projected
OGP
2013-06-12
true
false
http://www.opengis.net/def/crs/EPSG/0/22300
Carthage (Paris) / Tunisia Mining Grid
CAUTION: Carthage datum did not exist when the 1953 decree was issued and an inference is that grid should be applied to the Voirol 1875 geogCRS. Common practice assumes that the current Tunisian geodetic datum of Carthage applies.
Tunisia - onshore.
7.49
11.59
30.23
37.4
OGP
2014-05-01
false
false
http://www.opengis.net/def/area/EPSG/0/1618
Tunisia - onshore
Minerals licence definition.
conversion
Mining decree of 1st January 1953.
2013-06-12
true
false
http://www.opengis.net/def/coordinateOperation/EPSG/0/19937
Tunisia Mining Grid
The origin of the grid is at 38.81973gN, 7.83445gE of Paris, near Djebel Kebar, at which the grid reference is 270582.
Tunisia - onshore.
7.49
11.59
30.23
37.4
OGP
2014-05-01
false
false
http://www.opengis.net/def/area/EPSG/0/1618
Tunisia - onshore
Minerals licencing
EPSG guidance note #7-2, http://www.epsg.org
2013-06-12
true
false
true
Defining parameters are:
LatO = 36.5964gN
LonO = 7.83445gE of Paris
Ef = 270 km
Nf = 360 km
For grid location 302598, first derive the easting (302 km) and northing (598 km) from the grid reference. Then:
Lat = 36.5964 + [(598 - 360) * A]. As N > 360, A = 0.010015.
Lat = 38.97997 grads N = 35.08197 degrees N.
Lon = 7.83445 + [(302 - 270) * 0.012185
= 8.22437 grads east of Paris = 9.73916 degrees east of Greenwich.
http://www.opengis.net/def/method/EPSG/0/9816
Tunisia Mining Grid
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.
This grid is used as the basis for mineral leasing in Tunsia. Lease areas are approximately 2 x 2 km or 400 hectares. The southwest corner of these blocks is defined through a six figure grid reference where the first three digits are an easting in kilometres and the last three digits are a northing. The origin of the grid is Djebel Kebar at 38.81973gN, 7.83445gE of Paris at which the grid reference is 270582. The latitudes and longitudes for block corners at 2 km intervals are tabulated in a mining decree dated 1st January 1953. From this tabulation in which geographical coordinates are given to 5 decimal places it can be seen that:
a) the minimum easting is 94 km, on which the longitude is 5.68989 grads east of Paris.
b) the maximum easting is 490 km, on which the longitude is 10.51515 grads east of Paris.
c) each 2 km grid easting interval equals 0.02437 grads.
d) the minimum northing is 40 km, on which the latitude is 33.39 grads.
e) the maximum northing is 860 km, on which the latitude is 41.6039 grads.
f) between 40 km N and 360 km N, each 2 km grid northing interval equals 0.02004 grads.
g) between 360 km N and 860 km N, each 2 km grid northing interval equals 0.02003 grads.
From the above the latitude of N=360 can be determined to be 36.5964gN.
Formulae are:
Grads from Paris
Lat = LatO + [(N - Nf) * A]
where Lat and LatO are in grads, N and Nf are in kilometres and A = 0.010015 if N > Nf, else A = 0.01002.
Lon = LonO + [(E - Ef) * 0.012185]
where Lon and LonO are in in grads relative to the Paris meridian and E and Ef are in kilometres.
The reverse formulae are:
E = Ef + [(Lon - LonO) / 0.012185]
N = Nf + [(Lat - LatO) / A]
where A = 0.010015 if Lat>LatO else A = 0.01002.
Degrees from Greenwich.
Modern practice in Tunisia is to quote latitude and longitude in degrees with longitudes referenced to the Greenwich meridian. The formulae required in addition to the above are:
Lat (degrees) = (Latg * 0.9) where Latg is in grads.
LonGreenwich (degrees) = [(LonParis + 2.5969213) * 0.9] where LonParis is in grads.
Lat (grads) = (Latd / 0.9) where Latd is in decimal degrees.
LonParis (grads) = [(LonGreenwich / 0.9) - 2.5969213)] where LonGreenwich is in decimal degrees.
36.5964
EPSG guidance note number 7.
1999-09-09
false
The latitude of the point which is not the natural origin and at which grid coordinate values false easting and false northing are defined.
http://www.opengis.net/def/parameter/EPSG/0/8821
Latitude of false origin
7.83445
EPSG guidance note number 7.
1999-09-09
false
The longitude of the point which is not the natural origin and at which grid coordinate values false easting and false northing are defined.
http://www.opengis.net/def/parameter/EPSG/0/8822
Longitude of false origin
270
EPSG guidance note number 7.
1999-09-09
false
The easting value assigned to the false origin.
http://www.opengis.net/def/parameter/EPSG/0/8826
Easting at false origin
360
EPSG guidance note number 7.
1999-09-09
false
The northing value assigned to the false origin.
http://www.opengis.net/def/parameter/EPSG/0/8827
Northing at false origin
geographic 2D
2004-01-06
true
false
http://www.opengis.net/def/crs/EPSG/0/4816
Carthage (Paris)
Replaced by Greenwich-based Carthage geogCRS.
Tunisia - onshore.
7.49
11.59
30.23
37.4
OGP
2014-05-01
false
false
http://www.opengis.net/def/area/EPSG/0/1618
Tunisia - onshore
Geodetic survey.
ellipsoidal
OGP
2002-11-18
false
http://www.opengis.net/def/cs/EPSG/0/6403
Ellipsoidal 2D CS. Axes: latitude, longitude. Orientations: north, east. UoM: grads.
Used in geographic 2D coordinate reference systems.
http://www.opengis.net/def/axis/EPSG/0/58
Lat
north
http://www.opengis.net/def/axis/EPSG/0/59
Long
east
geodetic
2004-01-15
false
http://www.opengis.net/def/datum/EPSG/0/6816
Carthage (Paris)
Fundamental point astronomic coordinates determined in 1878.
Topographic mapping.
Fundamental point: Carthage. Latitude: 40.9464506g N, longitude: 8.8724368g E (of Paris).
1925-01-01
Cartesian
OGP
2001-04-29
false
http://www.opengis.net/def/cs/EPSG/0/4406
Cartesian 2D CS. Axes: easting, northing (E,N). Orientations: east, north. UoM: km.
Used in projected and engineering coordinate reference systems.
http://www.opengis.net/def/axis/EPSG/0/13
X
east
http://www.opengis.net/def/axis/EPSG/0/14
Y
north