The Collaborative International Dictionary of English v.0.48:

Epipedometry \Ep`i*pe*dom"e*try\, n. [Gr. 'epi`pedos on the
   ground, level ('epi` + pe`don ground) + -metry.] (Geom.)
   The mensuration of figures standing on the same base. [Obs.]
   [1913 Webster]