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 "German 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.
 •  Print page content  •  link_in Company •  link_in Contact •  link_in Imprint
Deutsch English

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 grid files 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 grid files

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 grid files 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 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 Geodata Germany
All databases has been updated to the data conditions of January 1st, 2024. The georeferenced databases contain all German towns, municipalities and urban districts, coordinates, postal codes, dialling codes, administrative units, nature areas, landscapes, travel areas, wind and snow loads, solar irradiation, cartographies info etc.
link_in
KilletSoft Logo New work sheet
Modeling an NTv2 file under the aspect of economic efficiency.
link_in Read the work sheet...
KilletSoft Logo New work sheet
Display Formats of UTM Coordinates.
Display formats, calculation methods and the historical background of the UTM coordinate system.
Third revised edition of the popular technical article.
link_in Read the work sheet...
KilletSoft Logo New work sheet
What actually is a Coordinate Reference System?
Explanation of the Coordinate Reference System with the components Coordinate System, Reference System, Reference Definition and Reference Frame.
Second revised edition.
link_in Read the work sheet...
KilletSoft Logo Illegal software versions
The illegal use of our software got out of control!
link_in Read our Info...
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 is member of
VDV Logo
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_gdln_e.htm
Page views: 221
Period: since Januar 1, 2024