{
  "$type": "site.standard.document",
  "description": "[Object] To realize three-dimensional display while visibility of characters is ensured in the 3D map. [Solution] In displaying a 3D map, a feature image is generated by perspective projection of the feature on the basis of a predetermined position of the point of sight and a predetermined…",
  "path": "/patents/939633",
  "publishedAt": "2016-08-03T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "G01C21/3673",
    "GEO TECHNICAL LAB CO LTD [JP]"
  ],
  "textContent": "[Object] To realize three-dimensional display while visibility of characters is ensured in the 3D map. [Solution] In displaying a 3D map, a feature image is generated by perspective projection of the feature on the basis of a predetermined position of the point of sight and a predetermined direction of the line of sight. In addition, a plate polygon on which characters are pasted is arranged in a virtual 3D space, and parallel projection is applied to the plate polygon so as to generate a character image. The plate polygon is arranged in a direction along a road and tilted from the ground surface. A tilt angle between the plate polygon and the ground surface is set on the basis of a display direction of the road and a display position of the character. Thus, by generating a feature image by perspective projection while generating a character image by parallel projection, negative effects such as crushing of distant characters can be avoided, whereby the characters can be displayed in three-dimensional shape without reducing visibility thereof.",
  "title": "THREE-DIMENSIONAL-MAP DISPLAY SYSTEM"
}