2013-08-16  Patrick Eriksson  <patrick.eriksson@chalmers.se>

            * arts-2-1-736

            * src/ppath.cc (do_gridcell_2d_byltest): A 2D version of the
            corresponding 3D one. Not yet active, fails at least for negative
            za.



git-svn-id: https://www.sat.ltu.se/svn/rt/arts/trunk@8600 aaf1aab0-4228-0410-ad68-8dceda47f409
2013-08-17  Patrick Eriksson  <patrick.eriksson@chalmers.se>

            * arts-2-1-737

            * 2D ray tracing now following the approached already used for 3D.
            Less elegant but seems needed to get away from a constant tuning
            of settings to handlle the numerical problems. 

            * src/ppath.cc (ppath_step_geom_2d): Now calling
            do_gridcell_2d_byltest. If you run into problems with the new 2D
            ppath calculations, just change if(0) to if(1) on line 3311.

            (raytrace_2d_linear_basic): As above, including a if-statement to
            switch back to old code.

            * src/geodetic.cc (cart2pol, cart2poslos): Changes to get the
            functions to work with negative zenith angles.



git-svn-id: https://www.sat.ltu.se/svn/rt/arts/trunk@8601 aaf1aab0-4228-0410-ad68-8dceda47f409