ExoMars 2016 CaSSIS Raw-level Data Product Collection

CaSSIS CaSSIS (Colour and Stereo Surface Imaging System), is a high-resolution, 4.5 m per pixel (15 ft/pixel), colour stereo camera, designed for building accurate digital elevation models of the Martian surface. CaSSIS is designed to acquire targeted images of Mars at a rate of 10–20 images per day from a roughly circular orbit 400 km above the surface. Each image can be acquired in up to four colours and stereo capability is provided by the use of a novel rotation mechanism. A typical product from one image acquisition will be a 9.5 km × ∼45 km swath, in full colour and in stereo, and from one over-flight of the target thereby reducing atmospheric influences inherent in stereo and colour products from previous high resolution imagers. The Principal Investigator is Nick Thomas, from the University of Bern, Switzerland. The Raw_Data Collection The raw data collection contains the raw science and housekeeping data from the instrument and the data is released publicly on a daily basis with a six month lag from the data being obtained. Physically the collection is organised by science phase, then orbit range in groups of 100 orbits, then orbit. Housekeeping is then organised into a Housekeeping directory. Science data is organised into a Science directory, then by CaSSIS unique ID (to distinguish a single observation), then CaSSIS filter. The reason for this separation is that a single observation can have up to a few hundred raw frame lets per filter, so each science directory will contain from tens to hundreds of files. (Note a download from the PSA will also include accompanying browse images but these are actually housed in the Browse Collection.) A description of the raw data products can be found in the CaSSIS Experiment to Archive ICD (EAICD). This can be found under documents in the user interface or via the Document Collection in the PSA ftp distribution. A quick start guide can also be found at: