Abstract:
A method of recording, into a data base of a navigation and positioning system, of geographic data of geographic places selected in a predetermined geographic zone, by selecting two points on a geographic map of said zone, defining these points by their geographic co-ordinates and by their position co-ordinates on the map, establishing the relationship between the geographic and position co-ordinates, defining the points to be recorded by their position co-ordinates, calculating for these position co-ordinates from the relationship, the geographic co-ordinates and entering the latter into the data base.

Description:
TECHNICAL FIELD 
     The invention relates to a method of recording into a storage, in particular of a navigation and positioning or a locating system, of geographic data of geographic places such as the points or spots of an itinerary or route in a predetermined geographic zone and an arrangement for bringing this method into operation. 
     BACKGROUND ART 
     The navigation and positioning or locating systems owing to their digital bases of geographic data of a given geographic zone are conceived or designed for guiding their users along a pre-established itinerary or route and for checking the accuracy of their positions during a displacement or travel. 
     One already knows methods and arrangements of the type defined hereinabove which allow a user to add his own personal data such as a fishing pots or zones for a seaman or sailor, restaurants interesting for a motorist, monuments along a pre-established itinerary or route, mushrooms or flowers zones for a tripper, walker or excursionist. 
     The known method and arrangements are based upon the use of a digitalizing table or of an electronic map recorded in an appliance or device on which the user would electronically plot the points or spots he wishes to define. 
     Now these known methods and arrangements exhibit the major inconvenience that a digitalizing table or an electronic map to be used is cumbersome or bulky and heavy and therefore usable with difficulty for many leisure or spare time utilizations where it is mandatory to have the lightest possible equipment available and for professional utilizations requiring a minimum bulkiness or size. 
     SUMMARY OF THE INVENTION 
     The object of the present invention is to provide a method and an arrangement of the kind defined hereinabove which would cope with the inconveniences of the state of prior art. 
     To reach that goal, the method according to the invention includes the steps of selecting two points on a geographic map of the geographic zone in which points corresponding to geographic places or spots should be indicated, defining these points by their geographic co-ordinates such as their longitude and their latitude and by their co-ordinates of position on the map, establishing the correlation between the geographic and position co-ordinates, defining the points to be recorded by their position co-ordinates, calculating from these position co-ordinates the geographic co-ordinates from or according to the correlation and entering the calculated geographic co-ordinates into the said storage. 
     The arrangement for bringing the process into operation is characterized in that it comprises a device for establishing a system of polar co-ordinates on a geographic map and for establishing the polar co-ordinates of the points lying on the map in this system, a recording device for the recording by the user of geographic co-ordinates and for receiving polar coordinates and calculation means adapted for calculating, for polar co-ordinates, the geographic co-ordinates. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The invention will be better understood and further objects, characterizing features, details and advantages thereof will appear more clearly as the following explanatory description proceeds with reference to the attached diagrammatic drawings given by way of non limiting examples only illustrating several presently preferred specific embodiments of the invention and in which: 
     FIG. 1 is a diagrammatic perspective view of an arrangement according to the invention; 
     FIG. 2 shows the arrangement according to FIG. 1 in the folded-back state; 
     FIG. 3 is a view in section taken upon the line III—III of FIG. 4 of a second embodiment according to the invention; and 
     FIG. 4 is a view in section taken along the line IV—IV of FIG.  3 . 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The arrangement according to the invention, which allows its user to enter, into a digital geographic data base, additional data for personalizing the content of the bases, essentially comprises a pivoting electronic rule  1  comprising a rule element  2  mounted onto a circular base  3  pivoting about a central axis and a sight device  6  provided as a slider, runner or like traveller axially displaceable on the rule element  2 . The point of sight  7  of the sight slider appears in the center of a window  8  and the rule element  2  comprises a longitudinal slot  9  in order that, when the rule is placed upon a geographic map, the latter be visible through the window  8  in any axial position of the slider on the rule element  2 . The base  3  also comprises, about the axis of rotation  4 , a window shown at  10  in order that the map be visible through this window. 
     As shown on FIG. 2, the bottom face of the base  3  carries spikes  11  which permit to hold the pivoting rule  1  against motion on the map. This figure moreover shows that the rule element  2  may be folded back about a hinge  12  to reduce its cumbersomeness. The rule could of course be provided so as to be extensible. 
     The pivoting rule  1  further comprises an electronic device which permits the measurement of the distance of the movable sight point  7  from the pivot axis  4  and of the angle of pivoting of the rule element. This device thus is capable of defining points which appear in the sight  7  as polar co-ordinates in a system of polar co-ordinates of which the origin is located on the pivot axis  4 . The electronic device would measure the angle and the distance of the sight points in this system. 
     The pivoting electronic rule  1  is advantageously used with a navigation and positioning or locating apparatus (not shown) into the digital base of geographic data of which will be entered the geographic points chosen by the user. The data recording device of this apparatus  1  serves as an interface means of dialogue between the navigation apparatus and the pivoting electronic rule owing to its alphanumerical keyboard and its screen. For that purpose, the rule is provided with a means for connection with the recording device, which could consist of an electric power-cord  13  as in the example shown, an infrared connection or a radio or whireless connection. Of course, the arrangement according to the invention further comprises a software for the management of the user and dialogue interface between the rule and the recording device. 
     The circular base  3  of the rule  1  is further provided a with a member  14  for the transfer, to the recording device, of the measured polar co-ordinates. In the example shown, this member consists of a push-button. 
     The operation and utilization of the arrangement according to the invention will be described hereinafter. 
     If the user wishes to personalize the geographic data bases of his navigation and positioning apparatus, he lays the geographic map of the geographic region involved down upon a flat or nearly flat surface such as a table, a wall, a ground or floor and places the pivoting electronic rule  1  according to the invention upon the map. The rule will be held against motion thereon with the assistance of the fastening spikes  11 . 
     Before proceeding with entering the desired geographic points into the digital base, the user should at first enter into the recording device by means of the alphanumerical keyboard, the geographic co-ordinates, i.e. the longitude, the latitude of two points of the map. He should enter the co-ordinates of the point lying on the pivot axis  4  and forming the origin of the polar system and those of any point remote from the pivot axis, for example of a point located, with respect to the axis, on the other side of the data zone to be recorded. By means of the rule  1 , by positioning the slider  6  upon or above this second point, one also establishes the position co-ordinates on the map The recording button permits to transfer these data to the recording device so that the software may establish the correlation between the geographic and position co-ordinates of both reference points by establishing the scale of the map and the initial polar angle with respect to the geographic North. 
     Then the user may automatically enter any point, trace, particular line, particular zone of his map which he desires to record by placing the sight slider  6  upon or above the desired point and by operating the transfer of the polar co-ordinates of these points to the recording device by actuation of the recording button. Owing to the correlation previously established, the software is capable of then converting the polar co-ordinates into geographic co-ordinates which will then be recorded into the digital data base of the navigation and positioning apparatus. 
     FIGS. 3 and 4 show another embodiment of the arrangement according to the invention. In this embodiment, the electronic rule is provided by a telescopic rod  17  mounted in stationary relationship at one end within a flat box  18  of oval shape and itself rotatably mounted in an outer casing  19  through the medium of top and bottom pivots designated at  20  and  21 , respectively. The casing is adapted to be held against motion upon a geographic map for example by means of spikes (not shown) like the spikes  11  of the first embodiment. The upper pivot  20  consists of a stud projecting from the top face  31  of the box and engaging a suitable hole formed in the internal face of the top wall  22  of the outer casing  19 . The bottom pivot  21  projects from the internal face of the bottom wall  23  of the casing  19  and extends through an opening  24  in the centre of the bottom wall  25  of the box  18  and carries at its free end a toothed sector or segment gear  26  with an angular extension of 120°. This sector therefore lies inside of the box  18 . The toothing on the arcuate face  27  of the sector  26  meshes with a pinion  29  which is freely rotatably mounted within the box  18  while being carried by the lower wall,  25  and the upper wall  31 , respectively, of the box. The pinion  29  carries a disk  33  which is provided at its periphery with measuring scale elements permitting a measuring sensor  34  fastened underneath the internal face of the top wall  31  of the box  18  to measure the angle of rotation of the box and thus of the telescopic rod  17 . The co-operation of the sector  26  and of the pinion  29  permits to measure, with a very great precision or accuracy, the angular positions of the telescopic rod  17  owing to the step-up effect which these parts provide. 
     This telescopic rod comprises, as being fastened at the free end of the telescopic end element  36 , a sight member forming the slider  6  of the first embodiment, which is displaceable along the axis of the rod. This end is further provided with a member forming a handle or grip  37  for the manipulation of the rod. The length of the rod is measured by names of a cable  39  of which one end is fastened to the telescopic end element  36  whereas the other end is wound about a drum  38  rotatably mounted within the box  18  through the medium of a pin or shaft  40  against a return spring. The drum is made fast to for unitary rotation with a disk  41  which comprises at its periphery elements forming a scale and which permit the measurement of the angle of rotation of the disk as well as of the drum by means of an optical sensor  42  mounted onto the internal face of the top wall  22  of the box  18  at the level of the periphery of the disk  41 . The measured angle of rotation is representative of the length of the rod. Upon the bottom face of the top wall is also mounted a plate with printed circuits  44  which carries the electronic components for the processing of the data supplied by both sensors with a view to determining the polar co-ordinates of the different points lying on the map and of which the geographic co-ordinates are desirably to be entered into the data base. The output terminals of the electric circuits of the map are electrically connected to an outer cable through the medium of a connector  46  mounted in the peripheral wall of the outer casing  19 .