GNU Gama

GNU Gama is a project dedicated to adjustment of geodetic networks. It is intended for use with traditional geodetic surveyings which are still used and needed in special measurements (e.g., underground or high precision engineering measurements) where the Global Positioning System (GPS) cannot be used.

Adjustment in local Cartesian coordinate systems is fully supported by a command-line program gama-local that adjusts geodetic (free) networks of observed distances, directions, angles, height differences, 3D vectors and observed coordinates (coordinates with given variance-covariance matrix). Adjustment in global coordinate systems is supported only partly as a gama-g3 program.

Requirements

For parsing XML documents Gama uses XML parser expat, originally written by James Clark. If for any reason expat library is not installed on your system, Gama still can be compiled and build with old version 1.1 of expat, that is distributed with Gama (make dep-expat-1.1; make). XML parser expat is not a part of GNU Gama, but is used with GNU Gama.

GNU Gama requires adjustment input data described in XML format, see documentation for details.

Download

GNU Gama can be found in the subdirectory /gnu/gama/ on any of GNU FTP server mirrors http://ftpmirror.gnu.org/gama or checked-out from the GIT server https://git.savannah.gnu.org/cgit/gama.git.

To get an anonymous read-only access to the GIT repository for the latest GNU Gama source, issue the following command

git clone git://git.sv.gnu.org/gama.git

If you are interested in an alpha version of Qt based GUI, build the application following the six steps given below.

git clone git://git.sv.gnu.org/gama/qt.git
cd  qt/gama-lib/
git clone git://git.sv.gnu.org/gama.git
cd  ../..
qmake
make
gama-q2/gama-q2 &

The collection of sample networks is available separetely. To checkout the gama-local examples from GIT use the command

git clone git://git.sv.gnu.org/gama/examples.git

GNU Gama files in GIT repository can also be downloaded and browsed in directories gama, qt and examples. For example the master tar ball can be downloaded from

http://git.savannah.gnu.org/cgit/gama.git/commit/

Binary builds for Windows

Command line executables for Windows are available from https://sourceforge.net/projects/gnu-gama-builds/.
Binary builds of Qt based GUI gama-q2 are available from https://sourceforge.net/projects/gnu-gama-q2.

Documentation

A manual is available online in several formats.

Related projects

GeoEasy surveying calculation, network adjustment, digital terrain models, regression calculation. See also the article by Zoltan Siki GeoEasy an open source project for surveying calculations, DOI: https://doi.org/10.14311/gi.17.2.1

Contact us

GNU Gama has two moderated mailing lists:

<info-gama@gnu.org> for announcements and discussion about GNU Gama;
<bug-gama@gnu.org> to which you should send a mail whenever you find bugs, and have suggestions, ideas or questions related to GNU Gama. Whenever you report a bug, please include enough information so that we can understand what happened and even reproduce your problem in our machines. Excessive information is always better than no information.

If you prefer, you can always directly contact Aleš Čepek.