code: def dtype(cls, dataset, dimension):
      dim = dataset.get_dimension(dimension, strict=True)
      if dim in cls.geom_dims(dataset):
          col = cls.geo_column(dataset.data)
          return dataset.data[col].dtype.subtype
      return dataset.data[dim.name].dtype
  
imports: import sys
  from collections import defaultdict
  import numpy
  import pandas
  from ..dimension import dimension_name
  from ..util import isscalar, unique_array, unique_iterator
  from .interface import DataError, Interface
  from .multipath import MultiInterface, ensure_ring
  from .pandas import PandasInterface
label_desc: Use image node_id 10 for calling the SpatialPandasInterface obj's underlying member method code with example usage: obj.dtype(cls, dataset, dimension) and returns: dataset, dataset