projected
1995-06-02
true
false
http://www.opengis.net/def/crs/EPSG/0/22391
Carthage / Nord Tunisie
Tunisia - onshore north of 38.5 grads North (34°39'N).
8.18
11.37
34.65
37.4
OGP
2014-05-01
false
false
http://www.opengis.net/def/area/EPSG/0/1619
Tunisia - north of 34°39'N
Large and medium scale topographic mapping and engineering survey.
conversion
1996-09-12
true
false
http://www.opengis.net/def/coordinateOperation/EPSG/0/18181
Nord Tunisie
Tunisia - onshore north of 38.5 grads North (34°39'N).
8.18
11.37
34.65
37.4
OGP
2014-05-01
false
false
http://www.opengis.net/def/area/EPSG/0/1619
Tunisia - north of 34°39'N
Large and medium scale topographic mapping and engineering survey.
ISO 1000.
1995-06-02
false
http://www.opengis.net/def/uom/EPSG/0/9001
metre
Also known as International metre. SI standard unit.
length
0
EPSG guidance note #7-2, http://www.epsg.org
2001-06-05
false
true
For Projected Coordinate System JAD69 / Jamaica National Grid
Parameters:
Ellipsoid: Clarke 1866, a = 6378206.400 m., 1/f = 294.97870
then e = 0.08227185 and e^2 = 0.00676866
Latitude Natural Origin 18°00'00"N = 0.31415927 rad
Longitude Natural Origin 77°00'00"W = -1.34390352 rad
Scale factor at origin 1.000000
False Eastings FE 250000.00 m
False Northings FN 150000.00 m
Forward calculation for:
Latitude: 17°55'55.80"N = 0.31297535 rad
Longitude: 76°56'37.26"W = -1.34292061 rad
first gives
m0 = 0.95136402 t0 = 0.72806411
F = 3.39591092 n = 0.30901699
r = 19643955.26 r0 = 19636447.86
theta = 0.00030374 t = 0.728965259
Then Easting E = 255966.58 m
Northing N = 142493.51 m
Reverse calculation for the same easting and northing first gives
theta' = 0.000303736
t' = 0.728965259
m0 = 0.95136402
r' = 19643955.26
Then Latitude = 17°55'55.800"N
Longitude = 76°56'37.260"W
http://www.opengis.net/def/method/EPSG/0/9801
Lambert Conic Conformal (1SP)
Note: These formulas have been transcribed from EPSG Guidance Note #7-2. Users are encouraged to use that document rather than the text which follows as reference because limitations in the transcription will be avoided.
To derive the projected Easting and Northing coordinates of a point with geographical coordinates (lat,lon) the formulas for the one standard parallel case are:
E = FE + r sin(theta)
N = FN + r0 - r cos(theta)
where
n = sin lat0
r = a F t^n k0 for r0, and r
m = cos(lat)/(1 - e^2 sin^2(lat))^0.5 for m0, lat0, and m2, lat2 where lat1 and lat2 are the latitudes of the standard parallels.
t = tan(pi/4 - lat/2)/[(1 - e sin(lat))/(1 + e sin(lat))]^(e/2) for t0 and t using lat0 and lat respectively.
F = m0/(n t1^n)
theta = n(lon - lon0)
The reverse formulas to derive the latitude and longitude of a point from its Easting and Northing values are:
lat = pi/2 - 2arctan{t'[(1 - esin(lat))/(1 + esin(lat))]^(e/2)}
lon = theta'/n +lon0
where
theta' = arctan[(E - FE)/{r0 -(N - FN)}]
r' = +/-[(E - FE)^2 + {r0 - (N - FN)}^2]^0.5 taking the sign of n
t' = (r'/(a k0 F))^(1/n)
and n, F, and rF are derived as for the forward calculation.
2
2
40
EPSG guidance note number 7.
1999-09-09
false
The latitude of the point from which the values of both the geographical coordinates on the ellipsoid and the grid coordinates on the projection are deemed to increment or decrement for computational purposes. Alternatively it may be considered as the latitude of the point which in the absence of application of false coordinates has grid coordinates of (0,0).
http://www.opengis.net/def/parameter/EPSG/0/8801
Latitude of natural origin
11
Abbeviated as "CM".
Abbreviation for "Central Meridian".
EPSG guidance note number 7.
2002-06-22
false
The longitude of the point from which the values of both the geographical coordinates on the ellipsoid and the grid coordinates on the projection are deemed to increment or decrement for computational purposes. Alternatively it may be considered as the longitude of the point which in the absence of application of false coordinates has grid coordinates of (0,0). Sometimes known as "central meridian (CM)".
http://www.opengis.net/def/parameter/EPSG/0/8802
Longitude of natural origin
0.999625544
EPSG guidance note number 7.
1999-09-09
false
The factor by which the map grid is reduced or enlarged during the projection process, defined by its value at the natural origin.
http://www.opengis.net/def/parameter/EPSG/0/8805
Scale factor at natural origin
500000
This alias applies only in the case of projection methods which have an axis positive west, e.g. Transverse Mercator (South Orientated).
EPSG guidance note number 7.
2002-07-31
false
Since the natural origin may be at or near the centre of the projection and under normal coordinate circumstances would thus give rise to negative coordinates over parts of the mapped area, this origin is usually given false coordinates which are large enough to avoid this inconvenience. The False Easting, FE, is the value assigned to the abscissa (east or west) axis of the projection grid at the natural origin.
http://www.opengis.net/def/parameter/EPSG/0/8806
False easting
300000
This alias applies only in the case of projection methods which have an axis positive south, e.g. Transverse Mercator (South Orientated).
EPSG guidance note number 7.
2002-07-31
false
Since the natural origin may be at or near the centre of the projection and under normal coordinate circumstances would thus give rise to negative coordinates over parts of the mapped area, this origin is usually given false coordinates which are large enough to avoid this inconvenience. The False Northing, FN, is the value assigned to the ordinate (north or south) axis of the projection grid at the natural origin.
http://www.opengis.net/def/parameter/EPSG/0/8807
False northing
geographic 2D
2004-01-06
true
false
http://www.opengis.net/def/crs/EPSG/0/4223
Carthage
Tunisia - onshore and offshore.
7.49
13.67
30.23
38.41
ISO 3166 Maintenance Agency. ftp://ftp.fu-berlin.de/pub/doc/iso
2014-05-01
false
false
http://www.opengis.net/def/area/EPSG/0/1236
Tunisia
TN
TUN
788
Geodetic survey.
ellipsoidal
OGP
2008-06-23
false
http://www.opengis.net/def/cs/EPSG/0/6422
Ellipsoidal 2D CS. Axes: latitude, longitude. Orientations: north, east. UoM: degree
Coordinates referenced to this CS are in degrees. Any degree representation (e.g. DMSH, decimal, etc.) may be used but that used must be declared for the user by the supplier of data. Used in geographic 2D coordinate reference systems.
http://www.opengis.net/def/axis/EPSG/0/106
Lat
north
http://www.opengis.net/def/axis/EPSG/0/107
Long
east
geodetic
2008-06-24
false
http://www.opengis.net/def/datum/EPSG/0/6223
Carthage
Fundamental point astronomic coordinates determined in 1878.
Topographic mapping.
Fundamental point: Carthage. Latitude: 40.9464506g = 36°51'06.50"N, longitude: 8.8724368g E of Paris = 10°19'20.72"E (of Greenwich).
1925-01-01
Cartesian
OGP
2001-04-29
false
http://www.opengis.net/def/cs/EPSG/0/4499
Cartesian 2D CS. Axes: easting, northing (X,Y). Orientations: east, north. UoM: m.
Used in projected and engineering coordinate reference systems.
http://www.opengis.net/def/axis/EPSG/0/41
X
east
http://www.opengis.net/def/axis/EPSG/0/42
Y
north