Table 1 Reference epochs and final coordinates of the sites obtained after the joint adjustments of GNSS and topographic observations.

From: The first absolute gravity and height reference network in Sicily

RETE H0

G0 reference sites

Measurement epoch

Geodetic coordinates ITRF2014

GEOID ITALGEO

Orthometric heights

h(m)

LAT

LONG

N(m)

H(m)

CATANIA

2022.419

71.32

37.5137922

15.0819436

41.11

30.21

CENTURIPE

2022.413

713.21

37.6271528

14.7378358

42.09

671.12

MILAZZO

2022.411

44.74

38.2208923

15.2420093

42.75

1.99

NOTO

2022.416

124.78

36.8760409

14.9890523

41.36

83.42

PALERMO

2023.015

87.80

38.1056028

13.3484906

43.52

44.28

  1. To achieve the orthometric heights, useful to refer the gravity measurements to the equipotential surface, it is necessary to know the value of the geoidal undulation in the sites. This value can be retrieved by the regional model of Italian geoid estimated by the International Geoid Service at Politecnico di Milano25.
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