  Scanning diamond magnetometers based on the optically detected magnetic
resonance of the nitrogen-vacancy centre offer very high sensitivity and
non-invasive imaging capabilities when the stray fields emanating from
ultrathin magnetic materials are sufficiently low (< 10 mT). Beyond this
low-field regime, the optical signal quenches and a quantitative measurement is
challenging. While the field-dependent NV photoluminescence can still provide
qualitative information on magnetic morphology, this operation regime remains
unexplored particularly for surface magnetisation larger than $\sim$ 3 mA.
Here, we introduce a multi-angle reconstruction technique (MARe) that captures
the full nanoscale domain morphology in all magnetic-field regimes leading to
NV photoluminescence quench. To demonstrate this, we use [Ir/Co/Pt]$_{14}$
multilayer films with surface magnetisation an order of magnitude larger than
previous reports. Our approach brings non-invasive nanoscale magnetic field
imaging capability to the study of a wider pool of magnetic materials and
phenomena.
