About GNU Gama package is 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 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. https://www.gnu.org/software/gama/ Here are the compressed sources and a GPG detached signature[*]: https://ftp.gnu.org/gnu/gama/gama-2.18.tar.gz https://ftp.gnu.org/gnu/gama/gama-2.18.tar.gz.sig Use a mirror for higher download bandwidth: https://ftpmirror.gnu.org/gama/gama-2.18.tar.gz https://ftpmirror.gnu.org/gama/gama-2.18.tar.gz.sig Here are the SHA1 and SHA256 checksums: 94cf28c7e0ef451a9f30b7900816548857e53c3c gama-2.18.tar.gz XNi7SmeE4zk81kAHWtIWL7Z1jnTqeAe71y2WuMvgXQ0 gama-2.18.tar.gz The SHA256 checksum is base64 encoded, instead of the hexadecimal encoding that most checksum tools default to. [*] Use a .sig file to verify that the corresponding file (without the .sig suffix) is intact. First, be sure to download both the .sig file and the corresponding tarball. Then, run a command like this: gpg --verify gama-2.18.tar.gz.sig If that command fails because you don't have the required public key, or that public key has expired, try the following commands to update or refresh it, and then rerun the 'gpg --verify' command. gpg --recv-keys 1b77fc09 NEWS Changes in release 2.18 (2022-04-09) New conversion class K2gkf (lib/krumm) with accompanying program krumm2gama-local and the testing suite for converting input data format used in the text book "Geodetic Network Adjustment Examples" by Friedhelm Krumm, Geodätisches Institut Universität Stuttgart, 2020. Not all input data in Krumm Format can be converted to GNU Gama, i.e. to the adjustment program gama-local input XML: * scale factor is not implemented in gama-local adjustment * gama-local does not enable fixing only x coordinate (or y coordinate) for 2D free network to remove singularity. This kind of regularization has very little practical meaning. Technically it would be possible to enable this feature in gama-local, but it is questionable if the outcome would not enable more confusion than possible outcome. Adustment should not be dependent on the coordinate system used. * gama-local does not deduce that an azimuth to the unknown point P can be combined with some angle pointing to the P to create a new feigned azimuth. This is an interesting feature which may be implemented in some future version, namely in the gama-local stage of computing approximate coordinates. * nonlinear conditions are not implemented in gama-local * BLH coordinates are not supported in gama-local
