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       cavern — process raw survey data


       cavern [options]  survex data file


       Cavern is the Survex data processing engine.

       If  multiple survey data files are listed on the command line, they are
       processed in order from left to right.  Settings  are  reset  to  their
       defaults before processing each file.


       -p, --percentage
                 You can get cavern to display the percentage progress through
                 the current file.  As of Survex  0.90  this  is  disabled  by
                 default,  but  you  can  enable  it if you want.  Because the
                 value given is for the current file, the values  jump  around
                 for  a  multi-file  survey project. Also note that displaying
                 this information slows down processing a little.

       -o, --output=OUTPUT
                 Sets location for output files.

       -q, --quiet
                 Only show a  brief  summary  (--quiet  --quiet  or  -qq  will
                 display warnings and errors only).

       -s, --no-auxiliary-files
                 do not create .err file.

       -w, --warnings-are-errors
                 turn warnings into errors.

       --log     Send screen output to a .log file.


       Cavern reads in text files containing the survey data .svx) and outputs
       two files, with the extensions .3d and .err.  By  default  these  files
       are  put  in  the current directory, with the same base filename as the
       first .svx file read, but a different extension.  You  can  change  the
       directory  and/or base filename using the --output command line option.

       E.g. if you process the data file entrance.svx with the command  cavern
       entrance entrance.3d and entrance.err will be created.

       Cavern also gives a range of statistics at the end of a successful run:

          ·  The highest and lowest stations and the height difference between

          ·  The  total  length  of  the survey (before and after adjustment).
             This total excludes survey legs flagged as SURFACE, DUPLICATE, or

          ·  The  number of stations and legs.  Note that a *EQUATE is counted
             as a leg in this statistic.

          ·  The East-West and North-South ranges, and the North-most,  South-
             most, East-most, and West-most stations.

          ·  The  number  of  each  size of node in the network (where size is
             number of connections to a station) i.e. a one node is the end of
             a  dead-end  traverse,  a  two-node  is  a typical station in the
             middle of a traverse, a three-node is a T-junction etc.

          ·  How long the processing took and how much CPU time was used.

   .3d - data describing the loop-closed centre line
       This file contains details of the stations  and  legs,  and  any  flags
       associated with them.

   .err - loop closure statistics (%age errors, etc)
       This  file  contains statistics about each traverse in the survey which
       is part of a loop. It includes various statistics  for  each  traverse,
       such   as  the  percentage  error  per  leg.   You  should  study  this
       information to determine if any  parts  of  the  survey  are  of  lower
       quality or contain gross errors.

Error Messages

       There  are  a number of error messages that you may get when processing
       data.  Most of these are self explanatory, and will be caused  by  such
       problems  as typing mistakes, or by your survey data not being attached
       to fixed points (in this  situation,  Survex  will  list  some  of  the
       stations that are not connected).

       Along  with  the  error  message,  the  filename and line number of the
       offending line will be printed (or the  filename  for  errors  such  as
       ‘file  not found’).  The format of the filename and line number is that
       used by gcc, so if your editor can parse errors from gcc, you should be
       able to set it to allow you to jump to the file and line of each error.

       Cavern will stop after more than 50  errors.   This  usually  indicates
       something  like the incorrect data order being specified.  Deluging the
       user with error messages makes the actual problem less clear.

See Also

       3dtopos(1),  aven(1),  cad3d(1),  diffpos(1),  extend(1),   sorterr(1),