Method and apparatus for displaying a map
First Claim
1. A navigation apparatus for displaying a map that includes building symbols representing buildings, comprising:
- a map-drawing unit configured to draw a map of an area from map data and building symbols having predetermined shapes at a position corresponding to positions of buildings on the map at a selected map scale; and
a displaying unit configured to display the drawn map,wherein, in a nighttime-map displaying mode, the map-drawing unit draws the entirety of each building symbol in a bright color to generate the map when the map scale exceeds a predetermined threshold and draws a part of each building symbol in a bright color to generate the map when the map scale does not exceed the predetermined threshold, andwherein, when the map scale does not exceed the predetermined threshold in the nighttime-map displaying mode, the map-drawing unit draws a portion of at least one building symbol with a lower brightness when the position of the at least one building symbol shifts to the top of the map.
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Abstract
A navigation apparatus for displaying a map that includes building symbols representing buildings. The navigation apparatus includes a map-drawing unit that draws the map of an area from map data on shapes and positions of the building symbols at a selected map scale and a displaying unit that displays the drawn map. In the navigation apparatus in a nighttime-map displaying mode, the map-drawing unit draws the entirety of each building symbol in a bright color to generate the map when the map scale exceeds a predetermined threshold and draws part of the building symbol in a bright color to generate the map when the map scale does not exceed the predetermined threshold.
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Citations
15 Claims
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1. A navigation apparatus for displaying a map that includes building symbols representing buildings, comprising:
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a map-drawing unit configured to draw a map of an area from map data and building symbols having predetermined shapes at a position corresponding to positions of buildings on the map at a selected map scale; and a displaying unit configured to display the drawn map, wherein, in a nighttime-map displaying mode, the map-drawing unit draws the entirety of each building symbol in a bright color to generate the map when the map scale exceeds a predetermined threshold and draws a part of each building symbol in a bright color to generate the map when the map scale does not exceed the predetermined threshold, and wherein, when the map scale does not exceed the predetermined threshold in the nighttime-map displaying mode, the map-drawing unit draws a portion of at least one building symbol with a lower brightness when the position of the at least one building symbol shifts to the top of the map. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14)
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10. A navigation apparatus for displaying a map with reference to map data, comprising:
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a map-drawing unit configured to draw a bird'"'"'s-eye view obtained by virtually viewing a display area on the map from a viewpoint in midair above a predetermined reference position in the display area; a building-density calculating unit configured to estimate building densities of individual viewing angle regions obtained by dividing an area extending from the display area in the viewing direction of the display area in a nighttime-map displaying mode; a map-image generating unit configured to adjust emphasis levels for displaying the respective viewing angle regions and draw a night-sky image representing city lights at the emphasis levels on portions of the horizon to generate a map image in a nighttime-map displaying mode, the emphasis levels increasing as the estimated building densities of the respective viewing angle regions increase and the portions corresponding to the respective viewing angle regions; and a displaying unit operable to display a generated map image.
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15. A navigation apparatus for displaying a map, comprising:
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a map-drawing unit configured to draw a bird'"'"'s-eye view of a display area on the map; a land-area calculating unit configured to calculate a land area of a boundary corresponding to the horizon of the bird'"'"'s-eye view in a nighttime-map displaying mode; a map-image generating unit configured to draw a night-sky image representing city lights on a land area; and a displaying unit configured to display a generated map image, wherein, when the map scale does not exceed the predetermined threshold in the nighttime-map displaying mode, the map-drawing unit draws a portion of at least one building symbol with a lower brightness when the position of the at least one building symbol shifts to the top of the map.
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Specification