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Introduction

A map datum is a reference from which measurements are made. In geodesy, a geodetic or map datum is a set of reference points on the earth's surface against which position measurements are made, and (often) an associated model of the shape of the earth (reference ellipsoid) to define a geographic coordinate system. Some examples of geodetic datums are: NAD27, NAD83, ED50 etc...

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Parameters

An map datum can be defined in the Eye4Software Coordinate Calculator or Eye4Software GPS Toolkit using 7 parameters, also called Helmert-7 parameters:

• Scale Factor;
• Translation X ( tX );
• Translation Y ( tY );
• Translation Z ( tZ );
• Rotation X ( rX );
• Rotation Y ( rY );
• Rotation Z ( rZ );

Also an ellipsoid has to be specified when a map datum is defined.

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List of map datums used around the world

EPSG ID#	Map Datum Name
4143	Abidjan 1987
4168	Accra
4201	Adindan
4205	Afgooye
4206	Agadez
4202	AGD66
4203	AGD84
4204	Ain el Abd
4191	Albanian 1987
4169	American Samoa 1962
4289	Amersfoort
4196	Ammassalik 1958
4600	Anguilla 1957
4601	Antigua 1943
4208	Aratu
4209	Arc 1950
4210	Arc 1960
4712	Ascension Island 1958
4901	ATF (Paris)
4122	ATS77
4176	Australian Antarctic
4713	Ayabelle Lighthouse
4183	Azores Central 1948
4665	Azores Central 1995
4182	Azores Occidental 1939
4184	Azores Oriental 1940
4664	Azores Oriental 1995
4212	Barbados 1938
4211	Batavia
4813	Batavia (Jakarta)
4762	BDA2000
4213	Beduaram
4214	Beijing 1954
4215	Belge 1950
4809	Belge 1950 (Brussels)
4313	Belge 1972
4714	Bellevue
4216	Bermuda 1957
4801	Bern 1898 (Bern)
4306	Bern 1938
4165	Bissau
4218	Bogota 1975
4802	Bogota 1975 (Bogota)
4219	Bukit Rimpah
4475	Cadastre 1997
4220	Camacupa
4715	Camp Area Astro
4221	Campo Inchauspe
4222	Cape
4717	Cape Canaveral
4223	Carthage
4816	Carthage (Paris)
4149	CH1903
4150	CH1903+
4672	Chatham Islands 1971
4673	Chatham Islands 1979
4490	China Geodetic Coordinate System 2000
4160	Chos Malal 1914
4151	CHTRF95
4224	Chua
4708	Cocos Islands 1965
4632	Combani 1950
4315	Conakry 1905
4225	Corrego Alegre
4226	Cote d'Ivoire
4623	CSG67
4155	Dabola 1981
4274	Datum 73
4316	Dealul Piscului 1930
4317	Dealul Piscului 1970
4736	Deception Island
4227	Deir ez Zor
4755	DGN95
4314	DHDN
4724	Diego Garcia 1969
4602	Dominica 1945
4228	Douala
4192	Douala 1948
4719	Easter Island 1967
4230	ED50
4154	ED50(ED77)
4668	ED79
4231	ED87
4229	Egypt 1907
4199	Egypt 1930
4706	Egypt Gulf of Suez S-650 TL
4159	ELD79
4133	EST92
4180	EST97
4258	ETRS89
4232	Fahud
4688	Fatu Iva 72
4741	FD54
4132	FD58
4721	Fiji 1956
4720	Fiji 1986
4753	fk89
4621	Fort Marigot
4684	Gan 1970
4685	Gandajika
4233	Gandajika 1970
4197	Garoua
4234	Garoua
4283	GDA94
4742	GDM2000
4121	GGRS87
4747	GR96
4723	Grand Cayman 1959
4646	Grand Comoros
4120	Greek
4815	Greek (Athens)
4603	Grenada 1953
4622	Guadeloupe 1948
4675	Guam 1963
4682	Gulshan 303
4235	Guyane Francaise
4147	Hanoi 1972
4148	Hartebeesthoek94
3819	HD1909
4237	HD72
4660	Helle 1954
4255	Herat North
4254	Hito XVIII 1963
4658	Hjorsey 1955
4738	Hong Kong 1963
4739	Hong Kong 1963(67)
4611	Hong Kong 1980
4761	HTRS96
4236	Hu Tzu Shan 1950
4238	ID74
4697	IGC 1962 6th Parallel South
4701	IGCB 1955
4670	IGM95
4698	IGN 1962 Kerguelen
4700	IGN Astro 1960
4641	IGN53 Mare
4633	IGN56 Lifou
4689	IGN63 Hiva Oa
4634	IGN72 Grand Terre
4662	IGN72 Grande Terre
4630	IGN72 Nuku Hiva
3889	IGRS
4667	IKBD-92
4239	Indian 1954
4131	Indian 1960
4240	Indian 1975
4173	IRENET95
4659	ISN93
4141	Israel
4709	Iwo Jima 1945
4758	JAD2001
4242	JAD69
4241	Jamaica 1875
4612	JGD2000
4725	Johnston Island 1961
4679	Jouik 1961
4631	K0 1949
4243	Kalianpur 1880
4144	Kalianpur 1937
4145	Kalianpur 1962
4146	Kalianpur 1975
4244	Kandawala
4743	Karbala 1979
4696	Kasai 1953
4695	Katanga 1955
4751	Kertau (RSO)
4245	Kertau 1968
4123	KKJ
4246	KOC
4737	Korea 2000
4162	Korean 1985
4166	Korean 1995
4198	Kousseri
4319	KUDAMS
4735	Kusaie 1951
4247	La Canoa
4249	Lake
4677	Lao 1993
4678	Lao 1997
4699	Le Pouce 1934
4250	Leigon
4754	LGD2006
4251	Liberia 1964
4207	Lisbon
4803	Lisbon (Lisbon)
4666	Lisbon 1890
4904	Lisbon 1890 (Lisbon)
4726	Little Cayman 1961
4661	LKS92
4669	LKS94
4126	LKS94 (ETRS89)
4142	Locodjo 1965
4288	Loma Quintana
4252	Lome
4181	Luxembourg 1930
4253	Luzon 1911
4266	M'poraloko
4185	Madeira 1936
4903	Madrid 1870 (Madrid)
4128	Madzansua
4686	MAGNA-SIRGAS
4256	Mahe 1971
4257	Makassar
4804	Makassar (Jakarta)
4259	Malongo 1987
4260	Manoca
4193	Manoca 1962
4711	Marcus Island 1952
4732	Marshall Islands 1960
4625	Martinique 1938
4262	Massawa
4692	Maupiti 83
4681	Mauritania 1999
4702	Mauritania 1999
4261	Merchich
4483	Mexican Datum of 1993
4312	MGI
4805	MGI (Ferro)
3906	MGI 1901
4264	Mhast
4705	Mhast (offshore)
4704	Mhast (onshore)
4703	Mhast 1951
4727	Midway 1961
4263	Minna
4023	MOLDREF99
4265	Monte Mario
4806	Monte Mario (Rome)
4604	Montserrat 1958
4691	Moorea 87
4639	MOP78
4157	Mount Dillon
4130	Moznet
4267	NAD27
4268	NAD27 Michigan
4608	NAD27(76)
4609	NAD27(CGQ77)
4269	NAD83
4617	NAD83(CSRS)
4140	NAD83(CSRS98)
4152	NAD83(HARN)
4759	NAD83(NSRS2007)
4744	Nahrwan 1934
4270	Nahrwan 1967
4693	Nakhl-e Ghanem
4158	Naparima 1955
4271	Naparima 1972
4902	NDG (Paris)
4644	NEA74 Noumea
4555	New Beijing
4318	NGN
4273	NGO 1948
4817	NGO 1948 (Oslo)
4307	Nord Sahara 1959
4819	Nord Sahara 1959 (Paris)
4680	Nouakchott 1965
4276	NSWC 9Z-2
4275	NTF
4807	NTF (Paris)
4167	NZGD2000
4272	NZGD49
4129	Observatario
4135	Old Hawaiian
4279	OS(SN)80
4277	OSGB 1936
4278	OSGB70
4188	OSNI 1952
4280	Padang
4808	Padang (Jakarta)
4281	Palestine 1923
4161	Pampa del Castillo
4746	PD/83
4637	Perroud 1950
4636	Petrels 1972
4716	Phoenix Islands 1966
4728	Pico de las Nieves 1984
4729	Pitcairn 1967
4763	Pitcairn 2006
4620	Point 58
4282	Pointe Noire
4055	Popular Visualisation CRS
4615	Porto Santo
4663	Porto Santo 1995
4172	POSGAR
4694	POSGAR 94
4190	POSGAR 98
4824	Principe
4683	PRS92
4248	PSAD56
4134	PSD93
4139	Puerto Rico
4284	Pulkovo 1942
4179	Pulkovo 1942(58)
4178	Pulkovo 1942(83)
4200	Pulkovo 1995
4740	PZ-90
4286	Qatar 1948
4285	Qatar 1974
4614	QND95
4287	Qornoq
4194	Qornoq 1927
4153	Rassadiran
4745	RD/83
4081	REGCAN95
4189	REGVEN
4626	Reunion 1947
4657	Reykjavik 1900
4171	RGF93
4624	RGFG95
4470	RGM04
4645	RGNC 1991
4749	RGNC91-93
4687	RGPF
4627	RGR92
4046	RGRDC 2005
4463	RGSPM06
4558	RRAF 1991
4640	RRAF 1991
4764	RSRGD2000
4308	RT38
4814	RT38 (Stockholm)
4124	RT90
4156	S-JTSK
4818	S-JTSK (Ferro)
4291	SAD69
4618	SAD69
4638	Saint Pierre et Miquelon 1950
4125	Samboja
4730	Santo 1965
4823	Sao Tome
4292	Sapper Hill 1943
4293	Schwarzeck
4195	Scoresbysund 1952
4613	Segara
4820	Segara (Jakarta)
4294	Segora
4616	Selvagem Grande
4295	Serindung
4174	Sierra Leone 1924
4175	Sierra Leone 1968
4170	SIRGAS 1995
4674	SIRGAS 2000
4765	Slovenia 1996
4718	Solomon 1968
4722	South Georgia 1968
4164	South Yemen
4075	SREF98
4138	St. George Island
4710	St. Helena 1971
4605	St. Kitts 1955
4136	St. Lawrence Island
4606	St. Lucia 1955
4137	St. Paul Island
4607	St. Vincent 1945
4643	ST71 Belep
4642	ST84 Ile des Pins
4635	ST87 Ouvea
4750	ST87 Ouvea
4296	Sudan
4757	SVY21
4619	SWEREF99
4629	Tahaa 54
4628	Tahiti 52
4690	Tahiti 79
4297	Tananarive
4810	Tananarive (Paris)
4303	TC(1948)
4707	Tern Island 1961
4127	Tete
4298	Timbalai 1948
4299	TM65
4300	TM75
4301	Tokyo
4302	Trinidad 1903
4734	Tristan 1968
3821	TWD67
3824	TWD97
4001	Unknown datum based upon the Airy 1830 ellipsoid
4002	Unknown datum based upon the Airy Modified 1849 ellipsoid
4003	Unknown datum based upon the Australian National Spheroid
4035	Unknown datum based upon the Authalic Sphere
4041	Unknown datum based upon the Average Terrestrial System 1977 ellipsoid
4004	Unknown datum based upon the Bessel 1841 ellipsoid
4005	Unknown datum based upon the Bessel Modified ellipsoid
4006	Unknown datum based upon the Bessel Namibia ellipsoid
4007	Unknown datum based upon the Clarke 1858 ellipsoid
4008	Unknown datum based upon the Clarke 1866 ellipsoid
4009	Unknown datum based upon the Clarke 1866 Michigan ellipsoid
4013	Unknown datum based upon the Clarke 1880 (Arc) ellipsoid
4010	Unknown datum based upon the Clarke 1880 (Benoit) ellipsoid
4011	Unknown datum based upon the Clarke 1880 (IGN) ellipsoid
4012	Unknown datum based upon the Clarke 1880 (RGS) ellipsoid
4014	Unknown datum based upon the Clarke 1880 (SGA 1922) ellipsoid
4034	Unknown datum based upon the Clarke 1880 ellipsoid
4042	Unknown datum based upon the Everest (1830 Definition) ellipsoid
4015	Unknown datum based upon the Everest 1830 (1937 Adjustment) ellipsoid
4044	Unknown datum based upon the Everest 1830 (1962 Definition) ellipsoid
4016	Unknown datum based upon the Everest 1830 (1967 Definition) ellipsoid
4045	Unknown datum based upon the Everest 1830 (1975 Definition) ellipsoid
4018	Unknown datum based upon the Everest 1830 Modified ellipsoid
4031	Unknown datum based upon the GEM 10C ellipsoid
4036	Unknown datum based upon the GRS 1967 ellipsoid
4019	Unknown datum based upon the GRS 1980 ellipsoid
4020	Unknown datum based upon the Helmert 1906 ellipsoid
4021	Unknown datum based upon the Indonesian National Spheroid
4022	Unknown datum based upon the International 1924 ellipsoid
4024	Unknown datum based upon the Krassowsky 1940 ellipsoid
4025	Unknown datum based upon the NWL 9D ellipsoid
4032	Unknown datum based upon the OSU86F ellipsoid
4033	Unknown datum based upon the OSU91A ellipsoid
4027	Unknown datum based upon the Plessis 1817 ellipsoid
4028	Unknown datum based upon the Struve 1860 ellipsoid
4029	Unknown datum based upon the War Office ellipsoid
4043	Unknown datum based upon the WGS 72 ellipsoid
4030	Unknown datum based upon the WGS 84 ellipsoid
4052	Unspecified datum based upon the Clarke 1866 Authalic Sphere
4047	Unspecified datum based upon the GRS 1980 Authalic Sphere
4054	Unspecified datum based upon the Hughes 1980 ellipsoid
4053	Unspecified datum based upon the International 1924 Authalic Sphere
4748	Vanua Levu 1915
4676	Vientiane 1982
4752	Viti Levu 1912
4731	Viti Levu 1916
4756	VN-2000
4304	Voirol 1875
4811	Voirol 1875 (Paris)
4671	Voirol 1879
4821	Voirol 1879 (Paris)
4733	Wake Island 1952
4760	WGS 66
4322	WGS 72
4324	WGS 72BE
4326	WGS 84
4610	Xian 1980
4309	Yacare
4163	Yemen NGN96
4310	Yoff
4311	Zanderij

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Coordinate Conversion Software

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Eye4Software Coordinate Calculator

Using the Eye4Software Coordinate Calculator, you can convert coordinates from one map datum to another easily, using the user friendly user interface. This software is shipped with a database containing allmost any map datum, reference ellipsoid and map grid around.

For more information, please have a look at the Eye4Software Coordinate Calculator product page.

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Eye4Software GPS Toolkit

Using the Eye4Software GPS Toolkit which is a GPS SDK (Software Developer Kit), you will be able to add coordinate conversions to your own software, scripts or webpages in the blink of an eye. The SDK can be used with various programming environments including: Visual Basic, Visual C++, Visual Basic .NET, Visual C# .NET, VB Script, Borland Delphi, Borland C++ Builder, VBA (Access and Excel) and more.

For more information please have a look at the Eye4Software GPS Toolkit product page.

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Datum Transformation Code Samples

Perform a map datum transformation using Visual C++...
Perform a map datum transformation using Visual Basic...
Perform a map datum transformation using Visual C# .NET...
Perform a map datum transformation using Visual Basic .NET...
Perform a map datum transformation using Delphi...
Perform a map datum transformation using VBScript...

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