Topography cannot currently be tagged with regular or material tags. This means you cannot call out sod, asphalt, gravel, or any material on the site topography.
1: Why are there objects in Revit that cannot be tagged?
2: Why are there objects in Revit that cannot have material tags?
For example: Split surfaces on topography to define new or existing materials, such as paving, soils, grassed areas, painted parking lines, etc. These should all be able to be tagged by material at the least to avoid having to manually call out every item with 'dumb' text notes and tags.
It seems like a very strange oversight that there are any objects in Revit can't be tagged, and with Topography that at the very least it can't be tagged by material.