An open source radiocarbon (14C) calibration software. Written in Python http://c14.iosa.it/
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 

196 lines
4.7 KiB

User's manual
=============
.. contents::
The current version of IOSACal is in beta state (i.e. suitable for experimental
production use), but has already all the basic functionality, like calibration,
generation of publication-quality plots and determination of probability
intervals.
Basic usage
-----------
The command line program is called ``iosacal``. It can generate both
text output and image plots.
The typical usage is::
$ iosacal -d 7505 -s 93 --id "P-769"
Output will look like the following:
::
# P-769
Calibration of P-769: 7505 ± 93 BP
## Calibrated age
Atmospheric data from Reimer et al (2020)
### 68.2% probability
* 8386 CalBP - 8283 CalBP (42.1%)
* 8266 CalBP - 8199 CalBP (26.0%)
### 95.4% probability
* 8515 CalBP - 8500 CalBP (0.8%)
* 8457 CalBP - 8163 CalBP (89.7%)
* 8137 CalBP - 8116 CalBP (1.0%)
* 8102 CalBP - 8039 CalBP (3.9%)
If you want an image instead of text output, just add the ``-p`` flag::
$ iosacal -d 7505 -s 93 --id "P-769" -p
The result will be saved into the image file named
``P-769_7505_93.pdf`` in the same directory. It will look more or less
like this:
.. image:: /images/P-769_7505_93.png
Other calibration curves
------------------------
By default, ``iosacal`` uses the *IntCal20* calibration curve. IOSACal
is however able to read *any* calibration curve that uses the same
format, such as those available from <http://www.intcal.org/>. If you want to specify a different
calibration curve provide the canonical name of the curve in lower case
(e.g. ``intcal09``, ``marine09``).
To specify a calibration curve, use the ``-c`` command line option::
$ iosacal -d 7505 -s 93 --id "P-769" -p -c intcal04
Please note that IOSACal already includes the calibration curves listed below:
- *IntCal20*
- *Marine20*
- *ShCal20*
- *IntCal13*
- *Marine13*
- *ShCal13*
- *IntCal09*
- *Marine09*
- *IntCal04*
- *Marine04*
- *ShCal04*
- *IntCal98*
- *Marine98*
Multiple dates
--------------
It is also possible to give IOSACal more than one radiocarbon determination,
to see how 2 or more samples relate between themselves.
To use the multiple dates feature, just pass multiple ``-d``, ``-s`` and
``--id`` options on the command line::
$ iosacal \
-d 7729 -s 80 --id "P-1365" \
-d 7661 -s 99 --id "P-1375" \
-d 7579 -s 86 --id "P-827" \
-d 7572 -s 92 --id "P-772" \
-d 7538 -s 89 --id "P-778" \
-d 7505 -s 93 --id "P-769" \
-p -m -n "Catalhöyük East level VI A"
The order in which values are passed to IOSACal matters, so the first
date will be matched to the first standard deviation and so on.
This way, you will get 6 different single plots. The ``-m`` flag is used to
indicate you want a **compound plot**. It's also useful to use the ``-n`` option
to give a name to the image and a title to the plot.
The resulting compound plot looks like this:
.. image:: /images/catalhuyuk-level6a.png
.. warning::
Currently IOSACal doesn't perform any Bayesian matching of
calibrated ages. This feature will be added in future versions.
Command line options
--------------------
IOSACal works from the command line. These are the available options.
.. program:: iosacal
.. cmdoption:: -h
Show an help message and exit
.. cmdoption:: -d <date>, --date=<date>
Conventional radiocarbon age, i.e. the non-calibrated radiocarbon
BP date for the sample
.. cmdoption:: -s <sigma>, --sigma=<sigma>
Error at 1 standard deviation for the non-calibrated date given
with the above option.
.. cmdoption:: --id <sample_id>
Lab ID of the sample, e.g. *P-1244*, *OxA-3311* or *BETA-248559*
.. cmdoption:: -c <curve>, --curve=<curve>
Calibration curve to be used [default: ``intcal13``]
If you want to specify a different calibration curve provide the
curve canonical name in lower case (e.g. ``intcal09``, ``marine13``).
Plot output
~~~~~~~~~~~
.. cmdoption:: -p, --plot
Enables the graphical plot output.
.. cmdoption:: -o, --oxcal
Plots will be more similar to OxCal [default: False]
.. cmdoption:: -n <name>, --name <name>
Specify a name for the output plot [default: "iosacal"]
.. cmdoption:: -1, --single
Generate single plots for each sample. The default action.
.. cmdoption:: --no-single
Don't generate single plots for each sample.
.. cmdoption:: -m, --stacked
Generate stacked plot with all samples.
BP or calendar dates
~~~~~~~~~~~~~~~~~~~~
Use these mutually exclusive options to choose which type of dates
you like as output.
.. cmdoption:: --bp
Express date in Calibrated BP Age (default action)
.. cmdoption:: --ad
Express date in Calibrated BC/AD calendar Age
.. cmdoption:: --ce
Express date in Calibrated BCE/CE calendar Age