Horizontal and vertical accuracy of Google Earth®: comment on 'Positional accuracy of the Google Earth terrain model derived from stratigraphic unconformities in the Big Bend region, Texas, USA' by SC Benker, RP Langford and TL Pavlis

Comment on Positional accuracy of the Google Earth terrain model derived from stratigraphic unconformities in the Big Bend region, Texas, USA' by S.C. Benker, R.P. Langford and T.L. Pavlis (Geocarto Int. 26:291-303, doi: 10.1080/10106049.2011.568125).