Killet GeoSoftware Ing.-GbR - short: KilletSoft - is a software company, which was established in the year 1991. The society is divided into the ranges "Geodetic Standard Software", "Development Tools for Geoinformatics" and "International Geodata". The focal trades of the companies supplied by KilletSoft are consulting engineers, GIS developers, Internet marketing, public utilities, logistics, telecommunications, security and public services.
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TRANSDATpro - Geodetic Coordinate Transformations
Download of the suppoeted NTv2 / HARN grid files

Coordinate Transformation

Worldwide collection of NTv2 files

In the context of a training measure we have created a worldwide collection of most official NTv2 links.

Click here for the link_in collection of NTv2 files with the possibility for direct download.

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 TRANSDATpro supported NTv2 and HARN gridfiles can be downloaded from this website.

Support of the NTv2 standard by the Geosoftware TRANSDATpro

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 link_in Westnetz GmbH.
  2. Quality analysis with test data of the link_in Survey Authorities of Germany.
    Download the link_dl test log.
KilletSoft News In order that you are always well informed about our company, we write actual news, current information and special offers here into this column.
KilletSoft Logo NTv2Creator
For the first time, experts in geodesy and surveying have access to an economical standard software that allows them to generate accurate NTv2 solutions by themselves.
link_in Read the Press Release...
KilletSoft Logo NTv2Creator
After long development time we are pleased to present the program NTv2Creator for modelling NTv2 files from identical points.
link_in Program description...
KilletSoft Logo Plus Code / Open Location Code
Display Formats of Coordinates in Plus Code / Open Location Code (OLC).
link_in Read the Worksheet...
KilletSoft Logo is member of
VDV Logo
KilletSoft Logo NTv2 collection
KilletSoft has brought together NTv2 files as a worldwide collection on a central website and linked for the direct download.
link_in Read the Press Release...
link_in To the NTv2 collection...
KilletSoft Logo CRS in Germany
Traditional and modern Coordinate Reference Systems (CRS) as example of Germany.
link_in Read the Worksheet...
KilletSoft Logo BY-KanU
Following Baden-Wuerttemberg with its close-meshed NTv2 grid file BWTA2017, the federal state of Bavaria as well has completed extra high-resolution NTv2 files for the transformation of spatial data in real estate cadastres to UTM/ETRS89.
link_in Read the Press Release...
KilletSoft Logo NTv2 Toolbox
Geosoftware with Tools for analyzing and processing of NTv2 files.
link_in Read the Worksheet...
KilletSoft Logo Polygonal Validity Scopes
Geosoftware for inserting area boundaries as Polygonal Validity Scopes in NTv2 files.
link_in Read the Worksheet...
KilletSoft Logo GDA2020
The new geodetic Reference System GDA2020 of Australia is supported by TRANSDAT and GeoDLL now. link_in Read the Press Release...
link_in View the list of CRS...
KilletSoft Logo Google Maps / OpenStreetMap
Usage of Geodata for Navigation in free Map Services.
link_in Read the Worksheet...
KilletSoft Logo Translators wanted!
The programs TRANSDAT, SEVENPAR, NTv2Creator, NTv2Poly and NTv2Tools support language files for the programs interface. Since the language dependent texts are managed in external files, link_in new languages can be added at any time by creating new language files. Everybody who is interested can translate a new language file into his native language for himself and all users.
Author: Dipl.-Ing. Fred Killet
Page name: p_trdn_e.htm
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Period: since Januar 1, 2020