JP2008032693A - Target location guiding method and system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a target location guiding method and system for displaying a location relationship between a current location measured by a location sensor and a target location as a goal on a portable terminal, and guiding a user to the target location by using a method for easily inputting the target location. <P>SOLUTION: A portable terminal uses an image scanner, reads a map, and captures the map as a digital map. The location sensor in a satellite positioning system measures two reference latitude/longitude coordinate values written on the map and confirmed in the field. Two reference latitude/longitude coordinate values are converted into coordinate values in a Cartesian coordinate system. A value in the Cartesian coordinate system corresponding to each dot on the digital map is calculated. The portable terminal receives information from the location sensor in the satellite positioning system and a correction signal from a radio device, and displays the digital map so as to match the current location output from the location sensor with a pointer of the current location on the digital map. The portable terminal simultaneously displays a marker of the current location moved along with a walking worker and the target location on the digital map. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a target position guidance method that allows easy input of a target position in a system that guides a destination by displaying a target position on a map and a current position specified by a position sensor on a screen of a mobile terminal.

  In general, the back position surveying in construction work can be cited as an application of the target position guidance. Back-counting surveying refers to surveying work in which design coordinate values such as positions of foundation piles of a predetermined structure are installed in a construction site. In the target position guidance system, a design coordinate value is input as a target position, and guidance from the current position to the target position is required. The guidance method to the target position in the construction work is performed by displaying the positional relationship between the target position and the current position on the screen of the mobile terminal and showing the distance and direction from the current position to the target position to the operator. The operator moves in the direction of the target position while looking at the screen so that the display of the current position and the target position coincide on the screen.

  The target position of the construction work is the position of the foundation pile of the structure, and the coordinate value is determined at the stage of designing the structure. Therefore, for guidance to the target position, the coordinate value of the target position is first input to the mobile terminal, then the current position is measured by a position sensor such as a satellite positioning system, and the positional relationship between the target position and the current position is determined by the mobile terminal. This is done by displaying on the screen.

As described in Patent Document 1, an invention of an object position guidance system that can easily reach a target target tree using map data even when there is no data to navigate is also disclosed.
JP 2005-49327 A

  However, guidance to the target position in construction work is based on the premise that the coordinate value of the target position is determined in advance, and the coordinate value is unknown, for example, written directly on a map printed on paper. Guidance to the desired destination is not considered. In surveying the survey position in the environmental survey, guidance to the target position is often required based on the target position that is the survey position written directly on the map. This is due to the fact that the survey location is determined based on the topographical information on the map printed on paper and past land use information.

  When using the destination guidance system used for backlash surveying of construction work for surveying the survey location in such environmental surveys, the target location cannot be displayed and guidance cannot be provided unless the coordinate value of the target location is entered. Therefore, it is necessary for a human to read the coordinate value of the target position directly written with a mark on a map printed on paper in advance, and input the read coordinate value to the portable terminal. When the target position is several tens to hundred points, it takes a lot of time for preparation, and there is a risk of human error in reading coordinate values. There has been a demand for a method of easily inputting data to a portable terminal.

  In view of the above-described problems, the present invention provides a target position guide that can easily guide a target position without a human reading the coordinate value of the target position directly written on the map and inputting the numerical value into the portable terminal. It aims to provide a method.

  The target position is written with a mark on a map printed on paper, read by an image scanner, and imported to a portable terminal as a digital map. The latitude and longitude coordinate values of two reference points that are described on the map and can be confirmed on site are measured by a position sensor such as a satellite positioning system.

  A conversion formula that can calculate the coordinate value of the digital map from the latitude and longitude coordinate value of the position sensor so that the latitude and longitude coordinate value corresponding to each dot of the digital map can be calculated using the latitude and longitude coordinate values of the two reference points. Generate. Using this conversion formula, the digital map is displayed so that the current position output from the position sensor matches the display of the current position on the digital map. Thereby, the current position is displayed on the digital map on the portable terminal.

  The operator can confirm the direction and distance of the target position by checking the positional relationship between the current position and the target position written on the digital map on the screen of the portable terminal. Therefore, the operator can be guided to the target position.

  The present invention includes a step of directly writing a target position with a pen on a map printed on paper, a step of scanning a map on which the target position has been written with an image scanner and importing the map into a portable terminal, and defining a screen coordinate system for the imported map image The step of acquiring two or more reference point display coordinate values in the screen coordinate system, the step of measuring the field reference point latitude / longitude coordinate value in the field by the position sensor, and converting the coordinate value in the orthogonal coordinate system by the position sensor A step of calculating the display coordinate value of the current position for displaying the measured current position on the screen of the mobile terminal, displaying a pointer + mark on the display coordinate value of the current position, and carrying the positional relationship between the current position and the target position It was set as the structure of the process displayed on a terminal.

  The present invention can easily guide the user to the target position without reading the coordinate value of the target position directly written on the map and inputting the numerical value into the portable terminal.

  The present invention aims to easily guide the user to the target position without reading the coordinate value of the target position directly written on the map and inputting the numerical value into the portable terminal. The process of writing the target position by using the image scanner, scanning the map with the target position written with an image scanner and importing it to the mobile terminal, defining the screen coordinate system for the captured map image, and displaying two or more reference points in the screen coordinate system In order to display the current position measured by the position sensor, the step of acquiring the coordinate value, the step of measuring the local reference point latitude / longitude coordinate value at the site by the position sensor and converting it to the coordinate value in the orthogonal coordinate system, on the screen of the portable terminal The step of calculating the display coordinate value of the current position, the pointer + mark is displayed on the display coordinate value of the current position, and the positional relationship between the current position and the target position is displayed on the portable terminal It was achieved by that process.

  Below, based on an accompanying drawing, the target position guidance method and system which are the present invention are explained in detail. FIG. 1 is a diagram showing a map printed on paper, a target position, a ruler for entering a reference point, and a pen.

  On the map 18 printed on paper, the target position 19 is directly written with an X mark with the pen 18a. For example, in the setting of the survey point that becomes the target position 19 in the environmental survey, the survey area is divided by the 10 m mesh 19b, and the survey point is determined for each mesh 19b. The ruler 18b is necessary to draw the mesh 19b, but the mesh 19b is not necessary for guiding to the target position 19. The target position 19 is written with a cross using the pen 18a.

  Further, two reference points 19a that can be confirmed on both the map 18 and the work site 21 are determined, and are directly written on the map 18 with a circle mark by the pen 18a. Here, the reference point 19a refers to a survey reference point managed by a central point of an intersection, an end point of a road, a country, a local government, or the like. Any symbol may be used for the X mark and the ○ mark.

  FIG. 2 is a diagram showing a target position and a reference point written on a map printed on paper.

  FIG. 3 is a diagram illustrating an image scanner and a portable terminal that scan a map printed on paper.

  The map 18 printed on the paper on which the target position 19 and the reference point 19a are written is scanned at regular intervals by the image scanner 2, and gradation data corresponding to the density is output to the portable terminal 1. The portable terminal 1 creates an image file from the gradation data. This image file is a digital map 20. The digital map 20 also includes a cross mark of the target position 19 and a circle mark of the reference point 19a.

  FIG. 4 is a diagram showing a display coordinate system of a digital map.

  The digital map 20 has a display coordinate system having, for example, an x axis with the upper left as the origin (0, 0), a horizontal direction that is positive from left to right, and a vertical direction that has a y axis that is positive from top to bottom. Define Note that the origin location of the display coordinate system and the method of taking the axis may be anything.

  FIG. 5 is a diagram illustrating reading of the display coordinate value of the reference point.

  The display coordinate values in the display coordinate system of the two reference points 19a are examined. The display coordinate values (x1, y1) and (x2, y2) of the two reference points marked with ○ are read.

  6 and 7 are diagrams illustrating measurement of latitude and longitude coordinate values by the position sensor of the first reference point 19a.

  The latitude / longitude coordinate value of the first reference point 19a is measured. Either of the two reference points 19a may be used.

  FIG. 6 shows a case where the differential calculation method with a positioning accuracy of about 1 to 3 m or the kinematic method with a positioning accuracy of about several centimeters to several tens of centimeters is used as the positioning calculation method of the position sensor of the satellite positioning system. It is explanatory drawing when installing the reference station which calculates the correction information required in order to improve by itself.

  Since the positioning accuracy of the positioning sensor is the guide position accuracy of the target position 19, the positioning calculation method is selected according to the required guide accuracy.

  In order to calculate correction information necessary for the differential method and the kinematic method, a receiving station 4 is fixed at a fixed location, the correction information is calculated by the receiver 5, and the reference station that transmits the correction information by the radio device 6 is required. It becomes. In this case, for example, the receiving antenna 4 is fixed to the first reference point 19a using the leveling table 10 and the tripod 11, and the correction information is calculated by the receiver 5. The calculation of the correction information requires the latitude and longitude coordinate values of the first reference point 19a, and the accuracy is required to be about 10 m. Therefore, the radio wave from the satellite is received by the receiving antenna 4, and the single positioning method is used. By causing the receiver 5 to perform positioning calculation, the latitude / longitude coordinate value of the first reference point 19a is determined with an accuracy of about 10 m, and is set in the receiver 5 as the latitude / longitude coordinate value of the reference point 19a. With this setting, the correction information can be calculated in the receiver 5. The calculated correction information is sequentially transmitted via the wireless device 6. The latitude / longitude coordinate values set in the receiver 5 of the reference station are recorded in the portable terminal 7 as the measurement result of the first reference point 19a.

  FIG. 7 shows a correction information data distribution service when a single positioning method with a positioning accuracy of about 10 m is used as a positioning calculation method of a position sensor of a satellite positioning system, or when a differential method or a kinematic method is used. It becomes explanatory drawing when receiving.

  When the single positioning method is used, the wireless device 6 that receives the correction information is not necessary. The first reference point is obtained by holding the pole 8 having the receiving antenna 4 at the tip vertically on the reference point 19a, receiving the radio wave from the satellite by the receiving antenna 4, and performing the single positioning calculation by the receiver 5. The latitude / longitude coordinate value of 19a can be measured. The measurement result is output to the mobile terminal 7 and recorded in the mobile terminal 7.

  When using the differential method or the kinematic method and receiving correction information from the data distribution service, the wireless device 6 sequentially receives the correction information via the communication line provided by the service, and the receiver 5 Output to. At the same time, the pole 8 with the receiving antenna 4 attached to the tip is vertically held on the reference point 19a, the radio wave from the satellite is received by the receiving antenna 4, and the receiver 5 performs the positioning calculation of the differential method or the kinematic method. By doing so, the latitude / longitude coordinate value of the first reference point 19a can be measured. The measurement result is output to the mobile terminal 7 and recorded in the mobile terminal 7. If the latitude / longitude coordinate value of the reference point 19a is known in advance, the value may be used without being measured.

  FIG. 8 is a diagram illustrating measurement of latitude and longitude coordinate values by the position sensor of the second reference point.

  The latitude / longitude coordinate value of the second reference point 19a is measured. Move to the second reference point 19a, hold the pole 8 with the receiving antenna 4 at the tip vertically on the reference point 19a, receive the radio wave from the satellite with the receiving antenna 4, and calculate the positioning with the receiver 5 do.

  When the selected positioning method is the single positioning method, the wireless device 6 that receives the correction signal is not necessary. When the reference station is installed at the first reference point 19a, the correction information transmitted from the reference station radio 6 is sequentially received by the radio 6 and output to the receiver 5. When receiving correction information from the data distribution service, the wireless device 6 sequentially receives correction signals via a communication line provided by the service and outputs the correction signals to the receiver 5. As in the case of determining the latitude / longitude coordinate value of the first reference point 19a, a static method or a previously known latitude / longitude coordinate value may be used.

  In the receiver 5, the positioning calculation of the selected positioning method is performed, and the latitude / longitude coordinate value of the second reference point 19 a is output to the portable terminal 7. In the portable terminal 7, the latitude / longitude coordinate value is recorded.

  FIG. 9 is a diagram illustrating coordinate system conversion.

  The measurement result of the position sensor of the satellite positioning system is output as latitude and longitude coordinate values in the world coordinate system. In contrast, a map is a projection of the topography of the earth's sphere onto a plane. In addition, the unit of distance that the operator 22 can easily handle at the site 21 is meters. Therefore, the latitude and longitude coordinate values in the world coordinate system are converted into an orthogonal coordinate system such as a UTM coordinate system or a planar rectangular coordinate system and handled. The coordinate system conversion method from the world coordinate system to the UTM coordinate system or the plane rectangular coordinate system may be any conversion to a coordinate system projected onto a plane, and will follow a generally defined method.

  FIG. 10 is a diagram illustrating the correspondence between the on-site reference point orthogonal coordinate values and display coordinate values of two reference points.

  The correspondence between the display coordinate values (x1, y2), (x2, y2) of the display coordinate system of the two reference points 19a and the orthogonal coordinate values (Ref_UTMx1, Ref_UTMy1), (Ref_UTMx2, Ref_UTMy2) of the UTM coordinate system in the display coordinate system Show. In FIG. 10, the values in the parentheses are orthogonal coordinate values. Conversion that converts the orthogonal coordinate system obtained by the coordinate system conversion from the latitude and longitude coordinate values of the world coordinate system obtained by the position sensor from the relationship between the display coordinate value and the orthogonal coordinate value of the two reference points 19a to the display coordinate system Guide the formula.

  FIG. 11 is a diagram illustrating a conversion formula for display coordinate values.

  Conversion formula for converting an orthogonal coordinate system obtained by coordinate system conversion from a latitude / longitude coordinate value of a world coordinate system obtained by a position sensor from a relationship between a display coordinate value and an orthogonal coordinate value at two reference points 19a to a display coordinate system Lead.

  The on-site reference point orthogonal coordinate value is a coordinate value obtained by converting a latitude / longitude coordinate value obtained by measuring the reference point 19a with a position sensor into an orthogonal coordinate value (see FIG. 9).

  The display coordinate value of the reference point 19a is the coordinate value of the reference point 19a in the display coordinate system (see FIG. 5).

  The orthogonal coordinate value of the position sensor is a coordinate value obtained by converting a latitude / longitude coordinate value measured by the position sensor (for example, a latitude / longitude coordinate value obtained by measuring the current position by the position sensor) into an orthogonal coordinate system by the coordinate system conversion of FIG. .

  The orthogonal coordinate value of the position sensor is a display coordinate value corresponding to the orthogonal coordinate value of the position sensor.

  In order to display the current position with a + mark on the map displayed on the mobile terminal 7, it is necessary to derive the display coordinate value from the latitude / longitude coordinate value measured by the position sensor. Therefore, after the coordinate system conversion in FIG. 9, the conversion formula of FIG. 11 is used to convert the coordinate values to the display coordinate system.

  The coordinate value of the corresponding display coordinate system can be calculated from the latitude and longitude coordinate values measured by the position sensor of the satellite positioning system by coordinate system conversion (see FIG. 9) and conversion formula (see FIG. 11). It is possible to display with a symbol such as a mark.

  FIG. 12 is a device configuration diagram of the target position guidance system.

  The target position guidance system includes a portable terminal 1, an image scanner 2, a satellite 3 of a satellite positioning system, a receiving antenna 4 of a satellite positioning system, a receiver 5 of a satellite positioning system, a wireless device 6 for communicating correction information, a portable terminal 7, It comprises a pole 8, an antenna 9 for a satellite positioning system, a leveling table 10, a tripod 11, a receiver 12 for a satellite positioning system, a radio 13 for communicating correction signals, and the like.

  The portable terminal 1 is possible even if it is not portable. The portable terminal 1 and the image scanner 2 are used for digitizing a map and displaying it on the portable terminal 1.

  The receiving antenna 4 of the satellite positioning system, the receiver 5 of the satellite positioning system, the wireless device 6 that communicates correction information, the portable terminal 7, and the pole 8 are carried by the operator 22 when using the target position guidance system. .

  The antenna 9 of the satellite positioning system, the leveling base 10, the tripod 11, the receiver 12 of the satellite positioning system, and the wireless device 13 for communicating the correction signal are devices for installing the reference station 17 of the satellite positioning system by itself. Note that this is not necessary when the correction signal distribution service is used as shown in FIG.

  A portable terminal 1 and an image scanner 2 are used to digitize a map printed on paper. The portable terminal 1 may be the same as the portable terminal 7 or may be another personal computer.

  A radio wave transmitted from the satellite 3 of the satellite positioning system is received by the receiving antenna 4, and the positioning of the antenna position is calculated by the receiver 5.

  The single positioning method using only one set of the receiving antenna 4 and the receiver 5 has a positioning accuracy as low as about 10 m. Therefore, the differential method and the positioning accuracy with a positioning accuracy of about 1 to 3 m depending on the required guidance accuracy of the target position. A kinematic method of about several centimeters to several tens of centimeters is used. In order to use the differential method or the kinematic method, a “reference station” that receives radio waves from the satellite 3 by the receiving antenna 9 and calculates correction information by the receiver 12 is separately required. The receiving antenna 9 of the reference station needs to be fixed at one place in order to calculate correction information. For example, a leveling table 10 that keeps the receiving antenna 9 horizontal and fixed, and a tripod 11 that is fixed to the ground are required. . The correction information calculated by the receiver 12 is transmitted to the wireless device 6 via the wireless device 13. Note that these base station devices are not required when using a service for distributing correction information.

  Use a positioning method according to the accuracy required to guide the target position. Correction information is required except for the single positioning method. The correction information is received from the wireless device 6, and the receiver 5 calculates the position of the receiving antenna 4 by the differential method or the kinematic method. As described above, the correction information may be transmitted from its own reference station, or a service that distributes correction signals may be used. Further, if the guidance accuracy is about 10 m, positioning calculation may be performed by a single positioning method that does not use correction information.

  The result of calculating the position of the receiving antenna 4 by the receiver 5 is received by the portable terminal 7 (notebook personal computer) and used for displaying the current position. The operator 22 has a pole 8 with the receiving antenna 4 attached to the tip, and moves toward the target position from the positional relationship between the current position and the target position displayed on the screen of the mobile terminal 7.

  FIG. 13 is a screen of the portable terminal of the target position guidance system.

  Reference numeral 14 is a display of a + mark indicating the current position, reference numeral 15 is a coordinate value of the current position, and reference numeral 16 is a display of an x mark indicating the target position.

  The display screen of a destination position guidance system is shown. On the screen display, the current position 14 and the coordinate value 15 of the current position are displayed with the map as a background. Before the map printed on paper is scanned with the image scanner 2, the target position 16 is directly written on the map with a pen, and is digitized in the same manner as the map and displayed as a background. As the worker 22 moves, the position of the receiving antenna 4 changes, and the receiver 5 sequentially calculates the position where the receiving antenna 4 moves and outputs it to the portable terminal 7. The portable terminal 7 displays the current position 14 on the screen coordinate value corresponding to the position of the receiving antenna 4. The operator 22 can confirm the display of the current position 14 and the target position 16 on the screen, thereby confirming the distance and direction to the target position 16, so that the display of the current position 14 and the target position 16 can be moved to overlap. To the target position 16.

  Since the receiving antenna 4 is attached to the tip of the pole 8 having a height in order to receive the radio wave from the satellite 3 satisfactorily, it is necessary to accurately align the target position 16 and the current position 14 at the final stage. Holding the pole 8 in a vertical state, the pole 8 is moved so that the display of the current position 14 and the target position 16 completely overlap, and the display is matched.

  In FIG. 3, the target position 19 and the reference point 19a are directly written on the map 18 with the pen 18a and scanned at regular intervals with the scanner 2 to obtain the digital map 20. However, after the map 18 is captured, it is edited. May be.

  First, the map 18 may be scanned at regular intervals by the scanner 2 to obtain a digital map 20, and then the symbols of the target position 19 and the reference point 19 a may be written to the digital map 20 by using drawing software such as CAD or image processing software. . Further, the target position 19 and the reference point 19a may be written on the already acquired digital map 20.

  In FIG. 6, a reference station necessary for measuring correction information is installed at the first reference point 19a. However, if the method is the same as the method for determining the first latitude / longitude coordinate value, There is no restriction on the installation location, and it can be anywhere. In this case, the latitude / longitude coordinate value of the first reference point 19a is determined by the same method as the determination method of the latitude / longitude coordinate value of the second reference point 19a.

  In FIG. 7, when the single positioning method is used for the measurement of the first reference point 19a, a plurality of measurement results obtained by continuously observing for a certain time can be averaged. By averaging, more optimal data can be obtained.

  Furthermore, in FIG. 7, in measuring the latitude and longitude coordinate values of the first reference point 19a, a static method can be used in addition to the single positioning method, the differential method, or the kinematic method.

  When using the static method, as shown in FIG. 6, for example, the receiving antenna 4 is fixed to the first reference point 19 a using the leveling table 10 and the tripod 11, and the receiver 12 continuously observes for a certain period of time. The latitude and longitude coordinate values of the reference point 19a are recorded by performing baseline analysis together with the data obtained by continuously observing the latitude and longitude coordinate values in the same time zone at the same reference point. It can be measured. The measurement result is output to the portable terminal 7 and recorded in the portable terminal 7.

  In the conversion using the conversion formula of FIG. 11, since the display coordinate value and the orthogonal coordinate value that are the conversion source always include an error, a calculation method that considers the error may be used. Further, although the reference point 19a is set to two points, the conversion formula may be obtained using the least square method using three or more points. Furthermore, although the scales of the X axis and the Y axis are handled in common in the conversion formula of FIG. 11, the scales may be obtained individually for each axis, or the distortion of the drawing may be removed using an affine transformation method or the like. Absent.

It is a figure which shows the ruler and pen for filling in the map printed on paper, the target position, and a reference point. It is a figure which shows the target position and the reference point which were written in the map printed on paper. It is a figure which shows the image scanner and portable terminal which scan the map printed on paper. It is a figure which shows the display coordinate system of a digital map. It is a figure which shows reading of the display coordinate value of a reference point. It is a figure which shows the measurement of the latitude longitude coordinate value by the position sensor of the 1st reference point. It is a figure which shows the measurement of the latitude longitude coordinate value by the position sensor of the 2nd reference point. It is a figure which shows the measurement of the latitude longitude coordinate value by the position sensor of the 2nd reference point. It is a figure which shows coordinate transformation. It is a figure which shows a response | compatibility of the field reference point orthogonal coordinate value of 2 reference points, and a display coordinate value. It is a figure which shows the conversion formula of a display coordinate value. It is an apparatus block diagram of the target position guidance system. It is the screen of the portable terminal of a target position guidance system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mobile terminal 2 Image scanner 3 Satellite of satellite positioning system 4 Reception antenna of satellite positioning system 5 Receiver of satellite positioning system 6 Radio apparatus which communicates correction information 7 Mobile terminal 8 Pole 9 Antenna of satellite positioning system 10 Leveling table 11 Tripod 12 Receiver of satellite positioning system 13 Radio device communicating correction signal 14 Display of + mark indicating current position 15 Coordinate value of current position 16 Display of x mark indicating target position 17 Reference station of satellite positioning system 18 Map 18a Pen 18b Ruler 19 Target position 19a Reference point 19b Mesh 20 Digital map 21 Site 22 Worker

Claims (4)

  In the system that displays the positional relationship between the current position measured by the position sensor and the target position as the goal on the mobile terminal and guides to the target position, the step of writing the target position directly on the map printed on paper with the pen, the target position Scanning the map with the image scanner with an image scanner and importing it to the mobile terminal, defining the screen coordinate system for the captured map image, obtaining two or more reference point display coordinate values in the screen coordinate system, On-site reference point latitude / longitude coordinate value is measured by the position sensor and converted to a coordinate value in the Cartesian coordinate system, and the current position display coordinate value for displaying the current position measured by the position sensor on the screen of the mobile terminal A calculation step, a step of displaying a pointer + mark on the display coordinate value of the current position, and displaying a positional relationship between the current position and the target position on the portable terminal. The map printed on paper, by writing directly mark the target position, target position guidance method characterized by not requiring the input of the coordinate values of the target position to the mobile terminal.   A system for displaying a positional relationship between a current position measured by a position sensor and a target position as a goal on a portable terminal and guiding to the target position, a map printed on paper, an image scanner for scanning the map, It consists of a portable terminal, a GPS receiver and GPS antenna that serve as a position sensor for the satellite positioning system, and a radio that communicates the correction signal of the satellite positioning system. By directly writing the target position with a mark on a map printed on paper A destination position guiding apparatus characterized by not requiring input of a destination position coordinate value to a portable terminal.   A step of specifying a target position on a map image obtained by capturing a map in which a target position is written into a computer with an image scanner to acquire a map image or a map being acquired by a computer with an image scanner, and defining a screen coordinate system for the map image In the screen coordinate system, two or more reference points are set and the reference point display coordinate value is acquired, and the latitude / longitude coordinate value of the reference point is measured by the position sensor in the field and converted into an orthogonal coordinate system. A step of acquiring a reference point orthogonal coordinate value, a step of measuring a current position by the position sensor and calculating a display coordinate value, a pointer is set to the display coordinate value, and a positional relationship between the current position and a target position is displayed on a computer. And a target position guiding method comprising the steps of:   A map in which a target position is written is acquired by a computer with an image scanner to acquire a map image, or a map is acquired by a computer with an image scanner and a target position is specified on the acquired map image, and a screen coordinate system is defined for the map image. In the screen coordinate system, two or more reference points are set and the reference point display coordinate value is acquired, and the latitude / longitude coordinate value of the reference point is measured by the position sensor and converted into an orthogonal coordinate system at the site. Means for acquiring a reference point orthogonal coordinate value, means for measuring a current position by the position sensor and calculating a display coordinate value, and setting a pointer to the display coordinate value to display a positional relationship between the current position and a target position on a computer And a destination position guidance system.

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