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.
GeoDLL - Geodetic Development Kit
Download of the supported NTv2 / HARN grid files
GeoDLL - Function Groups
At present 2 to 7 cm per year
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 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.
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:
Quality analysis by the network operator Westnetz GmbH.
Quality analysis with test data of the Survey Authorities of Germany.
Download the test log.
In order that you are always well informed about our company, we write actual news, current information and special offers here into this column.
is member of
CRS in Germany
Traditional and modern Coordinate Reference Systems (CRS) as example of Germany.
Read the Worksheet...
"Geodata Germany" has been updated on the data conditions of January 1st, 2020.
The database contains Towns and Municipalities, Town Districts, Coordinates, Postal Codes, Dialling Codes, Wind and Snow loads, Solar irradiation etc.
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.
Read the Press Release...
Polygonal Validity Scopes
Geosoftware for inserting area boundaries as Polygonal Validity Scopes in NTv2 files.
Read the Worksheet...
Practice oriented Accuracy Verification of the Software TRANSDAT and GeoDLL with an extremely structured NTv2 grid file.
Read the Worksheet...
The programs TRANSDAT, SEVENPAR, NTv2Poly and NTv2Tools support language files for the programs interface.
Since the language dependent texts are managed in external files, 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
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Period: since Januar 1, 2020