Orthogonal floor plan projection
![](https://upload.wikimedia.org/wikipedia/commons/thumb/0/00/USGS_7.5-minute_topographic_map_Astoria_46123b7.jpg/220px-USGS_7.5-minute_topographic_map_Astoria_46123b7.jpg)
The topographic map of the United States Geological Survey (1:24 000) shows objects in an orthogonal plan projection, true to scale and in true position.
An orthogonal floor plan projection ( Greek orthós correct, straight, upright) describes the distortion-free and true-to-scale representation of situations . Buildings, traffic routes, land cover, etc. a. are orthogonally integrated into a spatial reference system, e.g. B. measured a card.