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The OSIRIS-REx Asteroid Sample Return Mission is the third mission in NASA'sNew Frontiers Program and is the first U.S. mission to return samples from anasteroid to Earth. The most important decision ahead of the OSIRIS-REx team isthe selection of a prime sample-site on the surface of asteroid (101955) Bennu.Mission success hinges on identifying a site that is safe and has regolith thatcan readily be ingested by the spacecraft's sampling mechanism. To inform thismission-critical decision, the surface of Bennu is mapped using the OSIRIS-RExCamera Suite and the images are used to develop several foundational dataproducts. Acquiring the necessary inputs to these data products requiresobservational strategies that are defined specifically to overcome thechallenges associated with mapping a small irregular body. We present thesestrategies in the context of assessing candidate sample-sites at Bennuaccording to a framework of decisions regarding the relative safety,sampleability, and scientific value across the asteroid's surface. To createdata products that aid these assessments, we describe the best practicesdeveloped by the OSIRIS-REx team for image-based mapping of irregular smallbodies. We emphasize the importance of using 3D shape models and the ability towork in body-fixed rectangular coordinates when dealing with planetary surfacesthat cannot be uniquely addressed by body-fixed latitude and longitude.

Overcoming the Challenges Associated with Image-based Mapping of Small Bodies in Preparation for the OSIRIS-REx Mission to (101955) Bennu