Plotting the DECaLS footprint

Question

I'd like to compare the DECaLS footprint to various other survey footprints on a sky map. Is there existing code to do this?

Thanks.

Answer 1

Hi, not currently, no. But, depending on what exactly you want to plot (for instance brick centers, corners, number of exposures, etc.), take a look at for instance these notebooks that use pylab or healpy for plotting skymaps:

https://github.com/astro-datalab/notebooks-latest/blob/master/03_ScienceExamples/GOGREEN_GalaxiesInRichEnvironments/3_GOGREENDr1ClusterMembership.ipynb

https://github.com/astro-datalab/notebooks-latest/blob/master/03_ScienceExamples/ExploringM31/M31WithPhat.ipynb

Or if you have a scatter cloud, scipy.spatial.ConvexHull can compute a polygon to plot around the cloud.

Comments

I see, thanks. So the coordinates for the polygons themselves are not given anywhere?