Geograph Knowledgebase / FAQ


I don't understand Grid References - are there any sites to help me?
Here's a quick link to the Ordnance Survey's beginner's guide to grid references: link

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 link explains the differences.

Photo Contributors

How do I get a list of my photos as a CSV?
On the bottom of your profile page, look for "Download: CSV , XML for Excel 2003 of all images".
This has links to download as Comma Separate Values (CSV) or Excel XML format.

These can be opened in spreadsheet software, eg LibreOffice or Micrsoft Excel.

The URL for these downloads looks like this:
For CSV: link
For Excel: link

The parameters specify what is included. The contributor is u=XXXX, where XXXX is the user ID. If you use a link from your own profile, it will include your own ID.

Other options:
&supp=1 - include photos classed as supplemental
&taken=1 - include taken date
&submitted=1 - include submitted date
&hits=1 - include hit count
&tags=1 - include tags, in a list separated by question marks
&desc=1 - include description
&class=1 - include classification (geograph or supplemental)
&level=1 - include geograph points, eg 1st, 2nd, 3rd
&ll=1 - include latitude and longitude (in separate columns)
&en=1 - include numerical grid reference, in easting and northing, plus figures for precision
&ppos=1 - include photographer position, easting and northing

For more details, see the API help: link

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