Utilities for UAF Digital All-Sky Camera: reading and plotting
DASC all-sky camera utilities
Utilities for plotting, saving, analyzing the Poker Flat Research Range Digital All Sky Camera. (Other locations, too).
This program handles the corrupted FITS files due to the RAID array failure on 2013 data.
The raw data FITS are one image per file.
Most people will find it useful to have the example scripts and the tests built into the Git repo.
git clone https://github.com/space-physics/dascutils pip install -e dascutils
Many analysts may use the API directly, like:
import dascutils as du data = du.load('tests/PKR_DASC_0558_20151007_082351.743.FITS')
This returns a dictionary of xarray.DataArray, which is like a "smart" Numpy array.
The images are index by wavelength if it was specified in the data file, or 'unknown' otherwise.
The images are in a 3-D stack: (time, x, y).
data.time is the time of each image.
also several metadata parameters are included like the location of the camera.
Save the data using lossless compression to HDF5 by
Now we give several examples.
Download raw DASC files by time
Download Poker Flat Research Range "PKR" October 7, 2015 from 8:23 to 8:54 UTC to
python dascutils/DownloadDASC.py PKR 2015-10-07T08:23 2015-10-07T08:54 ~/data
-wfour-letter wavelength in nanometers e.g. 0630
As usual, we assume UTC and do NOT specify the timezone.
convert FITS stack to HDF5
It is very tedious to download large amounts of DASC data in single FITS files. We have tried to make this faster by multi-threading the download, but then the FTP server anti-leeching leaves us with broken downloads. As an alternative in general, it's more convenient to have a single HDF5 file for a day rather than 10,000 FITS files. Convert a bunch of FITS files to HDF5 like:
python dascutils/ConvertDASC_FITS_to_HDF5.py ~/data/2015-10-07 ~/data/2015-10-07.h5
-tstart stop times to convert
Make movies from DASC raw data files
Play movie of all wavelengths in subplots for files in a directory, for example:
python dascutils/PlayMovie.py dascutils/tests/
additional options include:
-tspecify time limits e.g.
-t 2014-01-02T02:30 2014-01-02T02:35
-wchoose only certain wavelength(s)
Spatial registration (plate scale)
cal/ directory contains
EL files corresponding to each pixel.
import dascutils as du data = du.load('tests/', azelfn='cal/PKR_DASC_20110112')
data includes data variables
el, same shape as the image(s), along with camera position in
- Be sure you know if you're using magnetic north or geographic north, or you'll see a rotation by the declination.
- Note the date in the filename--perhaps the camera was moved since before or long after that date?
A common task in auroral and airglow analysis is to project the image to an imaginary alttiude, that is, as if all the brightness were coming from that altitude. Each wavelength has a distinctive peak emission altitude due to the energies, kinetic reactions and vertical density profiles involved.
It takes considerable time to stretch the image stack pixels to fit a project geographic grid, so this is not enabled by default. It will be enabled if the du.load(..., wavelength_altitude_km=) parameter is used. See PlotDASCPixels.py for an example.
Some analyses can be done far more rapidly by just projecting pixel(s) of interest rather than an entire 3-D image stack.
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