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(show all questions)
(show all questions)
- I don't understand Grid References - are there any sites to help me? Close
- Here's a quick link to the Ordnance Survey's beginner's guide to grid references: https://www.ordnancesurvey.co.uk/getoutside/guides/beginners-guide-to-grid-references/
Grid references locate places on the map. They consist of one (Ireland) or two (Great Britain) letters followed by an even number of digits. The letters define a (100x100)km^2 square (a 'myriad' in Geograph-speak) and are best looked up on an overview map. The numbers locate the position within that square. To find a location, split the block of numbers in two. The first block is the easting, i.e. the distance from the western edge of the myriad. The second is the northing - the distance from its southern edge.
Grid references always specify square areas, not points. The more digits there are, the smaller is the square referred to, and the higher is the precision of the grid reference. For each pair of digits, the precision increases by a factor of ten: SN58 defines a square of (10x10)km^2, 50km to the east and 80km to the north of the origin of myriad SN. SN5881 is a (1x1)km^2 square 58km east and 81km north of that origin. SN 58272 81324 is a (1x1)m^2 area. When stating a grid reference, the precision given should be in line with the accuracy of the position (how well do we actually know where we are?) and with the size of the object (a building doesn't fit on a 1m^2 footprint).
The system Geograph still uses in Ireland works in exactly the same way, although the Ordnance Surveys of Ireland and of Northern Ireland have recently introduced a different system for their maps. This article http://www.geograph.org.uk/article/Locating-photos---Republic-of-Ireland explains the differences.· More information on this topic... · Edit this answer (Open for editing by anyone) · Provide an alternative answer! - how can I tell which of my submissions gained a Tpoint Close
- Shortly after moderation, but NOT for Supplementals, your photo will clearly state that it has earned a T point.· contributed by Flying Stag, Jun 2012 · Edit this answer (Open for editing by anyone) · Provide an alternative answer!
- Does a 'cross-grid' qualify for a T-point? I have noticed at least one cross-grid being awarded. Close
- No, T-points are only awarded to Geographs. However, if an image which qualified for a T-point is later reclassified as 'cross grid' (e.g. photographer position added or moved) it is likely to retain its T-point for some time. Up-dating of T-points (an infrequent process) is long over-due.· More information on this topic... · contributed by Penny Mayes, Feb 2019 · Edit this answer (Open for editing by anyone) · Provide an alternative answer!
- Why do only some photos get a Geograph point? Close
- In general you will only get a point the first time you visit a grid square, and your photo is moderated as a "geograph". You may also get extra points if you are one of the first 4 people to visit the square. Subsequent photos in the same square will not get you any points, photos classified as "supplemental" will not get you any points.
(From 11 May 2016 the Supplemental Classification is replaced by Image Type Tags:
see http://www.geograph.org.uk/article/Image-Type-Tags ).
Tpoints work slightly differently to the above: you get a Tpoint if you submit a geograph which has a time difference of 5 years (before or after) compared to other geographs in the grid square: So with Tpoints it may be possible to get subsequent points for the same grid square.· More information on this topic... · contributed by Roger Jones, Jun 2011 · Edit this answer (Open for editing by anyone) · Provide an alternative answer!
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