Map road annotating method of navigation terminal
A technology for navigation terminals and roads, applied to maps/plans/charts, educational tools, instruments, etc., which can solve problems such as not taking into account the density distribution of road annotations in the screen, and achieve improved annotation effects, easy implementation, and simple principles Effect
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[0037] next figure 1 The flow chart shown, in combination with the above-mentioned technical solutions, further describes the present invention by means of implementation examples.
[0038] An implementation example of the present invention is to display the national road network under the scale of 1:25000 on the navigation terminal device, and take a certain display screen as an example to introduce the way of marking the road. The steps are as follows:
[0039] 1. The screen size is about 800*480 pixels, and the screen resolution is 96pixel / inch. One foot is about 0.0254 meters, and the display scale is 1:25000. According to the actual distance represented by one pixel on the screen is 6.614583333 meters, then the coordinate range that can be displayed on the screen is 5291.666667 meters*3175 meters.
[0040] 2. Under the Universal Mercator projection, if the coordinates of a new point in a certain screen are P0(X0, Y0), the geographic coordinates that can be displayed on ...
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