Create interactive data explorer in estimateBiomass that includes nearshore and core area biomass densities, strata, etc.

[kstierhoff]

Add nearshore biomass densities and stratum polygons to existing i.map, or create new.

[kstierhoff]

Add nearshore strata boundaries and biomass intervals to estimateBiomass.

[kstierhoff]

Replaced extrapolated nearshore polygons and biomass estimates with sampled nearshore biomass density and polygons.