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"legacypipe" is the code used to produce the DESI Legacy Imaging Surveys (aka the Legacy Surveys). It can processes individual exposures from many cameras, including the Dark Energy Camera on the Blanco telescope, the 90Prime camera on the Bok telescope, the Mosaic3 camera on the Mayall telescope (these three were used for the Legacy Surveys); as well as the Hyper-SuprimeCam on Subaru, the old SuprimeCam on Subaru, MegaCam on the Canada-France-Hawaii Telescope, and image products from the GALEX and WISE satellites. Legacypipe performs source detection, and then measurement via forward-modeling using the Tractor code. It generates coadded output images as well as catalogs, plus a variety of metrics useful for understanding the properties of the imaging.