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Table 5 Comparison cost of each drain assessment method

From: Detecting peatland drains with Object Based Image Analysis and Geoeye-1 imagery

Methods   Amount Rate (€) Total cost (€)
Manual digitisation Labour (hours) 583 17a 9951
Imagery 1 1256 1256
Software cost (per day) 97 2.6b 252
Total    11,459
OBIA Image analysis labour (hours) 120 17a 2047
Imagery 1 1265 1265
Software cost (per day) 20 4.1c 82
Surveyor labour (hours) 16 44 700
Field assistant labour (hours) 16 14 224
Equipment (per job) 19
Lodgings and subsistence 1 125 125
Mileage (km) 576 0.59 340
Car hire 1 50d 50
Total    4852
Field survey Labour surveyor (hours) 124.2 44 5432
Labour field assistant (hours) 124.2 14 1738
Equipment (per job) 144
Lodgings and subsistence 16 125 2000
Mileage (km) 1060 0.59 626
Car hire 1 750e 750
Total    10,690
  1. a €17/h is calculated from the Irish Universities Association research pay scale for a research assistant on point 10 of the salary scale working
  2. b, cSoftware cost per day (assuming a 3 year depreciation and the number of workdays as a ratio of 3 years of workdays as the proportion to cost to the calculation e.g. if used for 15 days, then [15 / (260 × 3)]*2000] = cost of software)
  3. d, eCar hire for 2 and 16 days, respectively
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