page_title: Triangulation station
section_title: South Africa
hierarchical_section_title: Triangulation station / Stations worldwide / South Africa
caption_attribution_description: Afrikaans: Op die kruin van Leeukop, Kaapstad English: The summit of Lion's Head. Español: La cima de la Cabeza de León. Norsk bokmål: På toppen av Lion's Head.
context_page_description: A triangulation station, also known as a trigonometrical point, and sometimes informally as a trig, is a fixed surveying station, used in geodetic surveying and other surveying projects in its vicinity. The nomenclature varies regionally: they are generally known as trigonometrical or triangulation stations in North America, trig points in the United Kingdom, trig pillars in Ireland, trig stations or points in Australia and New Zealand, and trig beacons in South Africa; triangulation pillar is the more formal term for the concrete columns found in the UK, however, the informal term, "trig point", is used more often.
context_section_description: South Africa has a network of approximately 28,000 trig beacons, established by the Chief Directorate: National Geo-spatial Information (historically known as the Trigonometrical Survey). These beacons are typically white-painted concrete pillars supporting black metal plates in a cross shape, installed on mountains, hills or tall buildings.
caption: Trig beacon on the summit of Lion's Head in Cape Town
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