Killet Software 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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NTv2 Tools

The group "NTv2 Tools" contains functions that allows the manipulation and data retrieval from NTv2 ASCII grid files and NTv2 binary files.
NTv2 files are either in ASCII format or in binary format. With the functions convntvascii2bin() and convntvbin2ascii() can be converted between the two file formats.
There are some very large NTv2 binary files that are larger than the 2.15 gigabytes addressable with the "long int" C variable type. For example, the Bavarian NTv2 binary file BY_KanU_Bayern-gesamt.gsb has a size of about 3.5 gigabytes. Unlike the Software GeoDLL and TRANSDAT by KilletSoft, many geodetic programs and GIS can not handle such large NTv2 files. With the function convntvbin2area() it is possible to copy an area defined by a coordinate section from a NTv2 binary file into a new binary file. All subgrids of the binary file, which intersects the coordinate section, are taken into account. The new binary file created in this way is smaller and can be used with any geodetic software and GIS.
An NTv2 file contains one or more quasi-rectangular coordinate grids which are defined in the NTv2 headers. Instead of a rectangular area only an embedded polygonal area should and must be covered, for example, a state territory within the country borders. The function convntvbin2polyvalid() realizes the Polygonal Validity Scope in NTv2 files. For that purpose the polygonal scope is realized with a shape file that contains the outlines of the scope as polygons. Coordinates outside the scope then can be excluded from calculations or be acknowledged by a warning using the KilletSoft products TRANSDAT and GeoDLL and a lot of GIS software developed by companies which supports Polygonal Validity Scopes.
Further functions of this group determine the header data of the of NTv2 grid files or their subgrids.

Download of the NTv2 gridfiles in binary format

The NTv2 grid files supported by the program TRANSDAT and the function librariy GeoDLL you can download  here from the KilletSoft website!

Characteristics of the group "NTv2 Tools"

  1. ASCII gridfiles (.gsa) and binary gridfiles (.gsb)
  2. Conversion of ASCII gridfiles to binary gridfiles
  3. Conversion of binary grid files to ASCII grid files
  4. Copy of NTv2 grid file areas to new binary files
  5. Supplement of a NTv2 binary file with Polygonal Validity Scopes
  6. Determining the parameters of a NTv2 gridfile
  7. Download of many NTv2 files from the KilletSoft website
  8. Links to NTv2 providers on the KilletSoft website
  9. HARN grid files of the U.S. supported as equivalent NTv2 grid files
  10. Free use of some NTv2 files, which otherwise are available for a fee
  11. Access to NTv2 files, which are specially licensed for KilletSoft

Functions of the group "NTv2 Tools"

  1. Function convntvascii2bin() - Convert a NTv2 ASCII file to a binary file
  2. Function convntvbin2ascii() - Convert a NTv2 binary file to an ASCII file
  3. Function convntvbin2area() - Copies an area of a NTv2 grid file to a new binary file
  4. Function convntvbin2polyvalid() - Supplement of NTv2 binary files with Polygonal Validity Scopes
  5. Function getntvgridcount() - Get count of subgrids contained in a NTv2 file
  6. Function getntvgridheader() - Get header parameter of a NTv2 subgrid
  7. Function getntvheader() - Get header parameter of a NTv2 file

Ausführliche Funktionsbeschreibungen

Detailed descriptions of all geodetic functions of this function group you find here in the online manual!

KilletSoft News In order that you always are well informed about our company, we write actual news, current information and special offers here into this column.

KilletSoft Logo PolyGonal Validity Scopes
The new program NTv2Poly complements NTv2 files with Polygonal Validity Scopes that are taken from an outline shapefile.  Read the Description...

KilletSoft Logo Very big NTv2 files
Solutions for problems with large NTv2 files in GIS and Geosoftware  Read the Press Release...

KilletSoft Logo GDA2020
The new geodetic Reference System GDA2020 of Australia is supported by TRANSDAT and GeoDLL now.  Read the Press Release...
 View the list of CRS...

KilletSoft Logo BWTA2017
Baden-Wuerttemberg has completed the close-meshed NTv2 grid file for the transformation of geodata in real estate cadastres to UTM/ETRS89.
 Read the Press Release...

KilletSoft Logo GoogleMaps / OpenStreetMap
KilletSoft converts Geodata for Navigation in free Map Services.
 Read the White Paper...

KilletSoft Logo Quality Analysis
Practice oriented Accuracy Verification of the Software TRANSDAT and GeoDLL with an extremely structured NTv2 grid file.
 Read the White Paper...

KilletSoft Logo Innovation Award 2016
Award 2016 KilletSoft's geodetic software has won for the second year in succession the Innovation Award from the Initiative Small and Medium Enterprises.
 Certificate TRANSDAT...
 Certificate ORTWIN...
 Read the Press Release...

KilletSoft Logo GeoDLL / TRANSDAT
Proposal for using Polygonal Validity Scopes in NTv2 grid files.
 Read the White Paper...

KilletSoft Logo NTv2 Hamburg
Highly accurate NTv2 file of the Federal State of Hamburg free of charge for TRANSDAT and GeoDLL users.
 Download the NTv2 file ...
 Read the Press Release...

KilletSoft Logo GeoDLL
GeoDLL provides Time Zone Calculations with aspect to Maritime Territorial Limits.
 Read the Press Release...

KilletSoft Logo TRANSDAT / GeoDLL
The program and the DLL now support all HARN / HPGN Reference Systems of the United States.
 Read more...

KilletSoft Logo Translators wanted!
The programs TRANSDAT and SEVENPAR 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.