gnomview reads in a HEALPix sky map in FITS format and generates a gnomic (or gnomonic) projection of it, that can be visualized on the screen or exported in a GIF, JPEG, PNG, PDF or Postscript file. gnomview allows the selection of the coordinate system, map size, color table, color bar inclusion, linear, log, hybrid or histogram equalised color scaling, maximum and minimum range for the plot, plot-title etc. It also allows the representation of the polarization field.
gnomview, 'planck100GHZ-LFI.fits', rot=[160,-30], reso_arcmin=2., $ |
pxsize = 500., $ |
title='Simulated Planck LFI Sky Map at 100GHz', $ |
min=-100,max=100 |
gnomview reads in the map 'planck100GHZ-LFI.fits' and generates an output image of the size of 500 x 500 screen pixels, with a resolution of 2 arcmin/screen pixel at the center. The temperature scale has been set to lie between 100, and the units will show as K. The title 'Simulated Planck LFI Sky Map at 100GHz' has been appended to the image. The map is centered at (l=160, b=-30)
map = findgen(48) |
triangle= create_struct('coord','G','ra',[0,80,0],'dec',[40,45,65]) |
gnomview,map,/online,res=25,graticule=[45,30],rot=[10,20,30],$ |
title='Gnomic projection',subtitle='gnomview', $ |
outline=triangle |
makes a gnomic projection of map (see Figure 1b on page ) after an arbitrary rotation, with a graticule grid (with a 45o step in longitude and 30o in latitude) and an arbitrary triangular outline
Version 3.82, 2022-07-28