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 Development Kit GeoDLL is prepared for coordinate transformations with arbitrary NTv2 grid files and the North American HARN grid files. However, the HARN grid files of the US states are provided as equivalent NTv2 grid files. 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.

Depending on the geographic coordinate NTv2 can check several grids contained in the file for the information with the highest accuracy. An NTv2 file always contains a single-precision base grid (parent). Certain areas, such as cities, can be included in the file as local grids with a higher grid density and thus higher accuracy. These local grids overlap areas of the base grid. If a point lies within one of the grids with the higher accuracy, NTv2 will use it, otherwise the point will fall through to the base grid with the lower accuracy.

Quality analysis of GeoDLL and TRANSDATpro with NTv2 test data

The accuracy of NTv2 datum shifts with the program TRANSDATpro and the Geodetic Development Kit GeoDLL from KilletSoft has been investigated twice in detail:

1. Quality analysis by the network operator  Westnetz GmbH.
2. Quality analysis with test data of the  Survey Authorities of Germany.
   Download the  test log.

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

The red marked NTv2 files can be ordered or purchased only directly from their originators. 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 originator KilletSoft provides the Registration Address of the originator in a downloadable file.

The orange marked NTv2 files are available only as testdata at time. They can be ordered directly from the originators 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.

The black shown NTv2 files are freely available and are not restricted. They can be ordered directly from the originators 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
   Originator:  ICSM GitHub transformation grid repository.
   KilletSoft:  Download GDA94_GDA2020_C
3. Australia: GDA94_GDA2020_conformal_and_distortion.gsb, GDA2020 <==> GDA94
   Originator:  ICSM GitHub transformation grid repository.
   KilletSoft:  Download GDA94_GDA2020_CD
4. Australia: National_84_dd_mm_yy.gsb (A84_NAT.gsb), AGD84 <==> GDA94
   Originator:  ICSM GitHub transformation grid repository.
   KilletSoft:  Download A84_NAT
5. Australia: A66_National_dd_mm_yy.gsb (A66_NAT.gsb), AGD66 <==> GDA94
   Originator:  ICSM GitHub transformation grid repository.
   KilletSoft:  Download A66_NAT
6. New Zealand: NZGD2KGR.gsb, NZGD49 <==> NZGD2000
   Originator:  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
   Originator:  BEV - Bundesamt für Eich- und Vermessungswesen.
   KilletSoft:  Download AT_GIS_GRID
3. France: NTF_R93.gsb, NTF <==> RGF93
   Originator:  IGN (Institut Géographique National): Projet "Lambert 93".
   KilletSoft:  Download NTF_R93
4. France: FRANCE.gsb, NTF <==> RGF93
   Originator:  Paul Kelly: Creation of NTv2 Grid File for France.
   KilletSoft:  Download FRANCE
5. Germany: BeTA2007.gsb, DHDN90 <==> ETRS89
   Originator:  Bundesamt für Kartographie und Geodäsie.
   KilletSoft:  Download BeTA2007
6. Germany (Baden-Württemberg): BWTA2017.gsb, DHDN90 <==> ETRS89
   Originator:  Landesamt für Geoinformation Baden-Württemberg.
   KilletSoft:  Hint about the Download Address
7. Germany (Bavaria): BY_KanU.gsb (2019), DHDN90 <==> ETRS89
   Originator:  Bayerische Vermessungsverwaltung.
   KilletSoft:  Hint about the Download Address
8. Germany (Bavaria): NTv2-Ba.gsb (2011), DHDN90 <==> ETRS89
   Originator:  Bayerische Vermessungsverwaltung.
   KilletSoft:  Download Registration Address
9. Germany (Berlin): Ntv2berlin.gsb, DHDN90 <==> ETRS89
   Originator:  Senatsverwaltung für Stadtentwicklung und Umwelt Berlin.
   KilletSoft:  Download Ntv2berlin (© Senatsverwaltung Berlin)
10. Germany (Brandenburg): NTv2-BB.gsb, S42/83 <==> ETRS89
    Originator:  Landesvermessung und Geobasisinformation Brandenburg.
    KilletSoft:  Download Registration Address
11. Germany (Bremen): HBTa2010.gsb, DHDN90 <==> ETRS89
    Originator:  GeoInformation Bremen.
    KilletSoft:  Download HBTa2010 (© GeoInformation Bremen)
12. Germany (Hamburg): Beta_FHH_NW.gsb, DHDN90 <==> ETRS89
    Germany (Hamburg): NTv2-HH.gsb, DHDN90 <==> ETRS89
    Originator:  Landesbetrieb Geoinformation und Vermessung Hamburg.
    KilletSoft:  Download NTv2 Hamburg (© GeoInformation Hamburg)
13. Germany (Hesse): HeTA2010.gsb, DHDN90 <==> ETRS89
    Originator:  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
    Originator:  DVZ Datenverwaltumszentrum Mecklenburg-Vorpommern GmbH.
    KilletSoft:  Download Ntv2 Mecklenburg-Western Pomerania (© DVZ MV GmbH)
15. Germany (Saarland): SeTa2009.gsb, DHDN90 <==> ETRS89
    Originator:  LVGL - Landesamt für Vermessung und Geoinformation des Saarlandes.
    KilletSoft:  Download SeTa2009
16. Germany (Saxony): SaeTA2010.gsb (5cm), RD83 <==> ETRS89
    Originator:  GeoSN - Landesvermessung Sachsen.
    KilletSoft:  Download SaeTA2010 (© GeoSN)
17. Germany (Saxony): NTv2_SN.gsb (3cm), RD83 <==> ETRS89
    Originator:  GeoSN - Landesvermessung Sachsen.
    KilletSoft:  Download Ntv2_SN (© GeoSN)
18. Germany (Saxony-Anhalt): NTv2LSBB_LSA.gsb, S42/83 <==> ETRS89
    Originator:  Landesstraßenbaubehörde Sachsen-Anhalt (LSBB).
    KilletSoft:  Download NTv2LSBB_LSA (© LSBB)
19. Germany (Thuringia): NTv2GridTh.gsb, PD83 <==> ETRS89
    Originator:  TLVermGEO - Landesamt für Vermessung und Geoinformation - Thüringen.
    KilletSoft:  Download NTv2GridTh (© TLVermGEO)
20. Great Britain: OSTN02_N.gsb, OSGB36 <==> ETRS89
    Originator:  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
    Originator:  Ordnance Survey: OSTN15 and OSGM15 for developers.
    KilletSoft:  Download OSTN15
22. Great Britain: ENGLAND.gsb, OSGB36 <==> ETRS89
    Originator:  Paul Kelly: OSTN02 in NTv2 format for OSGB36<-->ETRS89.
    KilletSoft:  Download ENGLAND
23. Great Britain: SCOTLAND.gsb, OSGB36 <==> ETRS89
    Originator:  Paul Kelly: OSTN02 in NTv2 format for OSGB36<-->ETRS89.
    KilletSoft:  Download SCOTLAND
24. Hungary: ETRS2EOV.gsb, EOV HD72 <==> ETRS89
    Originator:  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
    Originator:  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
    Originator:  ER Geoportale - Regione Emilia-Romagna".
    KilletSoft:  Download Rer_V1A_K2
27. Netherlands: RDTRANS2018.gsb, RD/NAP <==> ETRS89
    Originator:  Netherlands - Kadaster and Rijkswaterstaat (DID and RDNAP).
    KilletSoft:  Download RDTRANS2018
28. Netherlands: RDTRANS2008.gsb, RD/NAP <==> ETRS89
    Originator:  Netherlands - Kadaster and Rijkswaterstaat (DID and RDNAP).
    KilletSoft:  Download RDTRANS2008
29. Portugal: PT73_E89.gsb, D73 <==> ETRS89
    Originator:  A vida de um Informático.
    KilletSoft:  Download PT73_E89
30. Portugal: PTLX_E89.gsb, DLX <==> ETRS89
    Originator:  A vida de um Informático.
    KilletSoft:  Download PTLX_E89
31. Portugal: PTBL_E89.gsb, B-DLX <==> ETRS89
    Originator:  A vida de um Informático.
    KilletSoft:  Download PTBL_E89
32. Portugal: PTED_E89.gsb, ED50 <==> ETRS89
    Originator:  A vida de um Informático.
    KilletSoft:  Download PTED_E89
33. Spain (Peninsula 2009): PENR2009.gsb (=R2009V2.gsb), ED50 <==> ETRS89
    Originator:  Instituto Geografico Nacional - Ministerio de Fomento.
    KilletSoft:  Download PENR2009
34. Spain (Baleares 2009): BALR2009.gsb, ED50 <==> ETRS89
    Originator:  Instituto Geografico Nacional - Ministerio de Fomento.
    KilletSoft:  Download BALR2009
35. Spain (Pen + Bal 2003): SPED2ET.gsb, ED50 <==> ETRS89
    Originator:  Instituto Geografico Nacional - Ministerio de Fomento.
    KilletSoft:  Download SPED2ET
36. Switzerland: CHENYX06etrs.gsb, CH1903 <==> ETRS89
    Originator:  Bundesamt für Landestopographie swisstopo: CHenyx06etrs.
    KilletSoft:  Download CHENYX06etrs
37. Switzerland: CHENYX06a.gsb, CH1903 <==> CH1903+
    Originator:  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
   Originator:  OSGeo Download Server: hpgn_ntv2.zip.
   KilletSoft:  Download HARN_HPGN_NTV2
3. Canada: NTV2_0.gsb, NAD27 <==> NAD83
   Originator:  Natural Resources Canada: Canadian Spatial Reference System - NTv2.
   KilletSoft:  Download NTV2_0
4. Canada (Alberta): ABCSRSv4.gsb, NAD83 <==> NAD83(CSRS)
   Originator:  Alberta Environment and Sustainable Resource Development.
   KilletSoft:  Download Registration Address
5. Canada (British Columbia): BC_27_98.gsb, NAD27 <==> NAD83(CSRS98)
   Originator:  GeoBC - Reference Systems and Survey Monuments.
   KilletSoft:  Download BC_27_98
6. Canada (British Columbia): BC_27_05.gsb, NAD27 <==> NAD83(CSRS05)
   Originator:  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)
   Originator:  GeoBC - Reference Systems and Survey Monuments.
   KilletSoft:  Download BC_93_98
8. Canada (British Columbia): BC_93_05.gsb, NAD83(NMIP93) <==> NAD83(CSRS05)
   Originator:  GeoBC - Reference Systems and Survey Monuments.
   KilletSoft:  Download BC_93_05
9. Canada (New Brunswick): NB2783V2.gsb, NAD27 <==> NAD83(CSRS)
   Originator:  Service New Brunswick - GeoNB.
   KilletSoft:  Download NB2783V2
10. Canada (New Brunswick): NB7783V2.gsb, ATS77 <==> NAD83(CSRS)
    Originator:  Service New Brunswick - GeoNB.
    KilletSoft:  Download NB7783V2
11. Canada (Nova Scotia): NS7783V2.gsb, ATS77 <==> NAD83(CSRS98)
    Originator:  Geographical Information Sciences Centre.
    KilletSoft:  Download NS7783V2
12. Canada (Nova Scotia): GS7783.gsb, ATS77 <==> NAD83
    Originator:  Geographical Information Sciences Centre.
    KilletSoft:  Download GS7783
13. Canada (Ontario): MAY76V20.gsb, NAD27(1976) <==> NAD83(ORIG)
    Originator:  Ontario Ministry of Natural Resources.
    KilletSoft:  Download Registration Address
14. Canada (Ontario): ON27CSV1.gsb, NAD27(1974) <==> NAD83(CSRS)
    Originator:  Ontario Ministry of Natural Resources.
    KilletSoft:  Download Registration Address
15. Canada (Ontario): ON27CSV1.gsb, NAD27(1976) <==> NAD83(CSRS)
    Originator:  Ontario Ministry of Natural Resources.
    KilletSoft:  Download Registration Address
16. Canada (Ontario): ON83CSV1.gsb, NAD83(ORIG) <==> NAD83(CSRS)
    Originator:  Ontario Ministry of Natural Resources.
    KilletSoft:  Download Registration Address
17. Canada (Prince Edward Island): PE7783V2.gsb, ATS77 <==> NAD83(CSRS98)
    Originator:  PEI Department of Transportation and Infrastructure Renewal.
    KilletSoft:  Download PE7783V2
18. Canada (Quebec): CQ77NA83.gsb (Esri CGQ77-83), NAD27(CGQ77) <==> NAD83
    Originator:  Géoboutique Québec, Ministère des Ressources naturelles.
    KilletSoft:  Download CQ77NA83
19. Canada (Quebec): CQ77CSRS.gsb (Esri CGQ77-98), NAD27(CGQ77) <==> NAD83(CSRS)
    Originator:  Géoboutique Québec, Ministère des Ressources naturelles.
    KilletSoft:  Download CQ77CSRS
20. Canada (Quebec): NA27NA83.gsb (Esri QUE27-83), NAD27 <==> NAD83
    Originator:  Géoboutique Québec, Ministère des Ressources naturelles.
    KilletSoft:  Download NA27NA83
21. Canada (Quebec): NA27CSRS.gsb (Esri QUE27-98), NAD27 <==> NAD83(CSRS)
    Originator:  Géoboutique Québec, Ministère des Ressources naturelles.
    KilletSoft:  Download NA27CSRS
22. Canada (Quebec): NA83CSRS.gsb (Esri NAS83-98), NAD83 <==> NAD83(CSRS)
    Originator:  Géoboutique Québec, Ministère des Ressources naturelles.
    KilletSoft:  Download NA83CSRS
23. Canada (Saskatchewan): SK27-83.gsb, NAD27 <==> NAD83
    Originator:  GeoSask - Saskatchewans Service for Maps and Land Information.
    KilletSoft:  Download SK27-83
24. Canada (Saskatchewan): SK27-98.gsb, NAD27 <==> NAD83(CSRS98)
    Originator:  GeoSask - Saskatchewans Service for Maps and Land Information.
    KilletSoft:  Download SK27-98
25. Canada (Saskatchewan): SK83-98.gsb, NAD83 <==> NAD83(CSRS98)
    Originator:  GeoSask - Saskatchewans Service for Maps and Land Information.
    KilletSoft:  Download SK83-98

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