Table 2 List of the selected ground observatories used for validation tests, listed in alphabetic order

Abisko

ABK

\(21.64^{\circ }\)

\(18.82^{\circ }\)

Ascension Island

ASC

\(97.95^{\circ }\)

\(345.62^{\circ }\)

Alice Springs

ASP

\(113.77^{\circ }\)

\(133.88^{\circ }\)

Boulder

BOU

\(49.87^{\circ }\)

\(254.77^{\circ }\)

Barrow

BRW

\(18.68^{\circ }\)

\(203.38^{\circ }\)

Chambon la Forêt

CLF

\(41.98^{\circ }\)

\(2.27^{\circ }\)

College

CMO

\(25.13^{\circ }\)

\(212.14^{\circ }\)

Canberra

CNB

\(125.32^{\circ }\)

\(149.36^{\circ }\)

Gan

GAN

\(89.30^{\circ }\)

\(73.15^{\circ }\)

Qeqertarsuaq (Godhavn)

GDH

\(20.748^{\circ }\)

\(306.467^{\circ }\)

Guam

GUA

\(76.41^{\circ }\)

\(144.87^{\circ }\)

Hermanus

HER

\(124.43^{\circ }\)

\(19.23^{\circ }\)

Honolulu

HON

\(68.68^{\circ }\)

\(202.0^{\circ }\)

Hornsund

HRN

\(12.99^{\circ }\)

\(15.54^{\circ }\)

Huancayo

HUA

\(102.05^{\circ }\)

\(284.67^{\circ }\)

Kakioka

KAK

\(53.77^{\circ }\)

\(140.18^{\circ }\)

Kourou

KOU

\(84.79^{\circ }\)

\(307.27^{\circ }\)

Learmonth

LRM

\(112.22^{\circ }\)

\(114.1^{\circ }\)

Mawson

MAW

\(157.60^{\circ }\)

\(62.88^{\circ }\)

Mbour

MBO

\(75.62^{\circ }\)

\(343.03^{\circ }\)

Macquarie Island

MCQ

\(144.5^{\circ }\)

\(158.95^{\circ }\)

Narsarsuaq

NAQ

\(28.84^{\circ }\)

\(314.56^{\circ }\)

Niemegk

NGK

\(37.93^{\circ }\)

\(12.68^{\circ }\)

Novosibirsk

NSV

\(35.15^{\circ }\)

\(83.23^{\circ }\)

Port Stanley

PST

\(141.70^{\circ }\)

\(302.11^{\circ }\)

Resolute Bay

RES

\(15.31^{\circ }\)

\(265.10^{\circ }\)

Shumagin

SHU

\(34.65^{\circ }\)

\(199.54^{\circ }\)

Tristan da Cunha

TDC

\(127.07^{\circ }\)

\(347.68^{\circ }\)