Themis ASI Reader

Read & plot 256x256 "high resolution" THEMIS ASI ground-based imager data.

It also reads the THEMIS ASI star registered plate scale, giving azimuth and elevation for each pixel.

Install

Requires SpacePy to read CDF files (not NetCDF).

python setup_spacepy.py

And as usual:

python -m pip install -e .

If you have trouble with SpacePy, see SpacePy install notes.

Themis site map (2009)

Reading and Plotting THEMIS ASI Data

Get video data from Themis all-sky imager data repository

April 14, 2013, 8 UT Fort Yukon

wget -P ~/data http://themis.ssl.berkeley.edu/data/themis/thg/l1/asi/fykn/2013/04/thg_l1_asf_fykn_2013041408_v01.cdf

Python

./PlotThemis thg_l1_asf_fykn_2013041408_v01.cdf

Matlab

The Matlab code is obsolete, the Python version has so much more. :

readTHEMIS('thg_l1_asf_fykn_2013041408_v01.cdf')

Resources

• Themis GBO ASI site coordinates
• THEMIS GBO ASI plate scale
• THEMIS GBO ASI plate scale
• Themis GBO ASI data repository
• Themis GBO ASI mosaic (all sites together)

Themis Plate Scale data

I discovered that IDL 8.0 had a problem saving structured arrays of bytes. While current versions of IDL can read these corrupted .sav files, GDL 0.9.4 and SciPy 0.16.1 cannot. I submitted a patch to SciPy to allow reading these files, which was incorporated into SciPy 0.18.0.

As a fallback, read and rewrite the corrupted file with the IDL script in the idl directory.