Patent ID: 7761230
Filing Date: 2010-07-20
Classification: G01C,G09B

Abstract:
1. An electronic device having a navigation function comprising: a display; memory configured to store building data associated with buildings to be displayed on the display, the building data including plane data having two-dimensional coordinates and further including height data; a judging section that judges whether a mode is a daytime mode or a nighttime mode; a display controlling section that controls the display such that, when the judging section judges that the mode is the daytime mode, a building is displayed on a display map based on the building data, and when the judging section judges that the mode is the nighttime mode, the display controlling section controls the display to display light spots of pixels in place of the building, wherein the light spots correspond to the plane data of the building data on the display map and have a shape that is distinct from a shape of the building; and a decimating section that decimates the building data based on the unit of a bar scale of a map appearing on the display, wherein, when the map scale is not greater than a predetermined threshold value, the decimating section causes a first number of pixels corresponding to the plane data of the building data to light up, and wherein, when the map scale is greater than the predetermined threshold value, the decimating section causes a second number of pixels corresponding to the plane data to light up, the second number of pixels being smaller than the first number of pixels.