  Magnetic field source localization and imaging happen at different scales.
The sensing baseline ranges from meter scale such as magnetic anomaly
detection, centimeter scale such as brain field imaging to nanometer scale such
as the imaging of magnetic skyrmion and single cell. Here we show how atomic
vapor cell can be used to realize a baseline of 109.6 {\mu}m with a magnetic
sensitivity of<EMAIL_ADDRESS>and a dynamic range of 2062-4124nT.We
use free induction decay (FID) scheme to suppress low-frequency noise and avoid
scale factor variation for different domains due to light non-uniformity. The
measurement domains are scanned by digital micro-mirror device (DMD). The
currents of 22mA, 30mA, 38mA and 44mA are applied in the coils to generate
different fields along the pumping axis which are measured respectively by
fitting the FID signals of the probe light. The residual fields of every domain
are obtained from the intercept of linearly-fitting of the measurement data
corresponding to these four currents. The coil-generated fields are calculated
by deducting the residual fields from the total fields. The results demonstrate
that the hole of shield affects both the residual and the coil-generated field
distribution. The potential impact of field distribution measurement with an
outstanding comprehensive properties of spatial resolution, sensitivity and
dynamic range is far-reaching. It could lead to capability of 3D magnetography
for small stuffs and/or organs in millimeter or even smaller scale.
