The most direct effect of severing the corpus callosum would be that

The most direct effect of severing the corpus callosum would be that the cerebral hemispheres could not directly communicate, since the corpus callosum is the set of nerve fibers that unites both cerebral hemispheres, this structure is located in the midline of the brain, situating itself in the interhemispheric fissure and being mostly hidden from external observation when it is partially obscured by the Cortex.

Are you asking about a street map usage  if so here is your answer  a street map for a very limited area could simply be a bit map or a .jpg image.  but a more general map would probably store the streets as vectors.  but you shouldn't assume that there is one way to do it

C. a mature ovule of a plant.