2

My imported shapefiles (shp2pgsl) have the geometry type "MultiPolygonZM".

geom geometry(MultiPolygonZM),

What is this type of multi polygon? I can't find any useful information.

3

This type is a "4D" geometry type, so the geometry record contains X,Y, Z and M data.

Where X,Y,Z are 3D coordinates and M stands for measurement.

Take a look at this discussion: Is the Fourth Dimension used in GIS?

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