GeoDLL - Geodetic Software Development Kit for coordinate transformations

GeoDLL supports the development of geodetic software on various platforms by providing geodetic functions. GeoDLL contains precise calculations on the themes 2D and 3D coordinate transformation, geodetic datum shift and reference system converting, meridian strip changing, user defined coordinate and reference systems, distance calculations, Digital Elevation Model, NTv2 handling and BeTA2007 support, Direct / Inverse solutions, map function and geodetic converting functions. The most important application of GeoDLL is to include professional coordinate transformations in own programs. These coordinate and reference systems are supported: 1. The current and many historical coordinate and reference systems of all countries of the European Union (EU) including the eastern extensions and the systems of the European non-EU countries. 2. The European ETRS89 systems forced by INSPIRE with respect to the continental drift. 3 .The US and Canadian State Plane Coordinate Systems (SPCS) and other systems of the North American continent. 4. Many coordinate and reference systems of the countries of all continents and the world-wide used coordinate and reference systems. 5. World-wide NTv2 grid file supported coordinate transformations. 6. The coordinate and reference systems of the old and new German Federal States, the 40 Prussian Soldner Land Registers, the German 'Lagestatus', special reference systems of the German Federal States and BeTA2007. 7. User defined coordinate systems, reference systems and earth ellipsoids. GeoDLL comes with extensive documentation and is supplied as DLL file or as C++ source code for 32bit and 64bit architectures. The DLL works with most programming languages and it can be used with Microsoft Office programs. The DLL is written in C++ and was developed with Microsoft Visual Studio 2010. Thus very fast performance, compact code and high stability are assured. The functions of GeoDLL are prepared for multithreading.

Changes: New NTv2 systems for German Federal States Berlin, Bavaria and Mecklenburg. Digital signature for secure installation of the DLL. New CRS for Czechia, Slovakia, Albania, Cyprus and Switzerland. ITRS epochs of EUREF GPS Campaign ITRF2008. Support of Polygonal Validity Scopes in NTv2 files.

Minimum requirements: Pentium, 20 MB free Disk

Operating system: WinXP,WinVista,WinVista x64,Win7 x32,Win7 x64,Win2000,WinOther,Windows2000,Windows2003,WinServer,Windows Vista Ultimate,Windows Vista Ultimate x64,WinMobile,WinME,WinNT 3.x,WinNT 4.x,Windows Tablet PC Edition 2005,Windows Media Center Edition 2005,Windows Vista Starter,Windows Vista Home Basic,Windows Vista Home Premium,Windows Vista Business,Windows Vista Enterprise,Windows Vista Home Basic x64,Windows Vista Home Premium x64,Windows Vista Business x64,Windows Vista Enterprise x64,Windows 10,Windows 8,Windows RT,Windows Server 2012

Program URL:

GeoDLL screenshot


The author presents a simple method for realizing polygonal validity scopes in NTv2 files. Thereby the structure of the NTv2 file remains unchanged.

Special permissions

Hereby C. Killet Softwareentwickung GbR permits to distribute their software GeoDLL exclusive as shareware version on data media and in the online media up to revocation. We guarantee to possess all rights on the software. We exempt the legal distributor of our software from requirements third. With the revocation of the permission all projects in work with our software may be led to the end.


The license models described here require only a unique payment. No additional payments are raised as a function of the number of customer installations or on the service life of the license. The unlock code provides you with the right of using the functions of the unlocked group. Several licensing models are available: Single license: Functions of the licensed group can be called from a single commercial software application including the application updates and distributed to any number of clients or can be used in a single Internet application.

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