For Pandeia Engine v1.6

Python Requirements:

Installing the Pandeia Engine requires a python environment with the dependencies listed above, a set of telescope-specific datafiles, and an optional (but highly recommended) second set of data files for additional spectral manipulation capabilities.

Code

The engine can be installed with

pip install pandeia.engine==1.6

Then set up the data files.

Data

Required Data

In order to function, the Pandeia Engine requires one* set of reference data (containing instrument definitions):

• James Webb Space Telescope: https://stsci.app.box.com/v/pandeia-refdata-v1p6
• Nancy Grace Roman Space Telescope: https://stsci.box.com/v/pandeia-refdata-v1p6-roman

Download and untar the files to a suitable location.

Environment variable: $pandeia_refdata must point to the location of the top of the data file tree (the directory containing the VERSION_PSF file)

*Both telescope datasets may be untarred to the same location to produce an engine that can work with either observatory; any files the two packages have in common may be overwritten.

Recommended Data

• An additional dataset:  https://archive.stsci.edu/hlsp/reference-atlases can be used to provide more spectroscopic functionality (phoenix spectral models, normalization by HST bandpasses, among others).

Once untarred, the files will produce a directory tree of grp/redcat/trds. The pandeia.engine uses the contents of the trds directory.

Environment variable: $PYSYN_CDBS must point to the trds directory (NOT grp)

Verify Installation

Open up a terminal with access to the conda installation, and type

python -c "import pandeia.engine; pandeia.engine.pandeia_version()"

If properly installed and configured, it should show the refdata version and synphot data directory, like this:

Pandeia Engine version:  1.6
Pandeia RefData version:  1.6
Pysynphot Data:  /your/data/directory/synphot

Helper Script

The following script (which can also be added to your .bashrc or .bash_profile file) assumes you are operating in a BASH shell where a python installation has been installed and activated, that you've installed the pandeia refdata in ${HOME}/data/pandeia, and the cdbs folder from the additional dataset moved and renamed to ${HOME}/data/synphot

#!/bin/sh
export PYSYN_CDBS=${HOME}/data/synphot
export pandeia_refdata=${HOME}/data/pandeia

Once in place, "source"ing this file will set up the pandeia environment.