KR101149348B1 - System and method for assessing accuracy of spatial information using gps surveying in realtime - Google Patents

Abstract

PURPOSE: A real-time spatial information position accuracy evaluation system in an independent GPS measurement mode and a method thereof are provided to reduce time and processes for determining spatial position information while reducing a GPS receiving device purchase cost. CONSTITUTION: A GPS receiver receives a GPS signal from a GPS satellite(S1). A reference point position setting unit sets a position of a reference point on spatial information(S2). A position calculator calculates an azimuth angle and a moving distance between inspection points of the spatial information and the reference point(S3). A GPS relative coordinate calculator calculates GPS relative coordinates with respect to the inspection point using the azimuth angle and the moving distance calculated from the position calculator(S4). A spatial information relative coordinate conversion part converts absolute coordinates with respect to the inspection point of the spatial information to spatial information relative coordinates(S5). A comparison calculation unit determines accuracy of the spatial information by comparing errors of the spatial information relative coordinate and the GPS relative coordinate with respect to the inspection point(S6).

Description

System and Method for Assessing Accuracy of Spatial Information Using GPS Surveying in Realtime}

The present invention relates to a system and method for evaluating spatial information location accuracy, and more particularly, to a system and method for evaluating the accuracy of spatial information such as digital maps, image maps, and GISs using a single GPS survey. will be.

Spatial information can be divided into geometric position data representing the geographical position, height, shape, and range of land, underground, ground and structures, and attribute data representing natural, social, economic, and characteristics. Therefore, the quality of the spatial information can be represented by the accuracy of the location information and the attribution information. As a method for confirming the location of the spatial information, a location accuracy evaluation method using GPS is most used.

GPS is a satellite navigation system that receives signals from satellites and calculates the user's current location.It is a high-accuracy and high-precision GPS that can calculate the location of the country's reference point and perceptual fluctuation up to mm units, and the user's location is about 10m ~ 50m. There are several types of GPS, such as

However, in order to secure the planar position accuracy within 1m or to evaluate the position accuracy using GPS as described above, an expensive GPS receiver is used or at least two GPSs are used to calculate the distance difference between GPS receiver positions. The DGPS or RTK-GPS method of calculating the position should be used.

However, when calculating the position using two or more GPS receivers, post processing is required using GPS-only processing software. Therefore, access to the general public without expertise is extremely limited.

On the other hand, GPS receivers used in navigation, smartphones or tablet PCs that are easily accessible and used around the present are relatively inexpensive and easy to use by the general public, but the accuracy of spatial location is more than 10m and 15m. There is an inadequate disadvantage in determining or confirming the precise location of spatial information.

Accordingly, the present inventors have made an effort to solve the above problem, and as a result, the GPS signal is used to calculate the 'GPS relative coordinates' for the check points, and the absolute coordinates for the check points on the spatial information indicated by the absolute coordinates are' After converting to 'spatial information relative coordinate' and comparing the error amount between 'GPS relative coordinate' and 'spatial information relative coordinate' for a checkpoint, the accuracy of spatial information can be evaluated in real time even with a low-cost GPS receiver. The facts were confirmed and the present invention was completed.

An object of the present invention is not to use expensive GPS or at least two or more GPS when evaluating the positional accuracy among spatial information quality such as high resolution orthogonal image using aerial photographs and satellite images as well as large scale digital map of 1 / 5,000 or more. The present invention provides a spatial information position accuracy evaluation system capable of confirming accurate position information without using the same and a real time evaluation method using the same.

In order to achieve the above object, the present invention (a) GPS receiver for receiving a GPS signal from a GPS satellite; (b) a reference point position designation unit for designating a position of the reference point on the spatial information and checking a GPS reception state; (c) a position calculator for calculating a moving distance and azimuth between the reference point and the inspection point by using the received GPS signal; (d) a GPS relative coordinate calculation unit that calculates a GPS relative coordinate (X, Y) for a test point by using the moving distance and azimuth angle calculated by the position calculator; (e) a spatial information relative coordinate converter for converting the absolute coordinates of the inspection points on the spatial information represented by the absolute coordinates into spatial information relative coordinates (X ', Y'); And (f) a comparison calculator that compares the error amounts of the GPS relative coordinates (X, Y) and the spatial information relative coordinates (X ′, Y ′) with respect to the inspection point to determine the accuracy of the spatial information. Provides a real-time spatial information position accuracy evaluation system using surveying.

The present invention also includes the steps of (a) receiving a GPS signal from a GPS satellite at the GPS receiver; (b) designating a position of the reference point on the spatial information in the reference point position designating unit; (c) calculating a moving distance and azimuth between the reference point and the inspection point by using the received GPS signal in a position calculator; (d) calculating GPS relative coordinates (X, Y) with respect to an inspection point by using the calculated moving distance and azimuth in the GPS relative coordinate calculation unit; (e) converting the absolute coordinates of the inspection points on the spatial information represented by the absolute coordinates in the spatial information relative coordinate conversion unit into the spatial information relative coordinates (X ′, Y ′); And (f) comparing the error amount between the GPS relative coordinates (X, Y) and the spatial information relative coordinates (X ′, Y ′) with respect to the checkpoint in the comparison calculator to determine the accuracy of the spatial information. It provides a real-time spatial information position accuracy evaluation method using the real-time spatial information position accuracy evaluation system.

According to the present invention, at least two expensive GPS receivers can be used to secure spatial position accuracy. As a result, the purchase price of GPS receivers can be reduced economically.

In addition, the conventional method can reduce the process and time required for the inspector to confirm the spatial position information by going through subsequent processing to confirm the result value, and only the expert who can handle the GPS processing software can use it. Accurate spatial information location information can be easily accessed even by non-professionals, so the location accuracy of the spatial information can be improved and widely used in the location-based industry. In addition to time and cost savings, it is possible to secure objectivity of the quality of spatial information.

1 is a flowchart of a method for evaluating real-time spatial information position accuracy using a system for evaluating real-time spatial information position accuracy according to an embodiment of the present invention.
2 is an exemplary diagram for setting a position of a point to be used as a reference point in spatial information as a fixed point for comparing position accuracy according to an embodiment of the present invention.
3 is an explanatory diagram showing a method of obtaining coordinate values (X, Y) at a certain point when knowing a straight line distance between two points at a point (0,0) and an angle value of the straight line according to an embodiment of the present invention. to be.
4 is a diagram for designating a position to be inspected on spatial information according to an embodiment of the present invention, and comparing GPS relative coordinates calculated by using azimuth and distance information of GPS and spatial information relative coordinates calculated by spatial information. It is explanatory drawing which showed that a vehicle is calculated and a test | inspection is carried out and confirmed whether it is determination.
FIG. 5 is an exemplary diagram illustrating an error amount of position points detected based on an inspection reference point as a vector, and showing standard deviation, maximum error, and minimum error of the inspection points according to an embodiment of the present invention.

Specific features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

The present invention in one aspect, (a) a GPS receiver for receiving a GPS signal from a GPS satellite; (b) a reference point position designation unit for designating a position of the reference point on the spatial information and checking a GPS reception state; (c) a position calculator for calculating a moving distance and azimuth between the reference point and the inspection point by using the received GPS signal; (d) a GPS relative coordinate calculation unit that calculates a GPS relative coordinate (X, Y) for a test point by using the moving distance and azimuth angle calculated by the position calculator; (e) a spatial information relative coordinate converter for converting the absolute coordinates of the inspection points on the spatial information represented by the absolute coordinates into spatial information relative coordinates (X ', Y'); And (f) a comparison calculator that compares the error amounts of the GPS relative coordinates (X, Y) and the spatial information relative coordinates (X ′, Y ′) with respect to the inspection point to determine the accuracy of the spatial information. A real-time spatial information position accuracy evaluation system using surveying.

The GPS receiver is for receiving a GPS signal from a GPS satellite, and in the present invention, a GPS installed in a mobile phone, a smartphone, a tablet PC, etc. may be used as it is, or a low-cost GPS receiver may be used without purchasing a separate GPS receiver. .

The reference point position designator designates the position of the reference point on the spatial information and checks the GPS reception state.

The position calculating unit calculates a moving distance and an azimuth angle between the reference point and the inspection point by using the received GPS signal.

The GPS relative coordinate calculator calculates the GPS relative coordinates (X, Y) for the inspection point by using the moving distance and the azimuth angle calculated by the position calculator.

The spatial information relative coordinate converting unit converts the absolute coordinates of the inspection points on the spatial information represented by the absolute coordinates into the spatial information relative coordinates (X ′, Y ′).

The comparison calculator compares the error amounts of the GPS relative coordinates (X, Y) and the spatial information relative coordinates (X ', Y') with respect to the checkpoint to determine the accuracy of the spatial information.

And, in another aspect, (a) receiving a GPS signal from a GPS satellite in the GPS receiver; (b) designating a position of the reference point on the spatial information in the reference point position designating unit; (c) calculating a moving distance and azimuth between the reference point and the inspection point by using the received GPS signal in a position calculator; (d) calculating GPS relative coordinates (X, Y) with respect to an inspection point by using the calculated moving distance and azimuth in the GPS relative coordinate calculation unit; (e) converting the absolute coordinates of the inspection points on the spatial information represented by the absolute coordinates in the spatial information relative coordinate conversion unit into the spatial information relative coordinates (X ′, Y ′); And (f) comparing the error amount between the GPS relative coordinates (X, Y) and the spatial information relative coordinates (X ′, Y ′) with respect to the checkpoint in the comparison calculator to determine the accuracy of the spatial information. It relates to a real-time spatial information position accuracy evaluation method using the real-time spatial information position accuracy evaluation system.

1 is a flowchart of a method for evaluating real-time spatial information position accuracy using a system for evaluating real-time spatial information position accuracy according to an embodiment of the present invention.

First, the GPS receiver receives a GPS signal from a GPS satellite (S1).

When receiving the GPS signal, the reference point position designator designates the position of the reference point on the spatial information (S2).

The reference point position designator performs a function of designating a reference point capable of performing a relative comparison between spatial information positions.

2 is an exemplary diagram for setting a position of a point to be used as a reference point in spatial information as a fixed point for comparing position accuracy according to an embodiment of the present invention.

As shown in FIG. 2, when spatial information, such as a numerical map, an image map, a GIS, to be examined, is loaded into the spatial information opening function 202, it is displayed 206 on the full screen. In this case, the schematic position of the enlarged spatial information is also displayed on the screen (205). When the arbitrary position coordinates desired by the user are fixed to the reference point coordinates on the full screen, the reference point coordinates are fixed by using the position designation function 203.

At this time, the reference point coordinates 207 are displayed in the map coordinate system coordinates input to the spatial information. The user designated coordinates 208 can use the reference point coordinates 207 as fixed coordinates, but in order for the operator to easily recognize the coordinate values of the current reference point coordinates, the user can select arbitrary X, Y values as (0, 0) or ( 10, 10), etc., to indicate a function that can be used.

Since the accuracy of the position serving as the reference point may be somewhat different depending on the GPS satellite state, a number representing an error in positioning according to the number of satellites received by the GPS receiver and the placement of the Position Dilution of Precision. Less means that the error amount is small) and automatically calculates whether it is usable as a reference point (204). Although there may be some differences depending on the location, the number of satellites received is preferably at least four, and the PDOP value is preferably 3.0 or less.

Next, the position calculating unit calculates the moving distance and the azimuth angle between the reference point and the inspection point to be inspected by the operator using the received GPS signal (S3).

The GPS receiver may separately extract the position coordinates and azimuth of the received GPS from the received signal, and using the extracted values, the position calculator calculates an azimuth angle P between the reference point and the inspection point according to Equation 1 below. , And calculates the moving distance (D) between the reference point and the inspection point by the equation (2).

상기 수학식 1에서, 상기 기준점과 검사점을 연결한 직선과 좌표평면의 Y(동쪽)축이 이루는 각은 90°이하임

In Equation 1, the angle formed by the straight line connecting the reference point and the inspection point and the Y (east) axis of the coordinate plane is 90 ° or less.

Next, the GPS relative coordinate calculation unit calculates the GPS relative coordinates (X, Y) for the inspection point by using the calculated moving distance and azimuth (S4).

 GPS relative coordinate calculation unit calculates the GPS relative coordinates (X, Y) by the following equation (3).

상기 수학식 3에서, D는 기준점과 검사점간의 이동거리이며, 상기 기준점과 검사점간의 방위각(P)는 상기 수학식 1에 의하여 산출됨.

In Equation 3, D is a moving distance between the reference point and the inspection point, and the azimuth angle P between the reference point and the inspection point is calculated by Equation 1.

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3 is an explanatory diagram illustrating a method of obtaining coordinate values (X, Y) at a certain point when the linear distance between two points at a point (0,0) and the angle value of the straight line are known according to an embodiment of the present invention. When described in more detail with reference to as follows.

First, if the reference point is designated as A (0,0) and the distance and orientation of the point B to be obtained are known, the GPS relative coordinates (X, Y) can be calculated through the equation.

For example, if the coordinate of the reference point A is (0,0), the travel distance to the check point B is 116.3102, and the azimuth is 29.2922 °, the radian value of the check point B is 3.141592. (PI) /180×29.2922 = 0.511245 (Radian), and by substituting this in Equation 3, X = 116.3102 × cos (0.511245) and Y = 116.3102 × sin (0.511245) are calculated (101.43830, 56.90636) The relative coordinates of (X, Y) can be obtained.

Next, the spatial information relative coordinate conversion unit converts the absolute coordinates of the inspection points on the spatial information represented by the absolute coordinates into the spatial information relative coordinates (X ', Y') (S5).

Spatial data such as digital maps, image maps, and GIS (geographical information systems) use the absolute coordinate system according to the national standard coordinate system. In the present invention, since the relative coordinates calculated by the GPS relative coordinate calculator are to be compared, the absolute coordinates of the spatial information must also be converted to the relative coordinates. In the conversion from the absolute coordinates to the relative coordinates, the difference between the reference point coordinates (X, Y) and the checkpoint coordinates (X, Y) in the spatial information can be easily calculated using Equation 2.

4 is a diagram for designating a position to be inspected on spatial information according to an embodiment of the present invention, and comparing GPS relative coordinates calculated by using azimuth and distance information of GPS and spatial information relative coordinates calculated by spatial information. It is explanatory drawing which showed that a vehicle is calculated and a test | inspection is carried out and confirmed whether it is determination.

As shown in FIG. 4, the position check coordinate designation 401 is arranged like the entire image display unit 405 so as to display a rough position of the inspection point and does not use the function of the spatial information opening 402. Spatial information such as digital map, orthoimage, GIS, etc., where the inspection point to be inspected can be loaded.The user can easily find the spatial information and the site as shown in (406). To select a point to use, and to specify the point to use it, the function of positioning (403) can be used. In the location check coordinate designation 401, the GPS reception status may be checked using the GPS satellite status 407 function of the location to be checked to determine whether the GPS signal is used at the current location.

The moving distance and azimuth between the reference point and the inspection point calculated by the position calculator are displayed on the screen (406), and the GPS relative coordinates (X, Y) for the inspection point calculated by the GPS relative coordinate calculation unit are also displayed on the screen (408). The spatial information relative coordinates X 'and Y' calculated by the spatial information relative coordinate converter are also displayed 409 on the screen.

Finally, the comparison calculation unit compares the error amounts of the GPS relative coordinates (X, Y) and the spatial information relative coordinates (X ', Y') with respect to the inspection point to determine the accuracy of the spatial information (S6).

The comparison calculator calculates an error amount 410 of the GPS relative coordinates (X, Y) and the spatial information relative coordinates (X ′, Y ′) with respect to the inspection point by Equation 4 below.

The result of the determination of accuracy using the calculated error amount is displayed as OK if satisfied within the range specified by the inspector, and if not satisfied (411).

FIG. 5 is an exemplary diagram illustrating an error amount of position points detected based on an inspection reference point as a vector, and showing standard deviation, maximum error, and minimum error of the inspection points according to an embodiment of the present invention.

As shown in FIG. 5, the accuracy determined by the comparison calculator is displayed on the same screen as the inspection result 501. The standard deviation, maximum and minimum error values for the inspection results are displayed on the screen, allowing the inspector to make a real-time determination of spatial information position accuracy in the field, and the final result is stored using a result storage (503). Can be stored. In addition, by displaying the error for the inspection points around the reference point 506 as a vector amount on the real-time display window 504, it is easy to check the error distribution in the spatial information to be evaluated by the user.

The inspection reference point 506 indicates the position of the point set by the user as the inspection criterion in the spatial information. The direction and size of each arrow in the real-time display window indicate the error direction and the amount of error for each of the measured inspection points. Indicates that is displayed. That is, when the standard arrow size 505 as a reference indicates an error amount 1.0, when the arrow on the real-time display window 504 is smaller than the arrow of the arrow standard size 505, a point where the error amount is smaller than 1.0 appears. If it is larger than the arrow, the error amount is more than 1.0, and it has a function to intuitively identify the point where the error is large. The standard difference and the maximum and minimum error values for each point are calculated and displayed (502), and for the completed results, the result is stored using the function of storing the result (503).

As described above in detail specific parts of the present invention, it will be apparent to those skilled in the art that these specific descriptions are merely preferred embodiments, and thus the scope of the present invention is not limited thereto. will be. Accordingly, the actual scope of the present invention will be defined by the appended claims and their equivalents.

Claims (6)

(a) a GPS receiver for receiving a GPS signal from a GPS satellite;
(b) a reference point position designation unit for designating a position of the reference point on the spatial information and checking a GPS reception state;
(c) a position calculator for calculating a moving distance and azimuth between the reference point and the inspection point by using the received GPS signal;
(d) a GPS relative coordinate calculation unit that calculates a GPS relative coordinate (X, Y) for a test point by using the moving distance and azimuth angle calculated by the position calculator;
(e) a spatial information relative coordinate converter for converting the absolute coordinates of the inspection points on the spatial information represented by the absolute coordinates into spatial information relative coordinates (X ', Y'); And
(f) An independent GPS surveying unit comprising a comparison calculation unit for comparing the error amounts of the GPS relative coordinates (X, Y) and the spatial information relative coordinates (X ′, Y ′) with respect to the inspection point to determine the accuracy of the spatial information. Real-time spatial information location accuracy evaluation system using
The method of claim 1, wherein the position calculating unit calculates the azimuth angle (P) between the reference point and the inspection point by the following equation 1, and calculates the moving distance (D) between the reference point and the inspection point by the equation (2) System:
[Equation 1]

In Equation 1, the angle formed by the straight line connecting the reference point and the inspection point and the Y (east) axis of the coordinate plane is 90 ° or less.

[Equation 2]

The system of claim 1, wherein the GPS relative coordinate calculator calculates the GPS relative coordinates (X, Y) according to Equation 3 below:
[Equation 3]

In Equation 3, D is a moving distance between the reference point and the inspection point, and the azimuth angle P between the reference point and the inspection point is calculated by Equation 1.
The method of claim 1, wherein the spatial information relative coordinate converter calculates the spatial information relative coordinates using a difference value between the reference point coordinates of the spatial information in the spatial information displayed in absolute coordinates and the coordinates of the inspection point using GPS. System.
The method of claim 1, wherein the comparison calculator calculates an error amount between the GPS relative coordinates (X, Y) and the spatial information relative coordinates (X ′, Y ′) with respect to the inspection point by Equation 4 below. system:
&Quot; (4) "

(a) receiving a GPS signal from a GPS satellite at a GPS receiver;
(b) designating a position of the reference point on the spatial information in the reference point position designating unit;
(c) calculating a moving distance and an azimuth angle between a reference point and an inspection point by a position calculator by using the GPS signal input from the GPS receiver;
(d) calculating GPS relative coordinates (X, Y) with respect to an inspection point by using the calculated moving distance and azimuth in the GPS relative coordinate calculation unit;
(e) converting the absolute coordinates of the inspection points on the spatial information represented by the absolute coordinates in the spatial information relative coordinate conversion unit into the spatial information relative coordinates (X ′, Y ′); And
(f) comparing the error of the GPS relative coordinates (X, Y) and the spatial information relative coordinates (X ′, Y ′) with respect to the checkpoint in the comparison calculator to determine the accuracy of the spatial information. The real-time spatial information position accuracy evaluation method using a real-time spatial information position accuracy evaluation system according to any one of claims 1 to 5.

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