boundary point; the land boundaries between the northeast and northwest, northwest and southwest, southwest and southeast, southeast and northeast, and southeast and northeast boundary are respectively used as a north boundary, a west boundary, a south boundary and an east boundary; recording boundary point coordinate sequences contained by each boundary, traversing the boundary points along the boundary of land parcel in the anticlockwise direction from the southwest boundary point, taking the boundary point set from the southwest boundary point to the southeast boundary point as a south boundary, and obtaining the boundary point coordinate sequences of four boundaries according to the rule; the boundary line is not a straight line in which the boundary points are directly connected, but a broken line segment in which the boundary points within the boundary line are connected along the parcel boundary.
If the parcel to be searched is a triangle, when the boundary point is searched in the step (2), the boundary point closest to two certain edges of the circumscribed rectangle with the angle of 45 degrees is the same boundary point, according to the anticlockwise direction, only the boundary point is taken as the boundary point corresponding to the first edge of the circumscribed rectangle with the angle of 45 degrees, and the other edge of the circumscribed rectangle is marked as a non-boundary point.
Compared with the prior art, the invention has the beneficial effects that:
(1) the global uniform 45-degree phase-separated external rectangle is adopted, only one time is needed to be constructed at the beginning, the global 45-degree phase-separated external rectangle is adopted as a reference when boundary points are searched for each parcel, and the external rectangle does not need to be separately established for each parcel.
(2) After boundary points in the four directions of southwest, southeast, northeast and northwest are found, boundary lines obtained by directly connecting simple boundary points or boundary line buffer rectangular frames are not used for carrying out intersection judgment with other places to search for four to four places, and the method is low in efficiency and can cause a large amount of fuzzy judgment. More reasonably, the boundary line adopted by the invention is a boundary point to cut the included parcel boundary, and collinear search is carried out based on the adjacent topological relation of the adjacent parcel, so that all four-to-all attributes of the parcel can be more reasonably and completely determined.
The method not only makes up the defects of the existing method at present, replaces manual judgment, greatly improves the efficiency of land parcel four-to-four searching, improves the efficiency by more than three times compared with other similar methods, but also greatly saves time and labor cost because the accuracy of the four-to-four searching result exceeds 99.9 percent, and completely meets the requirement of land right confirmation.
Drawings
FIG. 1 is a schematic flow chart of a method for performing parcel four-to-parcel search by using an address point and a 45-degree circumscribed rectangle according to an embodiment of the present invention;
FIG. 2 is an exemplary diagram of a four-to-one search of a parcel using the present invention.
Fig. 3 shows the searched demarcation point in the embodiment of the present invention.
FIG. 4 is a block diagram of the neighborhoods searched on the boundary in the embodiment of the present invention.
Fig. 5 shows the found four-to-one result in the embodiment of the present invention.
FIG. 6 is a diagram illustrating a first special case in an embodiment of the present invention.
FIG. 7 is a diagram illustrating a second special case according to an embodiment of the present invention.
Detailed Description
In order to facilitate the understanding and implementation of the present invention for those of ordinary skill in the art, the present invention is further described in detail with reference to the accompanying drawings and examples, it is to be understood that the embodiments described herein are merely illustrative and explanatory of the present invention and are not restrictive thereof. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The materials or equipment used are not indicated by manufacturers, and all are conventional products available by purchase.
A method for searching land parcel four-to-four by adopting an interface point and a 45-degree circumscribed rectangle comprises the following steps:
step (1): and constructing a globally uniform 45-degree phase-separated circumscribed rectangle (namely all the plots are located in the 45-degree phase-separated circumscribed rectangle), and when constructing four sides of the 45-degree phase-separated circumscribed rectangle, adopting a maximum value (the parameter value is set to be 100000000) as a linear equation parameter to ensure that all the plots are located in the rectangle. The four sides of the constructed rectangle are 45 degrees and 135 degrees from the X axis and are not intersected or tangent with each land parcel, so that the rectangle is called a 45 degrees apart circumscribed rectangle. The 45-degree separated circumscribed rectangle is adopted as a reference when each parcel is searched subsequently, and the circumscribed rectangle does not need to be established independently for each parcel.
The edge line equations in the northwest, northeast, southeast and southwest directions corresponding to the 45-degree phase-separated external rectangle are as follows:
step (2): selecting a parcel to be calculated, e.g. a parcel in Zhangya, point P in FIG. 21、P2、P3、P4、P5、P6、P7、P8、P9Boundary points of land parcel; all the boundary points of the parcel are traversed, the distances from all the boundary points to the four sides of the circumscribed rectangle with the 45-degree phase constructed in the step (1) are calculated, and the four boundary points which are closest to the four sides of the circumscribed rectangle with the 45-degree phase distance on the parcel to be searched are found and serve as boundary points;
in fig. 2, four solid lines in the northwest, northeast, southeast, and southwest directions represent four side lines circumscribing a rectangle. According to the equation of a straight line
And point-to-line distance formula
The distance formula from the boundary point to the four sides of the circumscribed rectangle at 45 degrees is as follows:
according to the formula, the boundary point P of the land in the northwest, northeast, southeast and southwest directions can be obtainedNW、PNE、PSE、PSW；
Step (3), generating a boundary: cutting the parcel boundary by the four demarcation points obtained in the step (3) to obtain four sections of boundary distinguishing lines, namely east, west, south and north boundary distinguishing lines;
the boundaries of the Zones between the northeast and northwest, northwest and southwest, southwest and southeast, southeast and northeast demarcation points are respectively used as the north, west, south and east demarcation lines. Recording the boundary point coordinate sequences contained by each boundary, traversing the boundary points along the land parcel boundary in the counterclockwise direction from the southwest boundary point, taking the boundary point set from the southwest boundary point to the southeast boundary point as the south boundary, and obtaining the boundary point coordinate sequences of four boundaries according to the rule, as shown in fig. 3.
And (4) searching for four: and (4) searching for other places adjacent to the parcel to be searched about the section boundary discriminant line for each section of boundary discriminant line obtained in the step (3), and storing the names of the adjacent other places into corresponding four-to-four attributes.
Specifically, the method comprises the following steps: for each boundary discriminant line, line segments formed by two adjacent coordinates contained in the boundary discriminant line are extracted one by one, and other places containing the line segment in the boundary are searched and recorded, as shown in fig. 4. And finally, storing the names of the adjacent parcels searched on the boundary distinguishing lines into four attributes of the current parcel respectively. Two ways can be selected according to needs, wherein the first way assigns all the adjacent places searched in each direction to the four-way attribute; the second is to assign only the parcel with the longest adjacent common boundary in each direction, as shown in fig. 5.
And (5): handling special cases: in the first case: as shown in FIG. 6, the land parcel is in the shape of a triangle, only three boundary points are provided, and in the boundary point search in the step (2), two boundary lines L which are separated from the circumscribed rectangle by 45 degrees are obtainedNWAnd LSWThe most recent are all the same boundary point P2As a special treatment, only the boundary point is used as one of the circumscribed rectangle sides LNWCorresponding demarcation point PNWSubsequently, only the neighborhoods of the north, east and south orientations are searched, and the neighborhoods of the west orientation are set to none. In the second case: as shown in FIG. 7, the middle boundary P of Zongdi "Zhangjie1P2Parallel to the side line L of the circumscribed rectangleNWBoundary points P at both ends of the boundary of the edge1And P2To the side line LNWIs equal, as a special treatment, only the first boundary point P of the boundary is taken in the counterclockwise direction1As a boundary point PNWAnd the subsequent steps are processed normally.
The process of automatically processing one parcel is described above, and the same processing as the steps (2) to (6) is performed on other parcels in the basic data, so that the process of automatically acquiring four attributes of the basic data is completed.
It should be understood that parts of the specification not set forth in detail are well within the prior art.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A method for searching land parcel four-to-four by adopting boundary points and a 45-degree circumscribed rectangle is characterized by comprising the following steps:
step (1), constructing a 45-degree phase-separated external rectangle: constructing a 45-degree phase-separated external rectangle of a parcel to be searched, and when constructing four sides of the 45-degree phase-separated external rectangle, adopting a maximum value as a linear equation parameter to ensure that all parcels are in the rectangle; the two groups of opposite sides of the 45-degree phase-separated external rectangle are respectively at 45 degrees and 135 degrees with the X axis, and the parcel to be searched is located in the 45-degree phase-separated external rectangle;
the edge line equations in the northwest, northeast, southeast and southwest directions corresponding to the 45-degree phase-separated external rectangle are as follows:
step (2), searching a demarcation point: traversing all boundary address points of the parcel to be searched, calculating the distances from all the boundary address points to the four sides of the circumscribed rectangle with the phase angle of 45 degrees constructed in the step (1), and finding out the four boundary address points which are closest to the four sides of the circumscribed rectangle with the phase angle of 45 degrees on the parcel to be searched as boundary points;
step (3), generating a boundary: cutting the parcel boundary by the four demarcation points obtained in the step (3) to obtain four sections of boundary distinguishing lines, namely east, west, south and north boundary distinguishing lines;
and (4) searching for four: for each section of boundary discriminant line obtained in the step (3), searching other neighborhoods adjacent to the section of boundary discriminant line to be searched, and storing the names of the other neighborhoods adjacent to the section of boundary discriminant line into corresponding four-to-four attributes;
and (4) the searching for the fourth to fourth ranges is based on the adjacent topological relation of the adjacent parcel, during the searching, a single line segment contained in the boundary judgment line is used as a searching unit, the adjacent parcel also containing the public edge of the searching unit is searched, and the name information of the adjacent parcel is stored in the four-range attribute of the corresponding parcel to be searched.
2. The method according to claim 1, wherein if the parcel to be searched is a triangle, when the boundary point is searched in step (2), when two edges of the bounding rectangle that are closest to each other by 45 ° are the same boundary point, the direction of the boundary point has no boundary discriminant line, and then the boundary discriminant lines of the other three segments are searched for other adjacent parcels, and the names of the other parcels are stored in the corresponding four-to-attribute.
3. The method according to claim 1, wherein if a boundary of a parcel to be searched is parallel to the boundary of the circumscribed rectangle with an angle of 45 °, and both boundary points of the boundary are the closest boundary points to the boundary of the circumscribed rectangle with an angle of 45 °, the first boundary point is selected as the boundary point in the counterclockwise sequence of the parcel to be searched.
4. The method of claim 1, wherein all parcel lands are located within a 45 ° bounding rectangle.
5. The method for parcel four-to-one search using an endpoint and a 45 ° bounding rectangle according to claim 1, wherein in step (4), when storing the names of its adjacent parcels into the corresponding four-to-one attributes, only the parcel with the longest adjacent common boundary is stored in each direction.
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| CN110489502B (en) * | 2019-07-26 | 2020-11-27 | 农业农村部规划设计研究院 | Method and device for acquiring boundary line position information |
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