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

KilletSoft provides solutions for problems with large NTv2 files in GIS and Geosoftware.
With a new program and new features of GeoDLL it is possible to copy from very large NTv2 files, such as BY_KanU and BWTA2017, only the required areas into smaller NTv2 files.
April 12, 2018
Dipl.-Ing. Fred Killet - Killet GeoSoftware Ing.-GbR - Escheln 28a - 47906 Kempen, Germany
link_in Download Press Release as MS WORD file

Logo For Bavaria and Baden-Wurttemberg (Germany) NTv2 approaches already exist with very high accuracy in the centimeter range, which are suitable for the transformation of spatial thematic data of the real estate cadastre. The high point density required for this results in a high count of meshes in the NTv2 files. As a result, the file sizes of the NTv2 grid files for the two large-area Federal States are enormous. For example, the NTv2 file BY_KanU_Bayern-gesamt.gsb, just in development by the Bavarian Surveying Administration, has a volume of more than 3.18 gigabytes. The productive file BWTA2017 of the Federal State of Baden-Wurttemberg has still a size of 374 megabytes.
The use of such large NTv2 files is a new trend that developers of geodetic software and GIS could not anticipate. Thus it is not surprising that BY-KanU by a lot of software products can not be used. Here, the file size exceeds the by "long integer" addressable file range of about 2.2 gigabytes. Often the grids of the NTv2 file are held in memory due to the calculation speed. However, this is usually not possible with such large grids as contained in BY-KanU and BWTA2017. These problems can be eliminated only with a great development effort and require a certain changeover time.
Copy of an NTv2 area KilletSoft has developed a tool as part of its GeoDLL, which allows to copy out a required area from a large NTv2 file by defined corner coordinates. The separated area is placed in a new NTv2 file that is much smaller than the original. Thereby all grids whose area intersects the given area are taken into account. The newly generated NTv2 file now can be used as usual in all geodetic programs and GIS. If, for example, only the Munich area is needed for coordinate transformation using NTv2, with the KilletSoft tool it can be cut out from the Bavarian NTv2 file BY-KanU by defining the corner coordinates of the area of Munich. In a test, conducted by KilletSoft, the resulting NTv2 file only had the 120th part of the original file size.
Beside NTv2 coordinate transformations and datum shifts GeoDLL contains several functions for manipulating NTv2 files:

  1. convntvascii2bin() - Converts an NTv2 ASCII file to a binary file
  2. convntvbin2ascii() - Converts an NTv2 binary file to a ASCII file
  3. convntvbin2area() - Copies an area from an NTv2 grid file to new file
  4. getntvheader() - Determines the header parameters of an NTv2 file
  5. getntvgridheader() - Determines the header parameters of all NTv2 grids

In addition to NTv2-based coordinate transformation, these features as of now can be placed into your own software products using KilletSoft's GeoDLL. Shortly, another function will be available to customize NTv2 files with their Polygonal Validity Scope (see link_in work sheet dated Dec., 2015). For this a shape file with the outer borders of the validity scope area will be used. KilletSoft will soon develop a computer program that will apply the functions mentioned here to NTv2 files. Still in this year, KilletSoft will introduce another program that can generate own NTv2 files from identical points in two different frames of reference.

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: t_1804_e.htm
Page views: 113
Period: since Januar 1, 2024