Add GLEAM images

[cdeil]

I just now saw the GLEAM survey images here: http://www.nature.com/news/gleam-highres-composite-jpg-7.41222?article=1.21156

Looking here, it seems that they have nice images of some supernova remnants and other Galactic emission components (scroll down to the GLEAM wavelength): http://gleamoscope.icrar.org/gleamoscope/trunk/src/

There's descriptions here: http://www.mwatelescope.org/science/gleam-survey https://arxiv.org/pdf/1505.06041v1.pdf but I didn't see FITS images or a HIPS version here yet: http://aladin.u-strasbg.fr/hips/list

When a HIPS version is available, we should add it to gamma-sky.net

[tboch]

@cdeil : it seems that ICRAR already produced a HiPS: http://ict.icrar.org/store/gleam/gleam_color/

[cdeil]

Indeed, http://ict.icrar.org/store/gleam/gleam_color/ is very nice.

We should add it to gamma-sky.net.

Their server seems to be very slow.

Maybe we should put a copy here, which is being served very fast: https://github.com/cdeil/hips-data

@tboch - is there a command to "clone" or "download" a HiPS?

[tboch]

Yes, Hipsgen has a dedicated command -clone mirror for this. Example:

java -jar Hipsgen.jar in="http://ict.icrar.org/store/gleam/gleam_color/" out=my_local_path -clone mirror

[cdeil]

@tboch - Thanks for the tip with -clone mirror

Looks like the option is not documented: https://gist.github.com/cdeil/0a920bdae417e92cfe33a47790000cec

It's a few GB and takes an estimated 3 hours to clone, which is not really what I wanted.

Is there any way to only clone order 3 and 4, but not order 5? Or restrict the region to only download the tiles for the Galactic plane?

I think HiPS cloning might be something worth adding to the Python package. Made an issue here to discuss: https://github.com/hipspy/hips/issues/122

[cdeil]

I made a clone and put it here: https://github.com/cdeil/hips-gleam-data

I did remove Norder5, because looking visually, it didn't contain extra info compared to Norder4:

$ du -hs Norder*
237M    Norder3
814M    Norder4

Norder3 contains most info, but is visibly lower resolution, i.e. point sources are just spread across a few pixels.

[tboch]

you can use the option hips_order=... to restrict the maximum order you want to download.