Method for converting coordinate values of map data
First Claim
1. A method for converting coordinate values of map data, comprising:
- a map data loading step of loading, by a control unit, two-dimensional map data from a map data storage unit;
an XY coordinate converting step of defining an XY coordinate system with an origin of a central position of the two-dimensional map data loaded in the map data loading step, and converting coordinate values of objects constituting the two-dimensional map data into coordinate values in XY coordinate system; and
a coordinate value converting step of converting Y-axis coordinate values of the objects obtained through the XY coordinate converting step on a reduced scale at a reduction ratio predetermined according to the Y-axis coordinate values, and converting X-axis coordinate values thereof by substituting them into a predetermined X-axis coordinate value conversion function.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention relates to a method for converting coordinate values of map data, wherein three-dimensional effects are displayed on a screen by converting two-dimensional coordinate values of objects constituting a map without using a three-dimensional graphic library and an additional storage space. In the method of the present invention, two-dimensional map data for a certain area including a reference position are loaded from a map data storage unit and then moved with respect to the reference position and a sight line along which the two-dimensional map data are viewed from the reference position; an XY coordinate system with an origin of a central position of the moved two-dimensional map data is defined and coordinate values of objects constituting the two-dimensional map data are converted into coordinate values in the XY coordinate system; and Y-axis coordinate values obtained through the XY coordinate conversion of the two-dimensional map data are converted on a reduced scale at a reduction ratio predetermined according to the Y-axis coordinate values, and X-axis coordinate values of the objects in a digital map with the reduced Y-axis coordinate values are converted on an enlarged or reduced scale according to a predetermined X-axis coordinate value conversion function, thereby displaying the map on the screen while representing three-dimensional effects.
-
Citations
15 Claims
-
1. A method for converting coordinate values of map data, comprising:
-
a map data loading step of loading, by a control unit, two-dimensional map data from a map data storage unit;
an XY coordinate converting step of defining an XY coordinate system with an origin of a central position of the two-dimensional map data loaded in the map data loading step, and converting coordinate values of objects constituting the two-dimensional map data into coordinate values in XY coordinate system; and
a coordinate value converting step of converting Y-axis coordinate values of the objects obtained through the XY coordinate converting step on a reduced scale at a reduction ratio predetermined according to the Y-axis coordinate values, and converting X-axis coordinate values thereof by substituting them into a predetermined X-axis coordinate value conversion function. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A method for converting coordinate values of map data, comprising:
-
a map data loading step of loading, by a control unit, two-dimensional map data for an input area including a reference position from a map data storage unit;
a map data moving step of shifting and rotating coordinate values of the two-dimensional map data loaded in the loading step with respect to the reference position and a sight line along which the two-dimensional map data are viewed from the reference position;
an XY coordinate converting step of defining an XY coordinate system with an origin of a central position of the two-dimensional map data moved in the map data moving step, and converting coordinate values of objects constituting the two-dimensional map data into coordinate values in the XY coordinate system; and
a coordinate value converting step of converting Y-axis coordinate values of the objects obtained through the XY coordinate converting step on a reduced scale at a reduction ratio predetermined according to the Y-axis coordinate values, and converting X-axis coordinate values thereof by substituting them into a predetermined X-axis coordinate value conversion function. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
-
Specification