Difference between revisions of "Equirectangular Projection"
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A way of remapping the surface of a sphere on a flat image, where the image has an aspect ratio of 1:2 (height:width). The equirectangular projection was used in map creation since it was invented about 100 A.D. by Marinus of Tyre. | A way of remapping the surface of a sphere on a flat image, where the image has an aspect ratio of 1:2 (height:width). The equirectangular projection was used in map creation since it was invented about 100 A.D. by Marinus of Tyre. | ||
| − | In an equirectangular panoramic image all verticals stay vertical | + | In an equirectangular panoramic image all verticals stay vertical. Coordinates in the image relate linearily to pan and tilt angles in the real world. The poles (zenith and nadir) are located at the top respectively bottom edge and are stretched to the whole width of the image. |
Equirectangular images are displayed by [[Panorama_tools|PTViewer]], part of the Panorama Tools and some other viewers as spherical panorama. | Equirectangular images are displayed by [[Panorama_tools|PTViewer]], part of the Panorama Tools and some other viewers as spherical panorama. | ||
Revision as of 01:03, 22 December 2004
Definition
A way of remapping the surface of a sphere on a flat image, where the image has an aspect ratio of 1:2 (height:width). The equirectangular projection was used in map creation since it was invented about 100 A.D. by Marinus of Tyre.
In an equirectangular panoramic image all verticals stay vertical. Coordinates in the image relate linearily to pan and tilt angles in the real world. The poles (zenith and nadir) are located at the top respectively bottom edge and are stretched to the whole width of the image.
Equirectangular images are displayed by PTViewer, part of the Panorama Tools and some other viewers as spherical panorama.