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1) In the Lagranto folder you shoud have the following files and directories:rossby.ethz.ch[229]: ls -ldrwxr-xr-x 3 michaesp wheel 2048 Apr 5 13:31 bin/drwxr-xr-x 3 michaesp wheel 1024 Apr 5 13:31 caltra/drwxr-xr-x 7 michaesp wheel 1024 Apr 4 16:57 docu/drwxr-xr-x 5 michaesp wheel 1024 Apr 4 16:57 figure/drwxr-xr-x 3 michaesp wheel 4096 Apr 5 13:31 goodies/-rwxr-xr-x 1 michaesp wheel 8738 Apr 5 12:01 install.csh*drwxr-xr-x 3 michaesp wheel 1024 Apr 5 13:31 lib/drwxr-xr-x 3 michaesp wheel 1024 Apr 5 13:31 select/drwxr-xr-x 3 michaesp wheel 1024 Apr 5 13:31 trace/2) If you haven't done so, you should then install Lagranto with> ./install.csh alland at the end all Fortran programs should be compiled and linked within the <bin> directory.3) The next step is to prepare all files for a Lagranto run. In my case, this looks as follows:rossby.ethz.ch[234]: ls -llrwxrwxrwx 1 michaesp wheel 30 Mar 25 14:53 P20110826_12 -> wrfout_d01_2011-08-26_12:00:00lrwxrwxrwx 1 michaesp wheel 30 Mar 25 14:54 P20110826_13 -> wrfout_d01_2011-08-26_12:01:00lrwxrwxrwx 1 michaesp wheel 30 Mar 25 14:54 P20110826_14 -> wrfout_d01_2011-08-26_12:02:00lrwxrwxrwx 1 michaesp wheel 30 Mar 25 14:54 P20110826_15 -> wrfout_d01_2011-08-26_12:03:00lrwxrwxrwx 1 michaesp wheel 30 Mar 25 14:54 P20110826_16 -> wrfout_d01_2011-08-26_12:04:00lrwxrwxrwx 1 michaesp wheel 30 Mar 25 14:54 P20110826_17 -> wrfout_d01_2011-08-26_12:05:00-rw-r--r-- 1 michaesp wheel 11676728 Apr 5 13:31 wrfmap.nc-rw-r--r-- 1 michaesp wheel 101793120 Mar 11 2013 wrfout_d01_2011-08-26_12:00:00-rw-r--r-- 1 michaesp wheel 101793120 Mar 11 2013 wrfout_d01_2011-08-26_12:01:00-rw-r--r-- 1 michaesp wheel 101793120 Mar 11 2013 wrfout_d01_2011-08-26_12:02:00-rw-r--r-- 1 michaesp wheel 101793120 Mar 11 2013 wrfout_d01_2011-08-26_12:03:00-rw-r--r-- 1 michaesp wheel 101793120 Mar 11 2013 wrfout_d01_2011-08-26_12:04:00-rw-r--r-- 1 michaesp wheel 101793120 Mar 11 2013 wrfout_d01_2011-08-26_12:05:00The files <wrfout*> are from WRF output; I link these files to the corresponding P{yyyymmdd_hh} files,the format and naming requested by Lagranto. Finally, there is an important auxiliary file <wrfmap.nc> whichis needed for the conversion between latitude/longitude coordinates and WRF grid coordinates.4) For tests you can find the files liste in 3) on our FTP server: <ftp://iacftp.ethz.ch/pub_read/sprenger/lagranto.wrf.test/>.It might be worthwile to do a first sample run based on these files. Then we certainly know that the basic installation is ok :-)5) An important file is the <wrfmap.nc> which includes the transformation between longitude/latitude and x/y coordinates.All calculations are done in WRF's x/y space, but at the beginning or end of a calculation you might want to convert fromor to geographical lon/lat coordinates. Please consult the manual page for this command (included in the WRF docu folder):> lagrantohelp wrfmapor if this doesn't work:> nroff -man lagranto.wrf/docu/man/wrfmap.06) Here are some first steps in running Lagranto with WRF. First, you have to create a start position file, which liststhe longitude, latitude and height of the starting position of the trajectory:> more startf.ll-70 45 5000In a next step you should convert this start position into WRF coordinates:> wrfmap -ll2xy startf.ll startf.xy> more startf.xyReference date 00000_0000 / Time range 0 mintime x y z-----------------------------0.00 107.66 131.30 5000At the moment the reference time (corresponding to time 0 of your trajectory) is not correctly set. Could you do this,at the moment, manually. The modified file in my case looks then as follows:> more startf.xyReference date 20110826_1200 / Time range 0 mintime x y z-----------------------------0.00 107.66 131.30 5000Wit this minor correction Lagranto should run. Here is the call and the corresponding output:> caltra 20110826_12 20110826_17 startf.xy trajectory.xy> more trajectory.xyReference date 20110826_1200 / Time range 300 mintime x y z-----------------------------0.00 107.66 131.30 50001.00 109.71 130.91 48862.00 111.79 130.80 47463.00 113.89 130.98 47884.00 116.03 131.46 48475.00 118.21 132.26 4810The position (x/y) of the air parcel is given in WRF coordinates; to get them back into lon/lat, you can useagain <wrfmap>:> wrfmap -xy2ll trajectory.xy trajectory.ll> more trajectory.llReference date 20110826_1200 / Time range 300 mintime lon lat z-----------------------------0.00 -70.00 44.99 50001.00 -69.32 44.86 48862.00 -68.62 44.78 47463.00 -67.91 44.78 47884.00 -67.18 44.84 48475.00 -66.42 44.97 4810That's it! Now would come tracing of fields along trajectories and/or selection of trajectories. But thesesteps can wait until you could reproduce all steps above :-) Let me know about your progress ;-)