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A method of calibrating acceleration data signals from a set of accelerometers, and angular rate data signals from a set of gyroscopes within a combined GPS/IGS includes generating navigation data as a function of the acceleration data signals, the angular rate data signals, and prior navigation dat

A method of calibrating acceleration data signals from a set of accelerometers, and angular rate data signals from a set of gyroscopes within a combined GPS/IGS includes generating navigation data as a function of the acceleration data signals, the angular rate data signals, and prior navigation data. The method further includes combining the navigation data with GPS data via a Kalman filter, so as to produce corrected navigation data, navigation correction data, acceleration correction data and angular rate correction data. The method further includes modifying the acceleration data signals as a function of the acceleration correction data so as to calibrate the acceleration data signals, and modifying the angular rate data signals as a function of the angular rate correction data, so as to calibrate the angular data signals.

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A method of calibrating acceleration data signals from a set of accelerometers, and angular rate data signals from a set of gyroscopes within a combined GPS/IGS includes generating navigation data as a function of the acceleration data signals, the angular rate data signals, and prior navigation dat

A method of calibrating acceleration data signals from a set of accelerometers, and angular rate data signals from a set of gyroscopes within a combined GPS/IGS includes generating navigation data as a function of the acceleration data signals, the angular rate data signals, and prior navigation data. The method further includes combining the navigation data with GPS data via a Kalman filter, so as to produce corrected navigation data, navigation correction data, acceleration correction data and angular rate correction data. The method further includes modifying the acceleration data signals as a function of the acceleration correction data so as to calibrate the acceleration data signals, and modifying the angular rate data signals as a function of the angular rate correction data, so as to calibrate the angular data signals. playing said roads with the two-dimensional outlines thereof represented by said polygons, using said road polygon data. 6. A road map display method comprising the steps of: preparing road polygon data in which the respective roads that are to be displayed are expressed by polygons; preparing traffic lane polygon data in which the respective traffic lanes within said roads are expressed by polygons; and displaying said roads and the respective traffic lanes within said roads using said road polygon data and traffic lane polygon data. 7. The road map display method according to claim 6, further comprising the steps of: preparing guide line data that expresses guide lines which are set within said respective traffic lanes; and displaying a guide mark positioned within a selected single traffic lane using said guide line data. 8. A road map display method comprising the steps of: preparing road network data in which intersections are modeled as nodes and roads are modeled as links that connect said nodes; preparing city map data in which roads are represented with the two-dimensional outlines thereof; dynamically preparing road polygon data, in which respective roads are expressed by polygons each of which, as such, is representative of the two-dimensional outline of each of said roads, on the basis of said road network data and said city map data in cases where there is a need to display a road map; and displaying said roads with the two-dimensional outlines thereof represented by said polygons, using said road polygon data. 9. A medium readable by a machine carrying a program of instructions for execution by said machine to perform the steps of: preparing road polygon data in which respective roads are expressed by polygons each of which, as such, is representative of the two-dimensional outline of each of said roads; and displaying said roads with the two-dimensional outlines thereof represented by said polygons, using said road polygon data. 10. A road map display device comprising: a road map data receiving part which receives road map data that has road polygon data and intersection polygon data, wherein said road polygon data expresses respective roads by road polygons each of which, as such, is representative of the two-dimensional outline of each of said roads, and wherein said intersection polygon data expresses respective intersections by intersection polygons each of which, as such, is representative of the two-dimensional outline of each of said intersections; and a display part which selects a part of said road polygon data for a plurality of roads that are to be displayed and selects a part of said intersection polygon data for at least one intersection connecting said plurality of roads from said road map data, and displays said plurality of roads and said at least one intersection with the two-dimensional outlines thereof represented by said road and intersection polygons, using said selected parts of said road polygon data and guiding intersection polygon data. 11. A road map display device comprising: a road map data receiving part which receives road map data that has road polygon data and guiding intersection polygon data; traffic jam information receiving part which receives traffic jam information that indicates end positions of tailbacks of cars; a polygon dividing part which selects said road polygon data or said intersection polygon data for a road or intersection in which the end positions of the tailbacks of cars are present from said road map data, and divides said selected road polygon data or intersection polygon data into a region inside said tailbacks of cars and a region outside said tailbacks of cars at said end positions; and a display part which displays regions of roads and intersections in which said tailbacks of cars are present, using the region of said road polygon data or intersection polygon data inside said tailbacks of cars in which said end p ositions are present and which have been divided by said polygon dividing part, and said road polygon data and intersection polygon data for roads and intersections that are continuously present along said tailbacks of cars from the region inside said tailbacks of cars. 12. A road map display method comprising the steps of: receiving road map data which has road polygon data and intersection polygon data, wherein said road polygon data expresses respective roads by road polygons each of which, as such, is representative of the two-dimensional outline of each of said roads, and wherein said intersection polygon data expresses respective intersections by intersection polygons each of which, as such, is representative of the two-dimensional outline of each of said intersections; selecting a part of said road polygon data for a plurality of roads that are to be displayed, and selecting a part of said intersection polygon data for at least one intersection connecting said plurality of roads, from said road map data; and displaying said plurality of roads and said at least one intersection with the two-dimensional outlines thereof represented by said road and intersection polygons, using said selected parts of said road polygon data and guiding intersection polygon data. 13. A road map display method comprising the steps of: receiving road map data which has road polygon data and intersection polygon data; receiving traffic jam information which indicates final end positions of tailbacks of cars; selecting said road polygon data and intersection polygon data for a road or intersection in which said final end positions of the tailbacks of cars are present from said road map data, and dividing said selected road polygon data or intersection polygon data into an upstream side region and a downstream side regions at said final end positions; and displaying the regions of roads and intersections in which said tailbacks of cars are present using the downstream side region of said road polygon data or intersection polygon data in which said final end positions are present and which have been produced by division in said polygon dividing step, and said road polygon data and intersection polygon data for roads and intersections that are present further downstream from said downstream region along said tailbacks of cars. 14. A medium readable by a machine carrying a program of instructions for execution by said machine to perform the steps of: receiving road map data which has road polygon data and intersection polygon data, wherein said road polygon data expresses respective roads by road polygons each of which, as such, is representative of the two-dimensional outline of each of said roads, and wherein said intersection polygon data expresses respective intersections by intersection polygons each of which, as such, is representative of the two-dimensional outline of each of said intersections; selecting a part of said road polygon data for a plurality of roads that are to be displayed, and selecting a part of said intersection polygon data for at least one intersection connecting said plurality of roads, from said road map data; and displaying said plurality of roads and said at least one intersection with the two-dimensional outlines thereof represented by said road and intersection polygons, using said selected parts of said road polygon data and guiding intersection polygon data. 15. A computer-readable recording medium which carries polygonal road network data that has node data and link data that are mutually connected so that a road network is constructed, wherein the respective items of node data include intersection polygon data that expresses the shapes of the intersections of the respective nodes as polygons, and the respective items of link data include road polygon data that expresses the shapes of the respective roads between the polygons of the intersections at the both ends of the respective links as p olygons. 16. A road map display device comprising: polygonal road network data that has node data and link data that are mutually connected so that a road network is constructed, wherein the respective items of node data include intersection polygon data that expresses the shapes of the intersections of the respective nodes as polygons, and the respective items of link data include road polygon data that expresses the shapes of the respective roads between the polygons of the intersections at the both ends of the respective links as polygons; and a display part which receives said polygonal road network data, and prepares and displays polygonal road images consisting of polygons that express intersections and polygons that express roads. 17. The road map display device according to claim 16, wherein said display part can further perform route search or map matching operations using said polygonal road network data. 18. A road map display device comprising: polygonal road network data that has node data and link data that are mutually connected so that a road network is constructed, wherein the respective items of node data include intersection polygon data that expresses the shapes of the intersections of the respective nodes as polygons, and the respective items of link data include road polygon data that expresses the shapes of the roads of the respective links as polygons; city map data which has line segment data in which the shapes of map elements are expressed as sets of shape element points; and a display part which receives said polygonal road network data, and prepares and displays polygonal road images consisting of polygons that express intersections and polygons that express roads, and which prepares city map images using said city map data, and displays said polygonal road images superimposed on said city map images. 19. A road map display method comprising the steps of: receiving polygonal road network data that has node data and link data that are mutually connected so that a road network is constructed, wherein the respective items of node data include intersection polygon data that expresses the shapes of the intersections of the respective nodes as polygons, and the respective items of link data include road polygon data that expresses the shapes of the respective roads between the polygons of the intersections at the both ends of the respective links as polygons; and preparing and displaying polygonal road images consisting of polygons that express intersections and polygons that express roads, using said received polygonal road network data. 20. A medium readable by a machine carrying a program of instructions for execution by said machine to perform the steps of: receiving polygonal road network data that has node data and link data that are mutually connected so that a road network is constructed, wherein the respective items of node data include intersection polygon data that expresses the shapes of the intersections of the respective nodes as polygons, and the respective items of link data include road polygon data that expresses the shapes of the respective roads between the polygons of the intersections at the both ends of the respective links as polygons; and preparing and displaying polygonal road images consisting of polygons that express intersections and polygons that express roads, using said received polygonal road network data. 21. A computer-readable recording medium which carries polygonal road network data that has node data and link data that are mutually connected so that a road network is constructed, wherein the respective items of node data include intersection polygon data that expresses the shapes of the intersections of the respective nodes as polygons with coordinates based on the outline coordinates of respective intersections contained in city map data, and the respective items of link data include road polygon data that expresses the shapes of the roads