This paper describes the reduction pipeline of surface markings of the Citizen Science project Planet Four into a catalog of geo-located fan and blotch objects. Planet Four enlists the general public to map the shapes, directions, and sizes of the seasonal fans visible in orbital images. Over 80,000 volunteers have contributed to the Planet Four project, reviewing 221 images, from Mars Reconnaissance Orbiter’s HiRISE (High Resolution Imaging Science Experiment) camera.
Michael Aye,
Megan E Schwamb,
Ganna Portyankina,
Candice J Hansen,
Adam McMaster,
Grant R M Miller,
Brian Carstensen,
Christopher Snyder,
Michael Parrish,
Stuart Lynn,
Chuhong Mai,
David Miller,
Robert J Simpson,
Arfon M Smith
