São João Geodetic Marker

São João Geodetic Marker is a point in the Portuguese National Geodetic Network (RGN), the reference network used for mapping, surveying and geographic measurement in Portugal.

Coordinates: 40° 38' 41.6325" N, 07° 31' 19.6413" W (40.64489792, -7.52212258). RGN identification: 1:50,000 sheet 17B, order 2, type BOLEMBREANO.

Altimetry: orthometric altitude at the top 705.45 m; at the base 702.45 m; ellipsoidal altitude at the top 761.37 m.

This record is based on official RGN coordinate data and is useful for understanding the landscape, planning map work or identifying a precise geographic reference point. Local access conditions can vary, so check the terrain before visiting.

RGN source ID: rgn-17b-sao-joao