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Euclid and LSST are two independent projects which complement each
other very well scientifically, but which have had significant
problems in working together due to non-scientific reasons. I will
first give a head-to-head comparison of the two projects, then discuss
several areas where collaboration would significantly improve the
results compared to each project working independently. These areas
include deblending objects, spectral information for/IR colours of
variable sources, galaxy morphologies, improving galaxy ellipticity
measurements for weak lensing studies, improved photometric redshifts,
more precise cluster mass estimates etc. I will describe some of the
possible areas of collaborations. Although Hungary is a member of
LSST but not Euclid, I will discuss ways of accessing Euclid data to
maximise scientific output. This talk is based largely on Rhodes et
al. (2017, ApJS, 233, 21) but I may add more recent material.
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