code: def _make_wcsgeom_from_config(config):
          
  
          binning = config['binning']
          binsz = binning['binsz']
          coordsys = binning.get('coordsys', 'GAL')
          roiwidth = binning['roiwidth']
          proj = binning.get('proj', 'AIT')
          ra = config['selection']['ra']
          dec = config['selection']['dec']
          npix = int(np.round(roiwidth / binsz))
          skydir = SkyCoord(ra * u.deg, dec * u.deg)
  
          wcsgeom = WcsGeom.create(npix=npix, binsz=binsz,
                                   proj=proj, coordsys=coordsys,
                                   skydir=skydir)
          return wcsgeom
docs: Build a `WCS.Geom` object from a fermipy coniguration file