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Kasei Valles and Sacra Fossae ortho-image
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Kasei Valles and Sacra Fossae ortho-image.

December 4, 2009
Mars Express flew over the boundary between Kasei Valles and Sacra Fossae and imaged the region, acquiring spectacular views of the chaotic terrain in the area. The images are centred at 12°N / 285°E and have a ground resolution of about 21 m/pixel. They cover 225 x 95 km or 21.375 sq km, an area roughly half the size of the Netherlands.

This ortho-image was rectified using elevation data derived from a high-resolution Digital Terrain Model (DTM, obtained from HRSC data), such that distortions introduced during imaging are corrected. Such an image can be used to derive maps. Elevation data from the DTM are colour-coded and overlaid on the ortho-image so that elevation data and the image itself are displayed in a single scene. The scale is in metres.


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