  Rotational transition lines of CO are one of the major tracers used to study
star forming regions and Galactic structures. A large number of observations of
CO rotational lines are covering the galactic plane, recently the $Planck$
collaboration release the first full sky coverage of J=1-0, J=2-1, and J=3-2 CO
lines at a resolution of 10', 5', and 5' FWHM. However, the measured signal in
$Planck$ detectors is integrated over large bandpass $(\Delta \nu)/\nu \simeq
0.2$. Consequently, the derived CO products are composite maps including
several rotational lines. In the 100 GHz $Planck$ channel, the two main lines
are the J=1-0 transitions of $^{12}$CO and $^{13}$CO at 115 and 110 GHz
respectively. In the present paper, we present and applied a method to
construct separate CO integrated intensity maps for the two isotopes. The
measurement of the $^{13}$CO rotational transitions provide an unprecedented
all-sky view of the Galaxy for this isotope.
