SYNOPSIS

cavern [ options ] survex data file ...

DESCRIPTION

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.

OPTIONS

-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.

-v, --3d-version

Specify the 3d file format version to output. By default the latest version is written, but you can override this to produce a 3d file which can be read by software which doesn't understand the latest 3d file format version. Note that any information which the specified format version didn't support will be omitted.

OUTPUT

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 then the files 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 them
• The total length of the survey (before and after adjustment). This total excludes survey legs flagged as SURFACE, DUPLICATE, or SPLAY.
• 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.