My group chose the project of Exploring the Red Planet. We had to classify marks on Mar's surface into categories of either "fans" or "blotches". By studying and tracking these fans and blotches on the Martian's surface over time, it helps scientists calculate wind speed and direction. This information also helps scientists study the planet's climate. Scientists are not exactly sure how blotches and fans form, however they think it is the formation of a thin layer of carbon dioxide ice in certain seasons. The images of examples of blotches and fans that I am about to show you came from the High Resolution Imaging Science Experiment (HiRISE) which is a camera that orbits Mars.
Below are examples of fans and blotches that I copied from the Zooniverse observation section. This will hopefully give you a better understanding of the different shapes and what you are looking for.
Observation 1 has a lot of blotches. Blotches look like splatters. Observation 2 has a lot of definite fans. Fans look more like a spray shape. Observations 4 and 5 have a combination of both. observation 6 is a little different with a single blotch. I found this very interesting so I found myself doing a lot of observations
...to be exact! Who wouldn't want a chance to be able to see real, up-close photos of another planet?!
...to be exact! Who wouldn't want a chance to be able to see real, up-close photos of another planet?! 
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