Measuring the vineyard

How do you measure a vineyard?  We're looking to get in on a group buy of Bare Hand bird netting, and needed a linear measurement of the vines.
It was surprisingly challenging at first; we chose to measure a certain number of strings, but the string kept getting tangled up.  We got a total number but decided to double-checked our work with two tape measures and a notepad.  Here are the numbers:
row 9 = 98 feet; 19 vines
row 8 = 97 feet; 19 vines
row 7 = 92 feet; 18 vines
row 6 = 86 feet; 17 vines
row 5 = 82 feet; 16 vines
row 4 = 76 feet; 15 vines
row 3 = 66 feet; 13 vines
row 2 = 52 feet; 10 vines
row 1 = 42 feet; 8 vines (well, 7 vines and 1 citrus)

Two things we learned: our vines were planted with 5' vine spacing (5 feet between each vines, that is), and we actually have 135 vines including the scraggly non-producing ones.