This sweeping view by ESA’s Mars Express extends from the planet’s south polar ice cap and across its cratered highlands to the Hellas Basin (top left) and beyond. Click here for an annotated image.
The image was acquired by the high-resolution stereo camera on ESA’s Mars Express on 25 February 2015. It is a ‘broom calibration’ image, acquired while the spacecraft performed a manoeuvre such that its camera pans over the surface far above the planet, at about 9 900 km.
The ground resolution is about 1 km per pixel at the closest point to the surface. The image was created using data from the nadir channel, the field of view of which is aligned perpendicular to the surface of Mars, and the colour channels of HRSC. These channels have been co-registered using ‘markers’ on the surface, such as a mountain or dark spot, to achieve a common geometry. That is, for each colour channel, these markers are overlain to produce the colour image. This process is not needed for ‘normal’ nadir observations because the geometry is known here, unlike in this broom observation.
Where expressly stated, images are licensed under the Creative Commons Attribution-ShareAlike 3.0 IGO (CC BY-SA 3.0 IGO) licence. The user is allowed to reproduce, distribute, adapt, translate and publicly perform it, without explicit permission, provided that the content is accompanied by an acknowledgement that the source is credited as ‘ESA/DLR/FU Berlin’, a direct link to the licence text is provided and that it is clearly indicated if changes were made to the original content. Adaptation/translation/derivatives must be distributed under the same licence terms as this publication.