  In this paper we study geometric aspects of codes in the sum-rank metric. We
establish the geometric description of generalised weights, and analyse the
Delsarte and geometric dual operations. We establish a correspondence between
maximum sum-rank distance codes and h-designs, extending the well-known
correspondence between MDS codes and arcs in projective spaces and between MRD
codes and h-scatttered subspaces. We use the geometric setting to construct new
h-designs and new MSRD codes via new families of pairwise disjoint maximum
scattered linear sets.
