  To combine information from measurements of the redshift-space power spectrum
from spectroscopic data with angular weak lensing, galaxy clustering and
galaxy-galaxy lensing power spectra from photometric surveys (i.e. the $3
\times 2$ point statistics), we must account for the covariance between the two
probes. Currently any covariance between the two types of measurements is
neglected as existing photometric and spectroscopic surveys largely probe
different cosmological volumes. This will cease to be the case as data arrives
from Stage-IV surveys. In this paper we derive an analytic expression for the
covariance between photometric 2D angular power spectra and the 3D
redshift-space power spectrum for Gaussian fields under the plane-parallel
approximation. We find that the two probes are covariant on large radial
scales, but because the information content of these modes is extremely low due
to sample variance, we forecast that it is safe to neglect this covariance when
performing cosmological parameter inference.
