Group Coordinate Transfomations

The group "Coordinate Transformations" contains functions for the realization of Coordinate Transformations and Reference System Transitions.

GeoDLL performs Coordinate Transformations fast and with high accuracy. For this purpose the DLL supports thousands of worldwide Coordinate Systems, geodetic Reference Systems, Reference System Transitions (geodetic datum shifts) and Meridian Strip Transitions. Additional the software supports User-defined Systems, 2D/3D transformations, Extra Parameters like Meridian Convergence and Origin Center Meridian, INSPIRE, NTv2, HARN, EPSG, GPS, Continental Drift and much more.

Characteristics of the function group

•	Coordinate Transformation

•	Reference System Transition

•	Meridian Strip Transition

•	2D and 3D Coordinate Transformation

•	Helmert and Molodensky Reference System Transition

•	Helmert transitions with forward and backward transformations

•	NTv2 and HARN grid file support

•	Numeric and alphanumeric coordinates

•	Geographic and Cartesian coordinates

•	Many projections (also rarely used ones)

•	Thousands of predefined systems (see below "Coordinate Transformation")

•	Use of EPSG codes

•	Use of Measurement Units

•	Calculation of Meridian Convergence and Origin Center Meridian

•	Calculation of the Geographical Point Coordinate

•	Calculation of more extra parameters

•	Coordinate System range validity check

"Coordinate Transformations" function group

Function coordtrans() - 2D Coordinate transform. / Reference System Transition, num. / alphanum. (char**)

Function coordtrans2() - 2D Coordinate transform. / Reference System Transition, num. / alphanum. (char*)

Function coordtrans3() - 2D Coordinate Transformation / Reference System Transition, only numeric, notations

Function coordtrans4() - 2D Coordinate Transformation / Reference System Transition, only numeric, no notations

Function coordtransex() - 2D Coordinate transform. / Reference System Transition, reduced eastings

Function coordtrans3d() - 3D Coordinate transf. / Reference System Transition, num. / alphanum. (char**)

Function coordtrans3d2() - 3D Coordinate transf. / Reference System Transition, num. / alphanum. (char*)

Function coordtrans3d3() - 3D Coordinate Transformation / Reference System Transition, only numeric

Function coordtrans3d4() - 3D Coordinate Transformation / Reference System Transition, only numeric, no notations

Function coordtrans3dex() - 3D Coordinate transform. / Reference System Transition, reduced eastings

Function coordtransepsg() - EPSG code Coordinate Transformation / Reference System Transition

Function meritrans() - Meridian strip change with GK und UTM coordinates

Function setcoordarea() - Coordinate System range validity check on / off

Function setcalcextra() - Calculation of extra parameters on / off

Function coordcalcextra() - Calculation of extra parameters during coordinate transformations

Function coordcalcextraind() - Calculation of extra parameters independent from coordinate transformations