This video shows how to iteratively cleanup vectorized layers. We go through the command to apply the following operations
Filter polygons smaller than 1000 sq.meters.
Fill the gaps with the value of surrounding polygons
Conditionally replace an attribute value
Dissolve the polygons

The sample dataset can be downloaded from https://drive.google.com/uc?export=do...

Mapshaper Command Reference is at https://github.com/mbloch/mapshaper/w...