topography vs viewport

topography

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

  • The surveying of the features. 

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

  • The features themselves; terrain. 

  • A precise description of a place. 

viewport

noun
  • A typically rectangular region representing the range or area currently visible (within a window, screen, etc.). 

  • A viewing window. 

verb
  • To clip (an image or region) so that it fits in a viewport. 

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