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Topic: Trig point

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	The Dartmoor Trig Points
		The first trig points began appearing in 1935, their purpose was to enable the accurate re-mapping of Great Britain.
		Trig Points are short, square based pyramids, usually white but that depends on weathering and how many animals have used it as a rubbing post.
		In 1992 a scheme was launched to 'adopt a trig pillar' whereby anybody could adopt a trig point as long as they maintained it and had the landowners consent which many walking clubs and individuals did.
	www.legendarydartmoor.co.uk /trig_point.htm (448 words)

	UnitedKingdom Trig Points
		Trig points were a tool to give surveyors a frame of reference for surveying the UK in the days before electronic positioning aids were available (GPS etc).
		Typically, a trig point is a concrete post set on a high point such as a hill with a metal disc inset in the top which you can put your theodolite in.
		There are 6,282 trig points (plus test0001 which you can use for testing) in the database on this web site.
	jeremyp.net /trigpoint/index.php (665 words)

	Trig point - Wikipedia, the free encyclopedia
		Within the trig point, there are concealed mountings for a specialized theodolite, which was temporarily mounted on the trig point while measurements were taken.
		Many of these trig points are now disappearing from the countryside as their function has largely been superseded by aerial photography and digital mapping using lasers and GPS measurements.
		A benchmark on a trig point in North Wales
	en.wikipedia.org /wiki/Trig_point (614 words)

	Trig Function Point Definitions
		In the lower right rectangle of the applet the value for the current trig function at the current angle is calculated using the the relevant quantities from the (x, y) graph.
		This material explains the definitions of the six trigonometric functions in terms of an (x, y) point located on the terminal side of the input angle.
		These trig definitions based upon an (x, y) point on the terminal side of an angle are good for angles of any measurement, positive or negative.
	id.mind.net /~zona/mmts/trigonometryRealms/TrigFuncPointDef/TrigFuncPointDefinitions.html (677 words)

	Flickr: Trig Points
		This group is for photos of Ordnance Survey Trig Points.
		These were constructed across the UK to help provide an unparalleled level of mapping accuracy.
		You can get coordinates from www.streetmap.co.uk, find the trig point, click on it so the arrow points at it as exactly as you can, then search below the map for the convert coordinates link.
	www.flickr.com /groups/trigpoints (200 words)

	trig point on Flickr - Photo Sharing!
		This is definitely a trig point - it has the symbol.
		This is not a 'Trig Point', which was used by the OS to sight other trigs from and hence measure the shape of the land.
		The horizontal line in the mark at one point was very accurately measured as a height above sea level (more technically Newlyn Datum).
	www.flickr.com /photos/justincormack/173562387 (298 words)

	Primary Triangulation Pillars (Site not responding. Last check: 2007-08-11)
		The UK network of concrete pillar triangulation points was built and measured between 1936 and 1962 by the Ordnance Survey, for a project known as the Retriangulation of Great Britain.
		This smaller file lists the pillars in the primary network, whose measurement led to the seamless mapping we enjoy today.
		Further information on trig pillars can be found at http://groups.yahoo.com/group/trigonomy and at www.trigpointinguk.com.
	www.36haroldstreet.freeserve.co.uk /trigpoints.htm (358 words)

	High Resolution Photo: Ordinance survey trig point sand point England uk - Dreamstime
		High Resolution Photo: Ordinance survey trig point sand point England uk - Dreamstime
		Home > Ordinance survey trig point sand point England uk
		Ordinance survey trig point sand point England uk vertical
	www.dreamstime.com /ordinancesurveytrigpointsandpointenglanduk-image205538 (137 words)

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