Description of CRS - FR_NTF / FR_LAMB| Attribute | Entry |
|---|
| Country | France |
| Country identifier | FR |
| CRS identifier | FR_NTF / FR_LAMB |
| CRS alias |
|
| CRS valid area | France |
| CRS scope | |
| CRS remarks |
|
| Datum identifier | NTF |
| Datum alias | Nouvelle Triangulation de la France |
| Datum type | geodetic |
| Datum anchor point | France, Paris, Pantheon,
Lat = 48°50'46.52" N,
Lon = 02°20'48.67" E |
| Datum realization epoch | 1898 |
| Datum valid area | France |
| Datum scope |
|
| Datum remarks |
|
| Prime meridian identifier | Paris |
| Prime meridian greenwich longitude | 2°20'14.025" E |
| Prime meridian remarks | 0 grade Paris |
| Ellipsoid identifier | Clarke 1880 IGN |
| Ellipsoid alias | |
| Ellipsoid semi major axis | 6 378 249.2 m |
| Ellipsoid shape | true |
| Ellipsoid inverse flattening | 293.4660213 |
| Ellipsoid remarks | |
| Coordinate system identifier | FR_LAMB |
| Coordinate system type | projected |
| Coordinate system dimension | 2 |
| Coordinate system remarks | |
| Coordinate system axis name | northing |
| Coordinate system axis direction | North |
| Coordinate system axis unit identifier | metre |
| Coordinate system axis name | easting |
| Coordinate system axis direction | East |
| Coordinate system axis unit identifier | metre |
| Operation identifier | FR_LAMB |
| Operation valid area | France, with 5 different zones (I...Nord, II...Centre,
IIE...Etendue, III...Sud, IV...Corse) |
| Operation scope | |
| Operation method name | Lambert Conformal Conic Projection with 1 standard parallel |
| Operation method name alias |
|
| Operation method formula | Lambert Conformal Conic Projection, in Hooijberg,
Practical Geodesy, 1997, pages 133-139 |
| Operation method parameters number | 6 |
| Operation method remarks | description parameters with longitude / latitude values in
FR_Lamb are described in grades (gon)
ellipsoidal coordinates in Datum NTF are all also in
grades and refer to Prime Meridian Paris |
| Operation parameter name | longitude grid origin for all zones |
| Operation parameter value | 0 grade |
| Operation parameter remarks | 0 grade wrt Paris = 2°20'14.025" E wrt Greenwich |
| Operation parameter name | application area of zones |
| Operation parameter value | zone I: 53.5...57.0 grades N
zone II: 50.5...53.5 grades N
zone IIE: 45.9...56.5 grades N
zone III: 47.0...50.5 grades N
zone IV: 45.9...47.8 grades N |
| Operation parameter remarks | zone I: = 48°09'00"...51°18'00" N
zone II: = 45°27'00"...48°09'00" N
zone IIE: = 41°48'36"...50°51'00" N
zone III: = 42°18'00"...45°27'00" N
zone IV: = 41°18'36"...43°01'12" N |
| Operation parameter name | latitude of origin / central parallel of zones |
| Operation parameter value | zone I: 55 grades N
zone II: 52 grades N
zone IIE: 52 grades N
zone III: 49 grades N
zone IV: 46.85 grades N |
| Operation parameter remarks | zone I: = 49°30'00" N
zone II: = 46°48'00" N
zone IIE: = 46°48'00" N
zone III: = 44°06'00" N
zone IV: = 42°09'54" N |
| Operation parameter name | false northing of zones |
| Operation parameter value | zone I: 200 000 m
zone II: 200 000 m
zone IIE: 2 200 000 m
zone III: 200 000 m
zone IV: 185 861.369 m |
| Operation parameter remarks | |
| Operation parameter name | false easting of zones |
| Operation parameter value | zone I: 600 000 m
zone II: 600 000 m
zone IIE: 600 000 m
zone III: 600 000 m
zone IV: 234.358 m |
| Operation parameter remarks | |
| Operation parameter name | scale factor of zones |
| Operation parameter value | zone I: 0.99987734
zone II: 0.99987742
zone IIE: 0.99987742
zone III: 0.99987750
zone IV: 0.99994471 |
| Operation parameter remarks | |