Table 1.

Stations providing GHI ground observations.

Site	Network	Location	Source of data	Time period	Native temporal resolution (min)	Distance to next airport/METAR observation (km)
Cairo	enerMENA	30.04 ˚N, 31.01˚E	http://tds.webservice-energy.org/	2015–2019	1	39
Gurgaon	BSRN	28.42 ˚N, 77.16 ˚E	http://tds.webservice-energy.org/	2018–2019	1	12
Da Nang	ESMAP	16.01 ˚N, 108.19 ˚E	http://tds.webservice-energy.org/	2017–2019	1	8
Xianghe	BSRN	39.75 ˚N, 116.96 ˚E	ftp://ftp.bsrn.awi.de/	2010–2015	1	71
Chiba	SKYNET	35.63 ˚N, 140.10 ˚E	http://tds.webservice-energy.org/	2015–2017	1	20
Adrar	enerMENA	27.88 ˚N, 0.27 ˚W	http://tds.webservice-energy.org/	2015–2016	1	9
Ghardaia	enerMENA	32.39 ˚N, 3.78 ˚E	http://tds.webservice-energy.org/	2015–2018	1	2
Pretoria	SAURAN	25.75 ˚S, 28.23 ˚E	http://tds.webservice-energy.org/	2015–2024	1	9