Images #1, 3, 5, 7 and 9-10, were taken by MarsExpress satellite, show odd, highly organized geometrical structures, that follow topology and respect laws of perspectivity. Pictures #2, 4, 6, 8 and 11-12 are corresponding crops, converted to BW, contrast enhanced and slightly sharpened by a very accurate S-spline algorithm. The whole image enhancment process was optimized to not introduce additional artefacts. Extensive image analysis showed, that no image processing algorithm is known, that may have created the said structures systematically or by chance. Cosine transform/inverse cosine tranfsorm (DCT/IDCT) artefacts - so called JPEG pixelation - must be disregarded, since uncompressed TIF imagary is available and detail resolution (raw data unit DCT blocksize) is mapped down to about 2x2pixel. Map colorization programs follow given 2D/3D landscape atrributes and are not known to create highly organized, distinctive, geometric patterns on their own. Possible patchwork artefacts (mosaics) can be excluded, since the images in question were taken in a single stripe shot by MarsExpress' NADIR- and high resolution stereo camera (HRSC). However a possible interaction between NADIR- and HRSC data can not be excluded; but no image from another location could be found, that shows similar or comparable patterns. Hence, the origin of the depicted structures must be considered as unknown. A detailed mission description can be found here. ESA/DLR/FU-B hi res image library can be browsed here.
Found Here: http://www.adenet.ch/halecrater.htm