“…The importance of ecosystems to human welfare has numerous dimensions (ecological, socio-cultural and economic), however, expressing value in monetary terms has proven useful in helping to consistently frame tradeoffs between options that have to address multiple assessment criteria (Costanza et al, 2017;Díaz et al, 2018;Georgiou, Whittington, Pearce, & Moran, 1997). Within this context, ecosystem service valuation (ESV) has three broad purposes (Laurans, Rankovic, Billé, Pirard, & Mermet, 2013): to be (i) informative, such as raising awareness of the value of biodiversity (Costanza et al, 1997(Costanza et al, , 2017Kumar, 2010) and providing data for ecosystem accounting for integration into green GDP (Andrade & Garcia, 2015; Secretariat of the Convention on Biological Diversity, 2010) and for full-cost corporate accounting (Capitals Coalition, 2016;Epstein et al, 2011); (ii) technical, such as setting compensation rates for loss of environmental amenity (Aultman et al, 1993); and (iii) decisive, such as informing policy-making in land-use using benefit cost analysis (Barbier, 2012;Gashaw et al, 2018;Heal et al, 2005;Sinner, Bell, Phillips, Yap, & Batstone, 2016;Sumarga & Hein, 2016). Unlike normal market goods, most ESs do not lend themselves to "spatial arbitrage", to take advantage of higher willingness to pay elsewhere (the exception to this rule is carbon sequestration services, which provide benefits at a global scale as a public good, or a private good if traded as a permit) (Boyd & Banzhaf, 2007, p. 622;UN Statistical Division, 2014), therefore many ESV applications involve integrating a spatial element, enabling analysts to estimate the ES benefits for a spatially-defined unit.…”