Survey points on aerial imagery

This is a list of near or "on the ground" survey points with known accurate coordinates, which are visible on one or more aerial imagery layer. This list is useful to try to check the real datum used by the aerial imagery.

Australia

Survey marks

(accuracy is usually not very good: http://www.ga.gov.au/ngrs/

GNSS Stations:

http://www.ga.gov.au/ngrs/

Nodes:

Osm node	type	Coordinates + datum	imagery layer	external url	Note
https://www.openstreetmap.org/node/6514708097	GNSS Antenna	149°00'36.54757" E -35°18'58.19901" N GDA94	ACTmapi Imagery 2017, ACTmapi Imagery 2018, LPI Nsw Imagery

Cyprus

Nodes:

https://www.openstreetmap.org/node/6516312263

France

Survey marks:

survey_points with accurate RGF93 coordinates are already in OpenStreetMap. Official website: https://geodesie.ign.fr/fiches/index.php?module=e&action=visugeod

GNSS Stations:

http://rgp.ign.fr/

Nodes:

Osm node	type	Coordinates + datum	imagery layer	external url	Note
https://www.openstreetmap.org/node/670517301	survey point	4° 47' 11.8194" E 45° 39' 30.1359" N ETRS89	Lyon Orthophoto 8cm	http://geodesie.ign.fr/fiches/index.php?module=e&action=fichepdf&source=carte&sit_no=6904601
https://www.openstreetmap.org/node/670518430	survey point	4° 53' 37.9643" E 45° 50' 47.1157" N ETRS89	Lyon Orthophoto 8cm	http://geodesie.ign.fr/fiches/index.php?module=e&action=fichepdf&source=carte&sit_no=6929301
https://www.openstreetmap.org/node/670152116	survey point		Loire-Atlantique - Orthophotos 2016 - 10 cm	http://geodesie.ign.fr/fiches/index.php?module=e&action=fichepdf&source=carte&sit_no=4413601	Pointe Saint-Gildas
https://www.openstreetmap.org/node/670152782	survey point	1° 25' 47.76967" W 46° 58' 08.12041" N ETRS89	Loire-Atlantique - Orthophotos 2016 - 10 cm	http://geodesie.ign.fr/fiches/index.php?module=e&action=fichepdf&source=carte&sit_no=4421606	Vieillevigne
https://www.openstreetmap.org/node/670632793	survey point	2° 28' 19.9911" E 48° 52' 10.0095" N ETRS89	BDOrtho IGN	http://geodesie.ign.fr/fiches/index.php?module=e&action=fichepdf&source=carte&sit_no=9306401	Rosny-sous-Bois (pousser le gamma)
https://www.openstreetmap.org/node/670547097	survey point	2° 26' 07.32390" E 48° 50' 22.10171" N ETRS89	BDOrtho IGN	http://geodesie.ign.fr/fiches/index.php?module=e&action=fichepdf&source=carte&sit_no=7505601	Saint-Mandé