{
  "$type": "site.standard.document",
  "description": "Disclosed is a three-dimensional map wherein scale is preserved. Landscape feature data, wherein roads, buildings, and other landscape features are drawn three-dimensionally, is prepared, and a three-dimensional map is drawn on the basis of the data. The landscape feature data is generated by a…",
  "path": "/patents/993966",
  "publishedAt": "2013-01-16T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "G01C21/3638",
    "GEO TECHNICAL LAB CO LTD [JP]"
  ],
  "textContent": "Disclosed is a three-dimensional map wherein scale is preserved. Landscape feature data, wherein roads, buildings, and other landscape features are drawn three-dimensionally, is prepared, and a three-dimensional map is drawn on the basis of the data. The landscape feature data is generated by a method that projects an actual landscape feature (CST2) upon a projection plane (PL2) with parallel lines along the projection direction (PRJ), or in other words, a parallel projection, rather than a perspective projection. The landscape feature data is comprised of either two-dimensional raster data or polygonal data that draws a parallel projected projection map. It is possible to draw the three-dimensional map by only drawing the prepared landscape feature data, without rendering or other load-intensive processing. Unlike the perspective projection, with the parallel projection, the positional relations and scale of shapes between buildings is preserved, thereby facilitating a three-dimensional map wherein scale is preserved.",
  "title": "THREE-DIMENSIONAL MAP DRAWING SYSTEM"
}