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

Table 5 Comparison cost of each drain assessment method

Methods		Amount	Rate (€)	Total cost (€)
Manual digitisation	Labour (hours)	583	17^a	9951
	Imagery	1	1256	1256
	Software cost (per day)	97	2.6^b	252
	Total			11,459
OBIA	Image analysis labour (hours)	120	17^a	2047
	Imagery	1	1265	1265
	Software cost (per day)	20	4.1^c	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	50^d	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	750^e	750
	Total			10,690

^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
^{b, c}Software 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)
^{d, e}Car hire for 2 and 16 days, respectively

ISSN: 1750-0680