import galsim import numpy as np class FocalPlane(object): def __init__(self, config=None, survey_type='Photometric', bad_chips=None): """Get the focal plane layout """ self.nchips = 42 if bad_chips == None: self.bad_chips = [] else: self.bad_chips = bad_chips self.ignore_chips = [] if survey_type == 'Photometric': for i in range(5): self.ignore_chips.append(i+1) self.ignore_chips.append(i+26) self.ignore_chips.append(10) self.ignore_chips.append(21) for i in range(31, 43): self.ignore_chips.append(i) elif survey_type == 'Spectroscopic': for i in range(6, 26): if i == 10 or i == 21: continue else: self.ignore_chips.append(i) for i in range(31, 43): self.ignore_chips.append(i) elif survey_type == 'FGS': for i in range(1, 31): self.ignore_chips.append(i) if config is not None: self.nchip_x = config["nchip_x"] self.nchip_y = config["nchip_y"] self.npix_tot_x = config["npix_tot_x"] self.npix_tot_y = config["npix_tot_y"] self.npix_gap_x = config["npix_gap_x"] self.npix_gap_y = config["npix_gap_y"] if "chipLabelIDs" in config: self.chipLabelIDs = config["chipLabelIDs"] if "bad_chips" in config: self.bad_chips = config["bad_chips"] else: self.nchip_x = 6 self.nchip_y = 5 self.npix_tot_x = 59516 self.npix_tot_y = 49752 self.npix_gap_x = (534, 1309) self.npix_gap_y = 898 self._getCenter() def _getCenter(self): self.cen_pix_x = 0 self.cen_pix_y = 0 def getChipLabel(self, chipID): return str("0%d"%chipID)[-2:] def isBadChip(self, chipID): """Check if chip #(chipID) on the focal plane is bad or not """ return (chipID in self.bad_chips) def isIgnored(self, chipID): return (chipID in self.ignore_chips) def getTanWCS(self, ra, dec, img_rot, pix_scale, xcen=None, ycen=None, logger=None): """ Get the WCS of the image mosaic using Gnomonic/TAN projection Parameter: ra, dec: float (RA, Dec) of pointing of optical axis img_rot: galsim Angle object Rotation of image pix_scale: float Pixel size in unit of as/pix Returns: WCS of the focal plane """ if logger is not None: logger.info(" Construct the wcs of the entire image mosaic using Gnomonic/TAN projection") if (xcen == None) or (ycen == None): xcen = self.cen_pix_x ycen = self.cen_pix_y # dudx = -np.cos(img_rot.rad) * pix_scale # dudy = -np.sin(img_rot.rad) * pix_scale # dvdx = -np.sin(img_rot.rad) * pix_scale # dvdy = +np.cos(img_rot.rad) * pix_scale dudx = -np.cos(img_rot.rad) * pix_scale dudy = +np.sin(img_rot.rad) * pix_scale dvdx = -np.sin(img_rot.rad) * pix_scale dvdy = -np.cos(img_rot.rad) * pix_scale moscen = galsim.PositionD(x=xcen, y=ycen) sky_center = galsim.CelestialCoord(ra=ra*galsim.degrees, dec=dec*galsim.degrees) affine = galsim.AffineTransform(dudx, dudy, dvdx, dvdy, origin=moscen) WCS = galsim.TanWCS(affine, sky_center, units=galsim.arcsec) return WCS def getSkyCoverage(self, wcs, x0, x1, y0, y1): """ The sky coverage of an area """ r2d = 180.0/np.pi s1 = wcs.toWorld(galsim.PositionD(x0,y0)) s2 = wcs.toWorld(galsim.PositionD(x0,y1)) s3 = wcs.toWorld(galsim.PositionD(x1,y0)) s4 = wcs.toWorld(galsim.PositionD(x1,y1)) ra = [s1.ra.rad*r2d, s2.ra.rad*r2d, s3.ra.rad*r2d, s4.ra.rad*r2d] dec = [s1.dec.rad*r2d, s2.dec.rad*r2d, s3.dec.rad*r2d, s4.dec.rad*r2d] return galsim.BoundsD(min(ra), max(ra), min(dec), max(dec))