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: 39° 16' 33.7255" N, 08° 33' 24.7195" W (39.27603486, -8.55686653). RGN identification: 1:50,000 sheet 31A, type BOLEMBREANO S/ DEPÓSITO.

Altimetry: orthometric altitude at the top 41.74 m; at the base 28.79 m; ellipsoidal altitude at the top 95.61 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-31a-sao-joao