GEOTRANSFORMER

Basic Information

Name of Program

GEOTRANSFORMER

Version-Date

February 2013

Description-Date

February 2013

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 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)
• The program first calculates spherical coordinates (WGS84) from input projected coordiantes. Then the new geodetic datum and projection is applied. For datum transformation from DHDN to ETRS89 and back, alternatively the NTv2 method with grid shift file BETA2007.gsb is provided.
• To all ASCII formats which are not NAMELIST based, a file header with the current coordinate information is added as comments.

Program(s) to run before this Program

all programs wich use above file formats

Program(s) to run after this Program

all programs wich use above file formats

Additional Information

Language

Fortran90

Additional software

NTv2 grid BETA2007.gsb

Original Version

G. Seiß (main program, file I/O)

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

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