Gnomonic projection of Titan's surface seen from Huygens

This gnomonic projection of DISR images from ESA’s Huygens probe combines 17 image triplets, projected from an altitude of 800 metres. The area covered is approximately 1300 metres across (north at the top of the image). The smallest visible objects visible are less than five metres across, and the dark channels are 30-40 metres wide.

To construct this projection, the direction of every pixel in each of the three imagers was measured and expressed as a nadir and azimuth angle in a spherical co-ordinate system centred on the image. The images were then spliced together using one of several projection algorithms (in this case ‘gnomonic’) to produce a full mosaic.