  Telescope and detector developments continuously enable deeper and more
detailed studies of astronomical objects. Larger collecting areas, improvement
in dispersion and detector techniques, and higher sensitivities allow detection
of more molecules in a single observation, at lower abundances, resulting in
better constraints of the targets physical and chemical conditions.
Improvements on current telescopes, and not to mention future observatories,
both in space and on the ground, will continue this trend, ever improving our
understanding of the Universe. Planetary exploration missions carry
instrumentation to unexplored areas, and reveal details impossible to observe
from the Earth by performing in-situ measurements. Space based observatories
allow observations of object at wavelength ranges absorbed by the Earths
atmosphere. The depth of understanding from all of these studies can be greatly
enhanced by combining observations: ground-based and space-based,
low-resolution and high-resolution, local and global-scale, similar
observations over a broader or different spectra range, or by providing
temporal information through follow-ups. Combined observations provide context
and a broader scope of the studied object, and in this white paper, we outline
a number of studies where observations are synergistically applied to increase
the scientific value of both datasets. Examples include atmospheric studies of
Venus, Mars, Titan, comets, Jupiter, as well as more specific cases describing
synergistic studies in the Juno mission, and ground-based radar studies for
near Earth objects. The examples aim to serve as inspiration for future
synergistic observations, and recommendations are made based on the lessons
learned from these examples.
