GeoDLL - Geodetic Development Kit
Download of the supported NTv2 / HARN grid files

•  Detailed Description of the current Version
•  User Manual with all Function Descriptions
•  User Manual searching for expressions
•  List of Coordinate and Reference Systems
•  Download of the supported NTv2 / HARN grid files
•  Programming example  Group Prices GeoDLL
•  Download  Place order

GeoDLL - Function Groups

•  Function group "Coordinate Transformations"
•  Additional function group "NTv2 Transformations"
•  Function group "NTv2 Tools"
•  Function group "User Definitions"
•  Function group "Parameter Determination"
•  Function group "Distance Calculations"
•  Function group "Notation Calculations"
•  Function group "Map Calculations"
•  Function group "Elevation Calculations"
•  Function group "Transformation Parameter"
•  Function group "Time Zone Calculations"
•  Geodetic functions without group assignment

Continental Drift
At present 2 to 7 cm per year

 Go directly to the download list of the available NTv2 files
NTv2 gridfiles in GSB and GSA file format

NTv2 (National Transformation version 2) datum shifts are done with grid files which comes in a binary format (GSB) and an ASCII format (GSA). It can transform coordinates between two different geodetic reference systems. The transformation provides heigh actuality and does not require ellipsoidal heights.

HARN gridfiles

The geodetic functionslibrary GeoDLL is prepared for coordinate transformations with arbitrary NTv2 gridfiles and with the American HARN gridfiles. But the HARN gridfiles of the U.S. states are available as equivalent NTv2 gridfiles. All by GeoDLL supported NTv2 and HARN gridfiles can be downloaded from this website.

Support of the NTv2 standard by the Geodetic Development Kit GeoDLL

The NTv2 method uses binary files to perform accurate datum shifts from one geodetic Reference System to an other. An NTv2 file contains the differences between the two Reference Systems as geographic seconds in a grid. A bilinear interpolation is used to calculate the exact coordinates for a point in the target Reference System.

NTv2 is designed to check multiple grids for the most accurate shift information. An NTv2 file contains a low density base grid (parent). Certain areas such as cities can have high density local grids. The local grids overlay portions of the base grid. If a point is within one of the high density grids, NTv2 will use the high density grid, otherwise, the point falls through to the low density grid.

A description of the NTv2 algorithm can be found in the following sources:

1. Junkins, D.R., and S.A. Farley, NTv2 Developers Guide; Geodetic Survey Division, Natural Resources Canada, 1995.
2. Junkins, D.R., and S.A. Farley, NTv2 Users Guide; Geodetic Survey Division, Natural Resources Canada, 1995.
3. Staatsbetrieb Geobasisinformation und Vermessung Sachsen,  Geobasisinformation und Vermessung.

Download of the NTv2 gridfiles in binary format

Here the NTv2 binary files are listed, which are supported by the geodetic Library GeoDLL and the program TRANSDATpro. In the second line always the original source is shown, from which the original NTv2 file can be downloaded and information about the associated geodetic Reference Systems are given. In the third line is a link, from which the NTv2 file can be download direct from the KilletSoft server. It is recommended to use the original NTv2 files from the original sources, because the actuality of the files stored on the KilletSoft server is not guaranteed.

Important notes:
If you want to use the here listed NTv2 files, you must necessarily note the terms and conditions of their authors! All rights and liabilities, resulting from the use of the data, bears solely the user! KilletSoft does not guarantee the accuracy of the data!

The blue marked NTv2 files have been provided by the authors only for use with KilletSoft products. Therefore, they are encrypted and only work with the Geodetic Development Kit GeoDLL and with the program TRANSDATpro! These files are special licensed to KilletSoft by their authors.

The red marked NTv2 files can be ordered or purchased only directly from the authors. The Geodetic Development Kit GeoDLL and the program TRANSDATpro are already prepared for the use of these NTv2 files. For the registration of the respective NTv2 file with the author KilletSoft presents the Registration Address of the author in a downloadable file.

The orange marked NTv2 files are available only as testdata at time. They can be ordered directly from the authors or can be downloades from their website. The Geodetic Development Kit GeoDLL and the program TRANSDATpro are already prepared for the use of these NTv2 files.

1. NTv2 solutions sorted alphabetically by continents and countries
2.  Australasian continent
3.  European continent
4.  North American continent
5.  South American continent

1. Australasian continent  Go to Continent Selection
2. Australia: GDA94_GDA2020_conformal.gsb, GDA2020 <==> GDA94
   Original data:  ICSM GitHub transformation grid repository.
   KilletSoft:  Download GDA94_GDA2020_C
3. Australia: GDA94_GDA2020_conformal_and_distortion.gsb, GDA2020 <==> GDA94
   Original data:  ICSM GitHub transformation grid repository.
   KilletSoft:  Download GDA94_GDA2020_CD
4. Australia: National_84_dd_mm_yy.gsb (A84_NAT.gsb), AGD84 <==> GDA94
   Original data:  ICSM GitHub transformation grid repository.
   KilletSoft:  Download A84_NAT
5. Australia: A66_National_dd_mm_yy.gsb (A66_NAT.gsb), AGD66 <==> GDA94
   Original data:  ICSM GitHub transformation grid repository.
   KilletSoft:  Download A66_NAT
6. New Zealand: NZGD2KGR.gsb, NZGD49 <==> NZGD2000
   Original data:  Land Information New Zealand: Download Geodetic Software.
   KilletSoft:  Download NZGD2KGR

1. European continent  Go to Continent Selection
2. Austria: AT_GIS_GRID.gsb, MGI <==> ETRS89
   Original data:  BEV - Bundesamt für Eich- und Vermessungswesen.
   KilletSoft:  Download AT_GIS_GRID
3. France: NTF_R93.gsb, NTF <==> RGF93
   Original data:  IGN (Institut Géographique National): Projet "Lambert 93".
   KilletSoft:  Download NTF_R93
4. France: FRANCE.gsb, NTF <==> RGF93
   Original data:  Paul Kelly: Creation of NTv2 Grid File for France.
   KilletSoft:  Download FRANCE
5. Germany: BeTA2007.gsb, DHDN90 <==> ETRS89
   Original data:  Bundesamt für Kartographie und Geodäsie.
   KilletSoft:  Download BeTA2007
6. Germany (Baden-Württemberg): BWTA2017.gsb, DHDN90 <==> ETRS89
   Original data:  Landesamt für Geoinformation Baden-Württemberg.
   KilletSoft:  Hint about the Download Address
7. Germany (Bavaria): BY_KanU.gsb (2019), DHDN90 <==> ETRS89
   Original data:  Bayerische Vermessungsverwaltung.
   KilletSoft:  Hint about the Download Address
8. Germany (Bavaria): NTv2-Ba.gsb (2011), DHDN90 <==> ETRS89
   Original data:  Bayerische Vermessungsverwaltung.
   KilletSoft:  Download Registration Address
9. Germany (Berlin): Ntv2berlin.gsb, DHDN90 <==> ETRS89
   Original data:  Senatsverwaltung für Stadtentwicklung und Umwelt Berlin.
   KilletSoft:  Download Ntv2berlin (© Senatsverwaltung Berlin)
10. Germany (Brandenburg): NTv2-BB.gsb, S42/83 <==> ETRS89
    Original data:  Landesvermessung und Geobasisinformation Brandenburg.
    KilletSoft:  Download Registration Address
11. Germany (Bremen): HBTa2010.gsb, DHDN90 <==> ETRS89
    Original data:  GeoInformation Bremen.
    KilletSoft:  Download HBTa2010 (© GeoInformation Bremen)
12. Germany (Hamburg): Beta_FHH_NW.gsb, DHDN90 <==> ETRS89
    Germany (Hamburg): NTv2-HH.gsb, DHDN90 <==> ETRS89
    Original data:  Landesbetrieb Geoinformation und Vermessung Hamburg.
    KilletSoft:  Download NTv2 Hamburg (© GeoInformation Hamburg)
13. Germany (Hesse): HeTA2010.gsb, DHDN90 <==> ETRS89
    Original data:  HVBG - Hessische Verwaltung für Bodenmanagement und Geoinformation.
    KilletSoft:  Download HeTA2010 (© HVBG)
14. Germany (Mecklenburg-Western Pomerania): MVTR2010.gsb, RD83 <==> ETRS89
    Germany (Mecklenburg-Western Pomerania): MVTRS4283.gsb, S42/83 <==> ETRS89
    Original data:  DVZ Datenverwaltumszentrum Mecklenburg-Vorpommern GmbH.
    KilletSoft:  Download Ntv2 Mecklenburg-Western Pomerania (© DVZ MV GmbH)
15. Germany (Saarland): SeTa2009.gsb, DHDN90 <==> ETRS89
    Original data:  LVGL - Landesamt für Vermessung und Geoinformation des Saarlandes.
    KilletSoft:  Download SeTa2009
16. Germany (Saxony): SaeTA2010.gsb (5cm), RD83 <==> ETRS89
    Original data:  GeoSN - Landesvermessung Sachsen.
    KilletSoft:  Download SaeTA2010 (© GeoSN)
17. Germany (Saxony): NTv2_SN.gsb (3cm), RD83 <==> ETRS89
    Original data:  GeoSN - Landesvermessung Sachsen.
    KilletSoft:  Download Ntv2_SN (© GeoSN)
18. Germany (Saxony-Anhalt): NTv2LSBB_LSA.gsb, S42/83 <==> ETRS89
    Original data:  Landesstraßenbaubehörde Sachsen-Anhalt (LSBB).
    KilletSoft:  Download NTv2LSBB_LSA (© LSBB)
19. Germany (Thuringia): NTv2GridTh.gsb, PD83 <==> ETRS89
    Original data:  TLVermGEO - Landesamt für Vermessung und Geoinformation - Thüringen.
    KilletSoft:  Download NTv2GridTh (© TLVermGEO)
20. Great Britain: OSTN02_N.gsb, OSGB36 <==> ETRS89
    Original data:  Ordnance Survey: OSTN02 - NTv2 format.
    KilletSoft:  Download OSTN02
21. Great Britain: OSTN15_NTv2_ETRStoOSGB.gsb, OSGB36 <==> ETRS89
    Great Britain: OSTN15_NTv2_OSGBtoETRS.gsb, ETRS89 <==> OSGB36
    Original data:  Ordnance Survey: OSTN15 and OSGM15 for developers.
    KilletSoft:  Download OSTN15
22. Great Britain: ENGLAND.gsb, OSGB36 <==> ETRS89
    Original data:  Paul Kelly: OSTN02 in NTv2 format for OSGB36<-->ETRS89.
    KilletSoft:  Download ENGLAND
23. Great Britain: SCOTLAND.gsb, OSGB36 <==> ETRS89
    Original data:  Paul Kelly: OSTN02 in NTv2 format for OSGB36<-->ETRS89.
    KilletSoft:  Download SCOTLAND
24. Hungary: ETRS2EOV.gsb, EOV HD72 <==> ETRS89
    Original data:  Budapesti Müszaki es Gazdasagtudomanyi Egyetem.
    The original file etrs2eov.gsb may contain a bug, better to use the file etrs2eov_kor.gsb, corrected by KilletSoft.
    KilletSoft:  Download ETRS2EOV
25. Italy: NadED50.gsb, ED50 <==> WGS84
    Italy: NadRoma40.gsb, Roma40 <==> WGS84
    Italy: NadRoma40ED50.gsb, Roma40 <==> ED50
    Original data:  GLOBO - Grigliati NTv2 per l'Italia".
    KilletSoft:  Download NadRoma40Ed50
26. Italy (Emilia Romagna): RER_AD400_MM_ED50_V1A.gsb, Roma40 <==> ED50
    Italy (Emilia Romagna): RER_AD400_MM_ETRS89_V1A.gsb, Roma40 <==> ETRS89
    Italy (Emilia Romagna): RER_ED50_MM_ETRS89_GPS7_K2.gsb, ED50 <==> ETRS89
    Italy (Emilia Romagna): RER_MM_ED50_GPS7_K2.gsb, Roma40 <==> ED50
    Italy (Emilia Romagna): RER_MM_ETRS89_GPS7_K2.gsb, Roma40 <==> ETRS89
    Original data:  ER Geoportale - Regione Emilia-Romagna".
    KilletSoft:  Download Rer_V1A_K2
27. Netherlands: RDTRANS2018.gsb, RD/NAP <==> ETRS89
    Original data:  Netherlands - Kadaster and Rijkswaterstaat (DID and RDNAP).
    KilletSoft:  Download RDTRANS2018
28. Netherlands: RDTRANS2008.gsb, RD/NAP <==> ETRS89
    Original data:  Netherlands - Kadaster and Rijkswaterstaat (DID and RDNAP).
    KilletSoft:  Download RDTRANS2008
29. Portugal: PT73_E89.gsb, D73 <==> ETRS89
    Original data:  A vida de um Informático.
    KilletSoft:  Download PT73_E89
30. Portugal: PTLX_E89.gsb, DLX <==> ETRS89
    Original data:  A vida de um Informático.
    KilletSoft:  Download PTLX_E89
31. Portugal: PTBL_E89.gsb, B-DLX <==> ETRS89
    Original data:  A vida de um Informático.
    KilletSoft:  Download PTBL_E89
32. Portugal: PTED_E89.gsb, ED50 <==> ETRS89
    Original data:  A vida de um Informático.
    KilletSoft:  Download PTED_E89
33. Spain (Peninsula 2009): PENR2009.gsb (=R2009V2.gsb), ED50 <==> ETRS89
    Original data:  Instituto Geografico Nacional - Ministerio de Fomento.
    KilletSoft:  Download PENR2009
34. Spain (Baleares 2009): BALR2009.gsb, ED50 <==> ETRS89
    Original data:  Instituto Geografico Nacional - Ministerio de Fomento.
    KilletSoft:  Download BALR2009
35. Spain (Pen + Bal 2003): SPED2ET.gsb, ED50 <==> ETRS89
    Original data:  Instituto Geografico Nacional - Ministerio de Fomento.
    KilletSoft:  Download SPED2ET
36. Switzerland: CHENYX06etrs.gsb, CH1903 <==> ETRS89
    Original data:  Bundesamt für Landestopographie swisstopo: CHenyx06etrs.
    KilletSoft:  Download CHENYX06etrs
37. Switzerland: CHENYX06a.gsb, CH1903 <==> CH1903+
    Original data:  Bundesamt für Landestopographie swisstopo: CHenyx06a.
    KilletSoft:  Download CHENYX06a

1. North American continent  Go to Continent Selection
2. United States (HARN/HPGN): xxhpgn.gsb, 49 files, NAD83(HARN) <==> NAD83
   Original data:  OSGeo Download Server: hpgn_ntv2.zip.
   KilletSoft:  Download HARN_HPGN_NTV2
3. Canada: NTV2_0.gsb, NAD27 <==> NAD83
   Original data:  Natural Resources Canada: Canadian Spatial Reference System - NTv2.
   KilletSoft:  Download NTV2_0
4. Canada (Alberta): ABCSRSv4.gsb, NAD83 <==> NAD83(CSRS)
   Original data:  Alberta Environment and Sustainable Resource Development.
   KilletSoft:  Download Registration Address
5. Canada (British Columbia): BC_27_98.gsb, NAD27 <==> NAD83(CSRS98)
   Original data:  GeoBC - Reference Systems and Survey Monuments.
   KilletSoft:  Download BC_27_98
6. Canada (British Columbia): BC_27_05.gsb, NAD27 <==> NAD83(CSRS05)
   Original data:  GeoBC - Reference Systems and Survey Monuments.
   KilletSoft:  Download BC_27_05
7. Canada (British Columbia): BC_93_98.gsb (also BC_CSRS), NAD83(NMIP93) <==> NAD83(CSRS98)
   Original data:  GeoBC - Reference Systems and Survey Monuments.
   KilletSoft:  Download BC_93_98
8. Canada (British Columbia): BC_93_05.gsb, NAD83(NMIP93) <==> NAD83(CSRS05)
   Original data:  GeoBC - Reference Systems and Survey Monuments.
   KilletSoft:  Download BC_93_05
9. Canada (New Brunswick): NB2783V2.gsb, NAD27 <==> NAD83(CSRS)
   Original data:  Service New Brunswick - GeoNB.
   KilletSoft:  Download NB2783V2
10. Canada (New Brunswick): NB7783V2.gsb, ATS77 <==> NAD83(CSRS)
    Original data:  Service New Brunswick - GeoNB.
    KilletSoft:  Download NB7783V2
11. Canada (Nova Scotia): NS7783V2.gsb, ATS77 <==> NAD83(CSRS98)
    Original data:  Geographical Information Sciences Centre.
    KilletSoft:  Download NS7783V2
12. Canada (Nova Scotia): GS7783.gsb, ATS77 <==> NAD83
    Original data:  Geographical Information Sciences Centre.
    KilletSoft:  Download GS7783
13. Canada (Ontario): MAY76V20.gsb, NAD27(1976) <==> NAD83(ORIG)
    Original data:  Ontario Ministry of Natural Resources.
    KilletSoft:  Download Registration Address
14. Canada (Ontario): ON27CSV1.gsb, NAD27(1974) <==> NAD83(CSRS)
    Original data:  Ontario Ministry of Natural Resources.
    KilletSoft:  Download Registration Address
15. Canada (Ontario): ON27CSV1.gsb, NAD27(1976) <==> NAD83(CSRS)
    Original data:  Ontario Ministry of Natural Resources.
    KilletSoft:  Download Registration Address
16. Canada (Ontario): ON83CSV1.gsb, NAD83(ORIG) <==> NAD83(CSRS)
    Original data:  Ontario Ministry of Natural Resources.
    KilletSoft:  Download Registration Address
17. Canada (Prince Edward Island): PE7783V2.gsb, ATS77 <==> NAD83(CSRS98)
    Original data:  PEI Department of Transportation and Infrastructure Renewal.
    KilletSoft:  Download PE7783V2
18. Canada (Quebec): CQ77NA83.gsb (Esri CGQ77-83), NAD27(CGQ77) <==> NAD83
    Original data:  Géoboutique Québec, Ministère des Ressources naturelles.
    KilletSoft:  Download CQ77NA83
19. Canada (Quebec): CQ77CSRS.gsb (Esri CGQ77-98), NAD27(CGQ77) <==> NAD83(CSRS)
    Original data:  Géoboutique Québec, Ministère des Ressources naturelles.
    KilletSoft:  Download CQ77CSRS
20. Canada (Quebec): NA27NA83.gsb (Esri QUE27-83), NAD27 <==> NAD83
    Original data:  Géoboutique Québec, Ministère des Ressources naturelles.
    KilletSoft:  Download NA27NA83
21. Canada (Quebec): NA27CSRS.gsb (Esri QUE27-98), NAD27 <==> NAD83(CSRS)
    Original data:  Géoboutique Québec, Ministère des Ressources naturelles.
    KilletSoft:  Download NA27CSRS
22. Canada (Quebec): NA83CSRS.gsb (Esri NAS83-98), NAD83 <==> NAD83(CSRS)
    Original data:  Géoboutique Québec, Ministère des Ressources naturelles.
    KilletSoft:  Download NA83CSRS
23. Canada (Saskatchewan): SK27-83.gsb, NAD27 <==> NAD83
    Original data:  GeoSask - Saskatchewans Service for Maps and Land Information (Pre-packed Data Gallery).
    KilletSoft:  Download SK27-83
24. Canada (Saskatchewan): SK27-98.gsb, NAD27 <==> NAD83(CSRS98)
    Original data:  GeoSask - Saskatchewans Service for Maps and Land Information (Pre-packed Data Gallery).
    KilletSoft:  Download SK27-98
25. Canada (Saskatchewan): SK83-98.gsb, NAD83 <==> NAD83(CSRS98)
    Original data:  GeoSask - Saskatchewans Service for Maps and Land Information (Pre-packed Data Gallery).
    KilletSoft:  Download SK83-98

1. South American continent  Go to Continent Selection
2. Brazil: CA61_003.gsb, CorregoAlegre1961 <==> SIRGAS2000
   Original data:  IBGE - Instituto Brasileiro de Geografia e Estatística.
   KilletSoft:  Download CA61_003
3. Brazil: CA7072_003.gsb, CorregoAlegre1970/72 <==> SIRGAS2000
   Original data:  IBGE - Instituto Brasileiro de Geografia e Estatística.
   KilletSoft:  Download CA7072_003
4. Brazil: SAD69_003.gsb, SAD69 <==> SIRGAS2000
   Original data:  IBGE - Instituto Brasileiro de Geografia e Estatística.
   KilletSoft:  Download SAD69_003
5. Brazil: SAD96_003.gsb, SAD69(96) <==> SIRGAS2000
   Original data:  IBGE - Instituto Brasileiro de Geografia e Estatística.
   KilletSoft:  Download SAD96_003
6. Venezuela: CANOA_WGS84_mb.gsb, La Canoa <==> WGS84
   Original data:  eye4software - Juan Lucas Domínguez Rubio.
   KilletSoft:  Download CANOA_WGS84_mb

The binary NTv2 files, which are downloadable from the KilletSoft Internet site, are ZIP compressed. For unpacking the download files you need an unzip program, which you can download  from this side.