File:Map of Titan - April 2011.jpg

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English: This global digital map of Saturn's moon Titan was created using images taken by the Cassini spacecraft's imaging science subsystem (ISS).

The images were taken using a filter centred at 938 nanometres, allowing researchers to examine variations in albedo (or inherent brightness) variations across the surface of Titan. Because of the scattering of light by Titan's dense atmosphere, no topographic shading is visible in these images.

The map is an equidistant projection and has a scale of 4 kilometres per pixel. Actual resolution varies greatly across the map, with the best coverage (close to the map scale) along the equator near the centre of the map at 180 degrees west longitude and near the left and right edges at 0 and 360 degrees west longitude. The worst coverage is on the leading hemisphere (particularly around 120 degrees west longitude) and in some northern latitudes. Coverage in the northern polar region continues to improve as the north pole comes out of shadow after Titan's northern vernal equinox in August 2009. Large dark areas, now known to be liquid-hydrocarbon-filled lakes, have been documented at high latitudes.

This map is an update to the version released in February 2009. Data from the last two years, including the most recent data in the map from April 2011, have improved coverage in the southern trailing hemisphere and over portions of the north polar region.

The mean radius of Titan used for projection of this map is 2,575 kilometres. Titan is assumed to be spherical until a control network -- a model of the moon's shape based on multiple images tied together at defined points on the surface -- is created at some point in the future.
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来源 CICLOPS
作者 NASA/JPL-Caltech/Space Science Institute

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当前2011年10月27日 (四) 14:302011年10月27日 (四) 14:30版本的缩略图4,374 × 2,430(2.25 MB)Originalwana{{Information |Description ={{en|1=This global digital map of Saturn's moon Titan was created using images taken by the Cassini spacecraft's imaging science subsystem (ISS). The images were taken using a filter centred at 938 nanometres, allowing rese

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