Map display device
A map display device 11 according to the present invention includes: a display monitor 16 at which a display screen displaying a map is divided into a plurality of split areas and a set of weather information is displayed over each of the split areas; a satellite radio reception unit 111 that individually receives sets of weather information for a plurality of regions; and a control circuit 11 unit that extracts sets of weather information for regions containing an area of map displayed at the display monitor among the sets of the received weather information and allocates each of the sets of the extracted weather information for the regions to each of the split areas on the display screen, and that displays the map at the display monitor and also displays the sets of the extracted weather information for the regions by allocating each of the sets of the extracted weather information for the regions to each of the split areas on the display screen.
1. A map display device, comprising:
a display monitor at which a display screen displaying a map is divided into a plurality of split areas and a set of weather information is displayed over each of the split areas;
a receiver that receives a set of weather information for each of a plurality of pixels within a plurality of regions, wherein each of the split areas overlaps with at least one of the pixels;
a processor; and
a memory coupled to the processor;
wherein the processor is programmed to
calculate geographical positions on the displayed map that respectively correspond to center positions of the split areas;
select, for each of the split areas that overlaps with a plurality of the pixels, one of the pixels containing the calculated geographical position of the split area;
extract, for each of the split areas that overlaps with a plurality of the pixels, the set of weather information for the selected pixel among the sets of weather information; and
display the map at the display monitor and also display the sets of the extracted weather information for the pixels superimposed on the map by allocating each of the sets of the extracted weather information for the pixels to each center position of each of the split areas on the display screen.
2. A map display device according to claim 1 , wherein:
the display screen is divided into m×n (m and n each represents an odd number) split areas that are set in a two-dimensional array; and
the map display device further comprises a scroll controller programmed to scroll the map in response to a depression of the display screen at the display monitor so as to set a geographical position on the map corresponding to a depressed position to a center of the display screen.
3. A map display device according to claim 2 , wherein:
once the scroll controller has finished scrolling the map, the processor calculates the geographical positions corresponding to centers of the split areas on the map currently on display and extracts the sets of weather information for the regions containing the calculated geographical positions among the sets of the received weather information.
4. A map display device according to claim 1 , wherein:
the weather information indicates wind direction, wind strength, temperature, humidity, precipitation per unit time, long-term precipitation, duration of sunshine per unit time or barometric pressure or humidity.
5. A navigation system equipped with a map display device according to claim 1 .