GEOTRANSFORMER

Basic Information

Name of Program

GEOTRANSFORMER

Version-Date

December 2013

Description-Date

January 2014

Catchwords

coordinate transformation
coordinate system
Gauss-Krueger
European Terrestrial Reference System 1989 (ETRS89)
world geodetic system 1984 (WGS84)
european datum 1950 (ED50)
Potsdam datum (Bessel 1841)
Krassovski ellipsoid
NTv2 method
GNTRANS-WSV
BETA2007
Rijksdriehoeksmeting (RD, coordinate system of the netherlands)
universal transverse mercator (UTM)

Short Description of Functionality

This program transforms coordinates between different coordinate systems. Currently implemented coordinate systems are:

• Gauß-Krüger (stripe 2 to 5)
• spherical coordinates (longitude, latitude)
• Universal Transverse Mercator (UTM)
• Rijksdatum (Netherlands)
• local metric central projection

Currently implemented geodetic 7-parameter transformations:

• European Terrestrial Reference System 1989 (ETRS89)
• World Geodetic System 1984 (WGS84)
• European Datum 1950 (ED50)
• Federal Intstitute for cartography und geodesy, standard parameter
• Federal Intstitute for cartography und geodesy, latitudes >52,3 degrees N
• BAW C. Maushake,
• Krassovsky standard (Wikipedia)
• Krassovsky (WSA Stralsund)
• Federal Intstitute for cartography und geodesy, latitudes between 50,3 degrees N and 52,3 degrees N
• Federal Intstitute for cartography und geodesy, latitudes <50,3 Grad N

Additionally the BETA2007 based NTv2 grid shift method is provided for datum transformation of DHDN90 to ETRS89 and back.

Input-Files

1. triangulated mesh (file type TICAD,gitter05.dat/bin)
2. digitized polylines (file type digi.gkk) or
3. digitized polylines (file type insel.dat) or
4. polygon file (file type poly.dat) or
5. polygone file to protect edges of a grid (file type nodes.save) oder
6. plot frames (file type frames.dat, center and size, or
7. description of boundary cells (file type rgz.dat) or
8. ASCII triple data, file with soundings (file type geom.dat) or
9. time series at single station (file type boewrt.dat) or
10. position description (file type geopos.dat) or
11. triangulated UNTRIM-VC mesh (file type untrim_grid.dat, version Vincenzo Casulli) or
12. grid of the numerical method DELFT3D (file type delft3d.grd) or
13. triangulated UNTRIM-BAW mesh (file type untrim_grid.dat, BAW version) or
14. system file for specific locations (file type location_grid.dat) or
15. file IPDS to initialize models area wide (file type ipds.dat).

Output-Files

1. triangulated mesh (file type TICAD,gitter05.dat/bin)
2. digitized polylines (file type digi.gkk) or
3. digitized polylines (file type insel.dat) or
4. polygon file (file type poly.dat) or
5. polygone file to protect edges of a grid (file type nodes.save) oder
6. plot frames (file type frames.dat, center and size, or
7. description of boundary cells (file type rgz.dat) or
8. ASCII triple data, file with soundings (file type geom.dat) or
9. time series at single station (file type boewrt.dat) or
10. position description (file type geopos.dat) or
11. triangulated UNTRIM-VC mesh (file type untrim_grid.dat, version Vincenzo Casulli) or
12. grid of the numerical method DELFT3D (file type delft3d.grd) or
13. triangulated UNTRIM-BAW mesh (file type untrim_grid.dat, BAW version) or
14. system file for specific locations (file type location_grid.dat) or
15. file IPDS to initialize models area wide (file type ipds.dat).

Methodology

• Input and output list are opened at the same time. Every coordinate point will be read, transformed and written on the output list immediately. So the size of the input file is unlimited.
• The formatting of decimal coordinates depends on the actual projection of coordinates (geographic or map coordinates). File type 08 (ASCII triple data) allows user defined Output Format via Environment variable GEOMFMT.
• The program first calculates spherical coordinates (WGS84) from input projected coordiantes. Then the new geodetic datum and projection is applied. In the datum cases DHDN or STN in input and/or output data, the NTv2 method with grid shift file *.gsb is provided as Default alternative.
• on input in files of type 08 (geom.dat) the separators semicolon, comma and colon are allowed.
• on input in files of type 09 (boewrt.dat) or 10 (geopos.dat) the coordinate reference system is first changed to the input system, if an internal CRS Information is available. In files of type 02 (digi.gkk) and 08 (geom.dat) the( well known!) coordinate reference system of the input files can be specified through the comment "C CRS=#####" at the beginning of the file Anfang der Datei. "#####" here is an EPSG code which is supported by libgeodesy. In this case also a Transformation to the input system is done first. The input system must have a valid EPSG code too.
• To all ASCII formats which are not NAMELIST based, a file header with the current coordinate information is added as comments.

EPSG codes wich are supported by libgeodesy are:

• Gauss-Krueger 3 degree / DHDN: EPSG 31466-31469 (
• Gauss-Krueger 3 degree / STN : EPSG 02398-02399
• UTM / ETRS89  : EPSG 25831-25833
• UTM / ED50  : EPSG 23031-23033
• RD Amersfoort New  : EPSG 28992
• Geographic ETRS89  : EPSG 4258
• Geographic WGS84  : EPSG 4326
• Geographic ED 50  : EPSG 4230

Program(s) to run before this Program

all programs wich use above listed file formats

Program(s) to run after this Program

all programs wich use above listed file formats

Additional Information

Language

Fortran95

Additional software

NTv2 grids dhdn_to_etrs89_wsv_v1.gsb, stn_to_etrs89_wsv_v1.gsb and BETA2007.gsb

Original Version

G. Seiß (main program, file I/O, libgeodesy)

Maintenance

G. Seiß

Documentation/Literature

interactive dialog, self explaining
$PROGHOME/examples/geotransformer
Junkins, D.R. and Farley, S.A. (1995) National Transformation Version 2 Users Guide, Geodetic Survey Division Geomatics Canada

---

back to Program Descriptions

---

Overview