Description

GDAL/OGR is widely used in open source and closed source applications. The OGRSpatialReference in conjunction with the PROJ.4 library is quasi standard for 2D coordinate transformation. In the GSoC 2013 project, the functionality was extended to support 3D transformations, especially focussing the transition from ellipsoidal to othometric height systems via geoid undulation models, and additionally considering anomalies of the national height systems via height correction models. Building on the results achieved so far, the goal is to implement and test a rigorous 3D transformation chain for geodetic datum transitions based on the NTv2 grid shift approach.

Benefit for the Student

Gain a deep understanding of world- and countrywide coordinate systems and their transformation. Conceive definition issues of horizontal and height systems on the earth. Being part of a small but widely used open source project.

Benefit for the Project

Set an appropriate standard for 3D transformations for subsequent projects.

Requirements

General understanding of geocentric and geographic coordinate systems, map projection and coordinate transformation is essential. Solid skills in C/C++ and understanding of existing code are necessary. Source code version management experiences (git, github) are welcome.

Mentors

Gottfried Mandlburger, Johannes Otepka

Contact

Mentors are regularly around in our GSoC IRC channel #TU-CSE-SoC at irc.freenode.net. You can also reach us via the mailinglist – send an email to This email address is being protected from spambots. You need JavaScript enabled to view it. using the prefix [GDAL/OGR] (a subscription is required).

More info

http://www.iue.tuwien.ac.at/cse/wiki/doku.php?id=wiki:projects:gdal-vertical-datums
http://www.mgs.gov.on.ca/stdprodconsume/groups/content/@mgs/@iandit/documents/resourcelist/stel02_047447.pdf
ftp://ftp.gouv.nc/sig/ESRI/ntv2/NTv2DeveloperGuide.pdf?
http://www.iue.tuwien.ac.at/cse/wiki2014/doku.php?id=3d_grid_shift_transformation