Description of CRS - GB_OSGB36 / NATIONALGRID| Attribute | Entry |
|---|
| Country | Great Britain |
| Country identifier | GB |
| CRS identifier | GB_OSGB36 / NATIONALGRID |
| CRS alias |
|
| CRS valid area | Great Britain (not offshore) |
| CRS scope | |
| CRS remarks |
|
| Datum identifier | OSGB36 |
| Datum alias |
|
| Datum type | geodetic |
| Datum anchor point | no initial point, defined by the position of 11 stations
from the "Principal Triangulation" (1783-1853) |
| Datum realization epoch | 1936 |
| Datum valid area | Great Britain (not offshore) |
| Datum scope |
|
| Datum remarks |
|
| Prime meridian identifier | Greenwich |
| Prime meridian greenwich longitude | 0° |
| Prime meridian remarks | |
| Ellipsoid identifier | Airy 1830 |
| Ellipsoid alias | |
| Ellipsoid semi major axis | 6 377 563.3960 m |
| Ellipsoid shape | true |
| Ellipsoid inverse flattening | 299.324964594 |
| Ellipsoid remarks | |
| Coordinate system identifier | NATIONALGRID |
| Coordinate system type | projected |
| Coordinate system dimension | 2 |
| Coordinate system remarks | |
| Coordinate system axis name | X / northing |
| Coordinate system axis direction | North |
| Coordinate system axis unit identifier | metre |
| Coordinate system axis name | Y / easting |
| Coordinate system axis direction | East |
| Coordinate system axis unit identifier | metre |
| Operation identifier | NATIONALGRID |
| Operation valid area | Great Britain (not offshore) |
| Operation scope | |
| Operation method name | Transverse Mercator Projection |
| Operation method name alias | Transverse Mercator Projection |
| Operation method formula | Transverse Mercator Mapping Equations, in Hooijberg,
Practical Geodesy, 1997, pages 81-84 |
| Operation method parameters number | 5 |
| Operation method remarks |
|
| Operation parameter name | latitude of origin |
| Operation parameter value | 49° N |
| Operation parameter remarks | |
| Operation parameter name | longitude of origin |
| Operation parameter value | 2° W |
| Operation parameter remarks | |
| Operation parameter name | false northing |
| Operation parameter value | -100 000 m |
| Operation parameter remarks | or origin northing |
| Operation parameter name | false easting |
| Operation parameter value | 400 000 m |
| Operation parameter remarks | or origin easting |
| Operation parameter name | scale factor at central meridian |
| Operation parameter value | 0.9996012717 |
| Operation parameter remarks | |