orography vs topography

orography

noun
  • the orographic features of a region 

  • the scientific study, or a physical description of mountains 

topography

noun
  • The surveying of the features. 

  • A detailed graphic representation of the surface features of a place or object. 

  • A figurative landscape; a structure of interrelated ideas, etc. 

  • The features themselves; terrain. 

  • A precise description of a place. 

How often have the words orography and topography occurred in a corpus of books? (source: Google Ngram Viewer )