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Table 2 Actual costs of traditional ground-truthing compared with estimated costs of modified ground-truthing

From: Modified ground-truthing: an accurate and cost-effective food environment validation method for town and rural areas

  Traditional ground-truthing (actual) Modified ground-truthing (estimated)b Savingsb
  Site   Site    
  A B C Total A B C Total Amount %
Mileage           
 Miles of road within network 80 236 248 564 10 32 25 66 498 miles 88 %
 Miles driven for ground-truthing 100 262 356 718 12 40 31 83 635 miles 88 %
 Ground-truthing mileage costsa $57 $148 $201 406 $7 $23 $18 47 $359 88 %
 Miles driven to/from sites 124 272 396 792 124 136 132 392 400 miles 51 %
 Total miles driven 224 534 752 1510 136 168 157 460 1050 miles 70 %
 Total mileage costsa $127 $302 $425 853 $77 $95 $89 260 $593 70 %
Time/staffing           
 Full day trips needed 1 2 3 6 1 1 1 3 3 days 50 %
 Time spent ground-truthing (hr:min) 4:30 13:14 15:39 33:38 -- -- -- -- -- --
 Average mph during ground truthing 22.2 19.8 22.7 21.4 -- -- -- -- -- --
 Total hours of data collectionc 15 40 59 114 -- -- -- -- -- --
  1. aAssuming a mileage rate of $0.565
  2. bNot all time/staffing and savings metrics could be estimated. Miles per hour within central commercial districts is likely lower than the miles per hour in all town/rural areas
  3. cHours totaled for two data collectors