“…As an example, the Phenocam network (Richardson et al, 2007) monitors hundreds of sites (mainly in North America); but there are a few more networks fully operational in Europe, Asia and Australia (Moore et al, 2016) and Brazil (Alberton et al, 2017;Alberton et al, 2019). Besides this, studies have being investigating the potential of using traffic and security cameras as phenocams (Morris et al, 2013;Bothmann et al, 2017), which could increase dramatically the number of sampling locations and diminish installation costs. Furthermore, additional instrumentation is usually available (e.g., meteorological stations), which can supply with extra ground-truth data (Moore et al, 2016), which in turn could: 1) feed models such as the Quadratic, which requires the calculation of the accumulated growing degree-days (White et al, 2009); and 2) enable comparisons with meteorological data (Bradley et al, 2010).…”