| Maptitude GISDK Help |
For many datasets, a datum conversion can be specified to transform the dataset to a different datum. When importing, the transformation is applied after the inverse projection. When exporting, the transformation is applied prior to the projection.
The transformation is specified with the NAD Conversion option, which requires the source and destination datum, and sometimes a third parameter that indicates the conversion method or grid file.
For U.S. datasets, Maptitude uses NADCON, the federal standard, to convert between the North American 1927/Old Island (NAD27), North American 1983 (NAD83), and North American 1983 HPGN/HARN (NAD83HP) datums. If the conversion is either to or from NAD83HP, you must specify the HP conversion file; otherwise leave the third parameter null. The following table lists the currently available HP conversion files in the Datum folder:
| File Name | Coverage |
|---|---|
| alhpgn | Alabama |
| arhpgn | Arkansas |
| azhpgn | Arizona |
| eshpgn | American Samoa (E of 170th Meridian) |
| wshpgn | American Samoa (W of 170th Meridian) |
| cnhpgn | California (N of 37th Parallel) |
| cshpgn | California (S of 37th Parallel) |
| cohpgn | Colorado |
| mdhpgn | Delaware, Maryland, District of Columbia |
| flhpgn | Florida |
| gahpgn | Georgia |
| guhpgn | Guam and Northern Marianas Islands |
| hihpgn | Hawaii |
| emhpgn | Idaho & Montana (E of 113rd Meridian) |
| wmhpgn | Idaho & Montana (W of 113rd Meridian) |
| ilhpgn | Illinois |
| inhpgn | Indiana |
| iahpgn | Iowa |
| kshpgn | Kansas |
| kyhpgn | Kentucky |
| lahpgn | Louisiana |
| mehpgn | Maine |
| mihpgn | Michigan (except Isle Royale) |
| mnhpgn | Minnesota |
| mshpgn | Mississippi |
| mohpgn | Missouri |
| nbhpgn | Nebraska |
| nvhpgn | Nevada |
| nehpgn | New England (except Maine) |
| njhpgn | New Jersey |
| nmhpgn | New Mexico |
| nyhpgn | New York |
| ndhpgn | North Dakota |
| ohhpgn | Ohio |
| okhpgn | Oklahoma |
| wohpgn | Oregon & Washington |
| pahpgn | Pennsylvania |
| pvhpgn | Puerto Rico & Virgin Islands |
| sdhpgn | South Dakota |
| tnhpgn | Tennessee |
| ethpgn | Texas (E of 100th Meridian) |
| wthpgn | Texas (W of 100th Meridian) |
| uthpgn | Utah |
| vahpgn | Virginia |
| wihpgn | Wisconsin |
| wvhpgn | West Virginia |
| wyhpgn | Wyoming |
Here are some examples:
// Convert from NAD27 to NAD83
...
{"NAD Conversion", "NAD27", "NAD83",}
...
// Convert from NAD27 to NAD83HP for Maine
...
{"NAD Conversion", "NAD27", "NAD83HP", "datum\\mehpgn"}
...
For Canadian datasets, Maptitude uses NTv2, the Canadian standard, to convert between the North American 1927 datum (NAD27), the May 1976 Adjustment of NAD27 used in Ontario (MAY76), or the Average Terrestrial System of 1977 used in New Brunswick (ATS77), and the North American 1983 datum (NAD83). Direct conversion is not supported between NAD27 and MAY76 or ATS77. If the conversion is between NAD27 and NAD83, then the third parameter must be "NTv2" to distinguish it from the NADCON conversion.
For conversions in New Brunswick between ATS77 and NAD83, the NB7783v2.GSB grid shift file is required. It is available for C$100 directly from Service New Brunswick (http://www.snb.ca/). It needs to be installed in the Datum folder of the Maptitude program folder. Here are some examples:
// Convert from NAD27 to NAD83
...
{"NAD Conversion", "NAD27", "NAD83", "NTV2_0.GSB"}
...
// Convert from ATS77 to NAD83
...
{"NAD Conversion", "ATS77", "NAD83","NB7783v2.GSB"
...
For the following countries, Maptitude uses NTv2 to convert between the datums. The NAD Conversion option is specified as shown above, with the appropriate grid shift file as the third parameter. Here is a list:
Australia: AGD66 to GDA94
Australia: GDA94 to AGD66
Australia: AGD84 to GDA94
Australia: GDA94 to AGD84
Austria: MGI to ETRS89
Austria: ETRS89 to MGI
Brazil: CA61 to SIRGAS2000
Brazil: SIRGAS2000 to CA61
Brazil: CA7072 to SIRGAS2000
Brazil: SIRGAS2000 to CA7072
Brazil: SAD69 to SIRGAS2000
Brazil: SIRGAS2000 to SAD69
Brazil: SAD69(96) to SIRGAS2000
Brazil: SIRGAS2000 to SAD69(96)
France: NTF to RGF93
France: RGF93 to NTF
Germany: DHDN to ETRS89
Germany: ETRS89 to DHDN
Great Britain: OSGB36 to ETRS89
Great Britain: ETRS89 to OSGB36
Ireland: IRELAND75 to ETRS89
Ireland: ETRS89 to IRELAND75
New Zealand: NZGD49 to NZGD2000
New Zealand: NZGD2000 to NZGD49
Portugal: Datum73 to ETRS89
Portugal: ETRS89 to Datum73
Portugal: DLx to ETRS89
Portugal: ETRS89 to DLx
Portugal: ED50 to ETRS89
Portugal: ETRS89 to ED50
Portugal: DLx (Bessel) to ETRS89
Portugal: ETRS89 to DLx (Bessel)
Spain (Peninsula): ED50 to ETRS89
Spain (Peninsula): ETRS89 to ED50
Spain (Balearic Islands): ED50 to ETRS89
Spain (Balearic Islands): ETRS89 to ED50
Switzerland: CH1903 to CH1903+
Switzerland: CH1903+ to CH1903
Switzerland: CH1903 to ETRS89
Switzerland: ETRS89 to CH1903
For more details on these conversions, see "Datums" in the Maptitude Help.
For Austria, the conversion requires the AT_GIS_GRID.GSB grid shift file, available from the Bundesamt für Eich- und Vermessungswesen website: http://www.bev.gv.at. It needs to be installed in the Datum folder in the Maptitude program folder.
For other datasets worldwide, cruder methods can be employed to convert between datums. Maptitude supports the standard 3-parameter, 7-parameter and Molodensky methods. The appropriate method is determined automatically based on the datum strings used, except when "Molodensky" is specified as the third parameter to override the 3-parameter default. The following table lists the currently available datums:
| Datum Code | Coverage |
|---|
| WGS72 | WORLD GEODETIC SYSTEM 1972 |
|---|---|
| WGS84 | WORLD GEODETIC SYSTEM 1984 |
| ADI-A | ADINDAN, Ethiopia |
| ADI-B | ADINDAN, Sudan |
| ADI-C | ADINDAN, Mali |
| ADI-D | ADINDAN, Senegal |
| ADI-E | ADINDAN, Burkina Faso |
| ADI-F | ADINDAN, Cameroon |
| ADI-M | ADINDAN, Mean |
| AFG | AFGOOYE, Somalia |
| AIA | ANTIGUA ISLAND ASTRO 1943 |
| AIN-A | AIN EL ABD 1970, Bahrain |
| AIN-B | AIN EL ABD 1970, Saudi Arabia |
| AMA | AMERICAN SAMOA 1962 |
| ANO | ANNA 1 ASTRO 1965, Cocos Is. |
| ARF-A | ARC 1950, Botswana |
| ARF-B | ARC 1950, Lesotho |
| ARF-C | ARC 1950, Malawi |
| ARF-D | ARC 1950, Swaziland |
| ARF-E | ARC 1950, Zaire |
| ARF-F | ARC 1950, Zambia |
| ARF-G | ARC 1950, Zimbabwe |
| ARF-H | ARC 1950, Burundi |
| ARF-M | ARC 1950, Mean |
| ARS | ARC 1960, Kenya & Tanzania |
| ASC | ASCENSION ISLAND 1958 |
| ASM | MONTSERRAT ISLAND ASTRO 1958 |
| ASQ | ASTRO STATION 1952, Marcus Is. |
| ATF | ASTRO BEACON E 1845, Iwo Jima |
| AUA | AUSTRALIAN GEODETIC 1966 |
| AUG | AUSTRALIAN GEODETIC 1984 |
| BAT | DJAKARTA, INDONESIA |
| BER | BERMUDA 1957, Bermuda Islands |
| BID | BISSAU, Guinea-Bissau |
| BOO | BOGOTA OBSERVATORY, Columbia |
| BUR | BUKIT RIMPAH, Banka & Belitung |
| CAC | CAPE CANAVERAL, Florida & Bahamas |
| CAI | CAMPO INCHAUSPE 1969, Argentina |
| CAO | CANTON ASTRO 1966, Phoenix Is. |
| CAP | CAPE, South Africa |
| CAZ | CAMP AREA ASTRO, Camp McMurdo |
| CCD | S-JTSK, Czech Republic |
| CGE | CARTHAGE, Tunisia |
| CHI | CHATHAM ISLAND ASTRO 1971, NZ |
| CHU | CHUA ASTRO, Paraguay |
| COA | CORREGO ALEGRE, Brazil |
| DAL | DABOLA, Guinea |
| DID | DECEPTION ISLAND |
| DOB | GUX 1 ASTRO, Guadalcanal Is. |
| EAS | EASTER ISLAND 1967 |
| ENW | WAKE-ENIWETOK 1960 |
| EUR-7 | EUROPEAN 1950, Mean (7-Parameter) |
| EUR-A | EUROPEAN 1950, Western Europe |
| EUR-B | EUROPEAN 1950, Greece |
| EUR-C | EUROPEAN 1950, Norway & Finland |
| EUR-D | EUROPEAN 1950, Portugal & Spain |
| EUR-E | EUROPEAN 1950, Cyprus |
| EUR-F | EUROPEAN 1950, Egypt |
| EUR-G | EUROPEAN 1950, England, Channel |
| EUR-H | EUROPEAN 1950, Iran |
| EUR-I | EUROPEAN 1950, Sardinia (Italy) |
| EUR-J | EUROPEAN 1950, Sicily (Italy) |
| EUR-K | EUROPEAN 1950, England, Ireland |
| EUR-L | EUROPEAN 1950, Malta |
| EUR-M | EUROPEAN 1950, Mean (3-Parameter) |
| EUR-S | EUROPEAN 1950, Iraq, Israel |
| EUR-T | EUROPEAN 1950, Tunisia |
| EUS | EUROPEAN 1979 |
| FAH | OMAN |
| FLO | OBSERVATORIO MET. 1939, Flores |
| FOT | FORT THOMAS 1955, Leeward Is. |
| GAA | GAN 1970, Rep. of Maldives |
| GEO | GEODETIC DATUM 1949, NZ |
| GIZ | DOS 1968, Gizo Island |
| GRA | GRACIOSA BASE SW 1948, Azores |
| GUA | GUAM 1963 |
| GSE | GUNUNG SEGARA, Indonesia |
| HEN | HERAT NORTH, Afghanistan |
| HIT | PROVISIONAL SOUTH CHILEAN 1963 |
| HJO | HJORSEY 1955, Iceland |
| HKD | HONG KONG 1963 |
| HTN | HU-TZU-SHAN, Taiwan |
| IBE | BELLEVUE (IGN), Efate Is. |
| IDN | INDONESIAN 1974 |
| IND-B | INDIAN, Bangladesh |
| IND-I | INDIAN, India & Nepal |
| IND-P | INDIAN, Pakistan |
| INF-A | INDIAN 1954, Thailand |
| ING-A | INDIAN 1960, Vietnam 16N |
| ING-B | INDIAN 1960, Con Son Island |
| INH-A | INDIAN 1975, Thailand |
| IRL | IRELAND 1965 |
| ISG | ISTS 061 ASTRO 1968, S Georgia |
| IST | ISTS 073 ASTRO 1969, Diego Garcia |
| JOH | JOHNSTON ISLAND 1961 |
| KAN | KANDAWALA, Sri Lanka |
| KEA | KERTAU 1948, W Malaysia & Sing. |
| KEG | KERGUELEN ISLAND 1949 |
| KUS | KUSAIE ASTRO 1951, Caroline Is. |
| LCF | L.C. 5 ASTRO 1961, Cayman Brac |
| LEH | LEIGON, Ghana |
| LIB | LIBERIA 1964 |
| LUZ-A | LUZON, Philippines |
| LUZ-B | LUZON, Mindanao Island |
| MAS | MASSAWA, Ethiopia |
| MER | MERCHICH, Morocco |
| MID | MIDWAY ASTRO 1961, Midway Is. |
| MIK | MAHE 1971, Mahe Is. |
| MIN-A | MINNA, Cameroon |
| MIN-B | MINNA, Nigeria |
| MOD | ROME 1940, Sardinia |
| MPO | M'PORALOKO, Gabon |
| MVS | VITI LEVU 1916, Viti Levu Is. |
| NAH-A | NAHRWAN, Masirah Island (Oman) |
| NAH-B | NAHRWAN, United Arab Emirates |
| NAH-C | NAHRWAN, Saudi Arabia |
| NAP | NAPARIMA, Trinidad & Tobago |
| NAR-A | NORTH AMERICAN 1983, Alaska |
| NAR-B | NORTH AMERICAN 1983, Canada |
| NAR-C | NORTH AMERICAN 1983, CONUS |
| NAR-D | NORTH AMERICAN 1983, Mexico |
| NAR-E | NORTH AMERICAN 1983, Aleutian |
| NAR-H | NORTH AMERICAN 1983, Hawai'i |
| NAS-A | NORTH AMERICAN 1927, Eastern US |
| NAS-B | NORTH AMERICAN 1927, Western US |
| NAS-C | NORTH AMERICAN 1927, CONUS |
| NAS-D | NORTH AMERICAN 1927, Alaska |
| NAS-E | NORTH AMERICAN 1927, Canada |
| NAS-F | NORTH AMERICAN 1927, Alberta/BC |
| NAS-G | NORTH AMERICAN 1927, E. Canada |
| NAS-H | NORTH AMERICAN 1927, Man/Ont |
| NAS-I | NORTH AMERICAN 1927, NW Terr. |
| NAS-J | NORTH AMERICAN 1927, Yukon |
| NAS-L | NORTH AMERICAN 1927, Mexico |
| NAS-N | NORTH AMERICAN 1927, C. America |
| NAS-O | NORTH AMERICAN 1927, Canal Zone |
| NAS-P | NORTH AMERICAN 1927, Caribbean |
| NAS-Q | NORTH AMERICAN 1927, Bahamas |
| NAS-R | NORTH AMERICAN 1927, San Salv. |
| NAS-T | NORTH AMERICAN 1927, Cuba |
| NAS-U | NORTH AMERICAN 1927, Greenland |
| NAS-V | NORTH AMERICAN 1927, Aleutian E |
| NAS-W | NORTH AMERICAN 1927, Aleutian W |
| NSD | NORTH SAHARA 1959, Algeria |
| OEG | OLD EGYPTIAN 1907 |
| OGB_7 | ORDNANCE GB 1936, Mean (7-Parameter) |
| OGB-A | ORDNANCE GB 1936, England |
| OGB-B | ORDNANCE GB 1936, Eng., Wales |
| OGB-C | ORDNANCE GB 1936, Scotland |
| OGB-D | ORDNANCE GB 1936, Wales |
| OGB-M | ORDNANCE GB 1936, Mean (3-Parameter) |
| OHA-A | OLD HAWAI'IAN (CC), Hawai'i |
| OHA-B | OLD HAWAI'IAN (CC), Kauai |
| OHA-C | OLD HAWAI'IAN (CC), Maui |
| OHA-D | OLD HAWAI'IAN (CC), Oahu |
| OHA-M | OLD HAWAI'IAN (CC), Mean |
| OHI-A | OLD HAWAI'IAN (IN), Hawai'i |
| OHI-B | OLD HAWAI'IAN (IN), Kauai |
| OHI-C | OLD HAWAI'IAN (IN), Maui |
| OHI-D | OLD HAWAI'IAN (IN), Oahu |
| OHI-M | OLD HAWAI'IAN (IN), Mean |
| PHA | AYABELLA LIGHTHOUSE, Bjibouti |
| PIT | PITCAIRN ASTRO 1967 |
| PLN | PICO DE LAS NIEVES, Canary Is. |
| POS | PORTO SANTO 1936, Madeira Is. |
| PRP-A | PROV. S AMERICAN 1956, Bolivia |
| PRP-B | PROV. S AMERICAN 1956, N Chile |
| PRP-C | PROV. S AMERICAN 1956, S Chile |
| PRP-D | PROV. S AMERICAN 1956, Colombia |
| PRP-E | PROV. S AMERICAN 1956, Ecuador |
| PRP-F | PROV. S AMERICAN 1956, Guyana |
| PRP-G | PROV. S AMERICAN 1956, Peru |
| PRP-H | PROV. S AMERICAN 1956, Venezuela |
| PRP-M | PROV. S AMERICAN 1956, Mean |
| PTB | POINT 58, Burkina Faso & Niger |
| PTN | POINT NOIRE 1948 |
| PUK | PULKOVO 1942, Russia |
| PUR | PUERTO RICO & Virgin Is. |
| QAT | QATAR NATIONAL |
| QUO | QORNOQ, South Greenland |
| REU | REUNION, Mascarene Is. |
| SAE | SANTO (DOS) 1965 |
| SAN-A | SOUTH AMERICAN 1969, Argentina |
| SAN-B | SOUTH AMERICAN 1969, Bolivia |
| SAN-C | SOUTH AMERICAN 1969, Brazil |
| SAN-D | SOUTH AMERICAN 1969, Chile |
| SAN-E | SOUTH AMERICAN 1969, Colombia |
| SAN-F | SOUTH AMERICAN 1969, Ecuador |
| SAN-G | SOUTH AMERICAN 1969, Guyana |
| SAN-H | SOUTH AMERICAN 1969, Paraguay |
| SAN-I | SOUTH AMERICAN 1969, Peru |
| SAN-J | SOUTH AMERICAN 1969, Baltra |
| SAN-K | SOUTH AMERICAN 1969, Trinidad |
| SAN-L | SOUTH AMERICAN 1969, Venezuela |
| SAN-M | SOUTH AMERICAN 1969, Mean |
| SAO | SAO BRAZ, Santa Maria Is. |
| SAP | SAPPER HILL 1943, E Falkland Is |
| SCK | SCHWARZECK, Namibia |
| SGM | SELVAGEM GRADE 1938, Salvage Is |
| SHB | ASTRO DOS 71/4, St. Helena Is. |
| SOA | SOUTH ASIA, Singapore |
| SPK | S-42 (PULKOVO 1942), Hungary |
| TAN | TANANARIVE OBSERVATORY 1925 |
| TDC | TRISTAN ASTRO 1968 |
| TIL | TIMBALAI 1948, Brunei & E Malay |
| TOY-A | TOKYO, Japan |
| TOY-C | TOKYO, Okinawa |
| TOY-B | TOKYO, South Korea |
| TOY-M | TOKYO, Mean |
| TRN | ASTRO TERN ISLAND (FRIG) 1961 |
| VOR | VOIROL 1960, Algeria |
| WAK | WAKE ISLAND ASTRO 1952 |
| YAC | YACARE, Uruguay |
| ZAN | ZANDERIJ, Suriname |
// Convert from HJORSEY (Iceland) to WGS84
...
{"NAD Conversion", "HJO", "WGS84",}
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