-
Notifications
You must be signed in to change notification settings - Fork 21
/
forcedphot.py
528 lines (441 loc) · 18.9 KB
/
forcedphot.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
from __future__ import print_function
import sys
import numpy as np
from tractor import RaDecPos, NanoMaggies, PointSource, Tractor
from tractor.galaxy import (ExpGalaxy, DevGalaxy, FixedCompositeGalaxy,
disable_galaxy_cache)
from tractor.ellipses import EllipseE
from astrometry.util.fits import fits_table
from astrometry.util.ttime import Time
from .unwise import (unwise_tile_wcs, unwise_tiles_touching_wcs,
get_unwise_tractor_image)
def unwise_forcedphot(cat, tiles, bands=None, roiradecbox=None,
unwise_dir='.',
use_ceres=True, ceres_block=8,
save_fits=False, get_models=False, ps=None,
psf_broadening=None,
pixelized_psf=False):
'''
Given a list of tractor sources *cat*
and a list of unWISE tiles *tiles* (a fits_table with RA,Dec,coadd_id)
runs forced photometry, returning a FITS table the same length as *cat*.
'''
if bands is None:
bands = [1,2,3,4]
# # Severely limit sizes of models
for src in cat:
if isinstance(src, PointSource):
src.fixedRadius = 20
else:
src.halfsize = 20
wantims = ((ps is not None) or save_fits or get_models)
wanyband = 'w'
if get_models:
models = {}
fskeys = ['prochi2', 'pronpix', 'profracflux', 'proflux', 'npix',
'pronexp']
Nsrcs = len(cat)
phot = fits_table()
phot.tile = np.array([' '] * Nsrcs)
ra = np.array([src.getPosition().ra for src in cat])
dec = np.array([src.getPosition().dec for src in cat])
for band in bands:
print('Photometering WISE band', band)
wband = 'w%i' % band
# The tiles have some overlap, so for each source, keep the
# fit in the tile whose center is closest to the source.
tiledists = np.empty(Nsrcs)
tiledists[:] = 1e100
flux_invvars = np.zeros(Nsrcs, np.float32)
fitstats = dict([(k, np.zeros(Nsrcs, np.float32)) for k in fskeys])
nexp = np.zeros(Nsrcs, np.int16)
mjd = np.zeros(Nsrcs, np.float64)
for tile in tiles:
print('Reading tile', tile.coadd_id)
tim = get_unwise_tractor_image(unwise_dir, tile.coadd_id, band,
bandname=wanyband, roiradecbox=roiradecbox)
if tim is None:
print('Actually, no overlap with tile', tile.coadd_id)
continue
if pixelized_psf:
import unwise_psf
psfimg = unwise_psf.get_unwise_psf(band, tile.coadd_id)
print('PSF postage stamp', psfimg.shape, 'sum', psfimg.sum())
from tractor.psf import PixelizedPSF
psfimg /= psfimg.sum()
tim.psf = PixelizedPSF(psfimg)
print('### HACK ### normalized PSF to 1.0')
print('Set PSF to', tim.psf)
if False:
ph,pw = psfimg.shape
px,py = np.meshgrid(np.arange(ph), np.arange(pw))
cx = np.sum(psfimg * px)
cy = np.sum(psfimg * py)
print('PSF center of mass: %.2f, %.2f' % (cx, cy))
for sz in range(1, 11):
middle = pw//2
sub = (slice(middle-sz, middle+sz+1),
slice(middle-sz, middle+sz+1))
cx = np.sum((psfimg * px)[sub]) / np.sum(psfimg[sub])
cy = np.sum((psfimg * py)[sub]) / np.sum(psfimg[sub])
print('Size', sz, ': PSF center of mass: %.2f, %.2f' % (cx, cy))
import fitsio
fitsio.write('psfimg-%s-w%i.fits' % (tile.coadd_id, band), psfimg,
clobber=True)
if psf_broadening is not None and not pixelized_psf:
# psf_broadening is a factor by which the PSF FWHMs
# should be scaled; the PSF is a little wider
# post-reactivation.
psf = tim.getPsf()
from tractor import GaussianMixturePSF
if isinstance(psf, GaussianMixturePSF):
#
print('Broadening PSF: from', psf)
p0 = psf.getParams()
#print('Params:', p0)
pnames = psf.getParamNames()
#print('Param names:', pnames)
p1 = [p * psf_broadening**2 if 'var' in name else p
for (p, name) in zip(p0, pnames)]
#print('Broadened:', p1)
psf.setParams(p1)
print('Broadened PSF:', psf)
else:
print(
'WARNING: cannot apply psf_broadening to WISE PSF of type', type(psf))
print('Read image with shape', tim.shape)
# Select sources in play.
wcs = tim.wcs.wcs
H, W = tim.shape
ok, x, y = wcs.radec2pixelxy(ra, dec)
x = (x - 1.).astype(np.float32)
y = (y - 1.).astype(np.float32)
margin = 10.
I = np.flatnonzero((x >= -margin) * (x < W + margin) *
(y >= -margin) * (y < H + margin))
print(len(I), 'within the image + margin')
inbox = ((x[I] >= -0.5) * (x[I] < (W - 0.5)) *
(y[I] >= -0.5) * (y[I] < (H - 0.5)))
print(sum(inbox), 'strictly within the image')
# Compute L_inf distance to (full) tile center.
tilewcs = unwise_tile_wcs(tile.ra, tile.dec)
cx, cy = tilewcs.crpix
ok, tx, ty = tilewcs.radec2pixelxy(ra[I], dec[I])
td = np.maximum(np.abs(tx - cx), np.abs(ty - cy))
closest = (td < tiledists[I])
tiledists[I[closest]] = td[closest]
keep = inbox * closest
# Source indices (in the full "cat") to keep (the fit values for)
srci = I[keep]
if not len(srci):
print('No sources to be kept; skipping.')
continue
phot.tile[srci] = tile.coadd_id
nexp[srci] = tim.nuims[np.clip(np.round(y[srci]).astype(int), 0, H - 1),
np.clip(np.round(x[srci]).astype(int), 0, W - 1)]
# Source indices in the margins
margi = I[np.logical_not(keep)]
# sources in the box -- at the start of the subcat list.
subcat = [cat[i] for i in srci]
# include *copies* of sources in the margins
# (that way we automatically don't save the results)
subcat.extend([cat[i].copy() for i in margi])
assert(len(subcat) == len(I))
# FIXME -- set source radii, ...?
minsb = 0.
fitsky = False
# Look in image and set radius based on peak height??
tractor = Tractor([tim], subcat)
if use_ceres:
from tractor.ceres_optimizer import CeresOptimizer
tractor.optimizer = CeresOptimizer(BW=ceres_block,
BH=ceres_block)
tractor.freezeParamsRecursive('*')
tractor.thawPathsTo(wanyband)
kwa = dict(fitstat_extras=[('pronexp', [tim.nims])])
t0 = Time()
R = tractor.optimize_forced_photometry(
minsb=minsb, mindlnp=1., sky=fitsky, fitstats=True,
variance=True, shared_params=False,
wantims=wantims, **kwa)
print('unWISE forced photometry took', Time() - t0)
if use_ceres:
term = R.ceres_status['termination']
print('Ceres termination status:', term)
# Running out of memory can cause failure to converge
# and term status = 2.
# Fail completely in this case.
if term != 0:
raise RuntimeError(
'Ceres terminated with status %i' % term)
if wantims:
ims0 = R.ims0
ims1 = R.ims1
IV, fs = R.IV, R.fitstats
if save_fits:
import fitsio
(dat, mod, ie, chi, roi) = ims1[0]
wcshdr = fitsio.FITSHDR()
tim.wcs.wcs.add_to_header(wcshdr)
tag = 'fit-%s-w%i' % (tile.coadd_id, band)
fitsio.write('%s-data.fits' %
tag, dat, clobber=True, header=wcshdr)
fitsio.write('%s-mod.fits' % tag, mod,
clobber=True, header=wcshdr)
fitsio.write('%s-chi.fits' % tag, chi,
clobber=True, header=wcshdr)
if get_models:
(dat, mod, ie, chi, roi) = ims1[0]
models[(tile.coadd_id, band)] = (mod, tim.roi)
if ps:
tag = '%s W%i' % (tile.coadd_id, band)
(dat, mod, ie, chi, roi) = ims1[0]
sig1 = tim.sig1
plt.clf()
plt.imshow(dat, interpolation='nearest', origin='lower',
cmap='gray', vmin=-3 * sig1, vmax=10 * sig1)
plt.colorbar()
plt.title('%s: data' % tag)
ps.savefig()
plt.clf()
plt.imshow(mod, interpolation='nearest', origin='lower',
cmap='gray', vmin=-3 * sig1, vmax=10 * sig1)
plt.colorbar()
plt.title('%s: model' % tag)
ps.savefig()
plt.clf()
plt.imshow(chi, interpolation='nearest', origin='lower',
cmap='gray', vmin=-5, vmax=+5)
plt.colorbar()
plt.title('%s: chi' % tag)
ps.savefig()
# Save results for this tile.
# the "keep" sources are at the beginning of the "subcat" list
flux_invvars[srci] = IV[:len(srci)].astype(np.float32)
if hasattr(tim, 'mjdmin') and hasattr(tim, 'mjdmax'):
mjd[srci] = (tim.mjdmin + tim.mjdmax) / 2.
if fs is None:
continue
for k in fskeys:
x = getattr(fs, k)
# fitstats are returned only for un-frozen sources
fitstats[k][srci] = np.array(x).astype(np.float32)[:len(srci)]
# Note, this is *outside* the loop over tiles.
# The fluxes are saved in the source objects, and will be set based on
# the 'tiledists' logic above.
nm = np.array([src.getBrightness().getBand(wanyband) for src in cat])
nm_ivar = flux_invvars
# Sources out of bounds, eg, never change from their default
# (1-sigma or whatever) initial fluxes. Zero them out instead.
nm[nm_ivar == 0] = 0.
phot.set(wband + '_nanomaggies', nm.astype(np.float32))
phot.set(wband + '_nanomaggies_ivar', nm_ivar)
dnm = np.zeros(len(nm_ivar), np.float32)
okiv = (nm_ivar > 0)
dnm[okiv] = (1. / np.sqrt(nm_ivar[okiv])).astype(np.float32)
okflux = (nm > 0)
mag = np.zeros(len(nm), np.float32)
mag[okflux] = (NanoMaggies.nanomaggiesToMag(nm[okflux])
).astype(np.float32)
dmag = np.zeros(len(nm), np.float32)
ok = (okiv * okflux)
dmag[ok] = (np.abs((-2.5 / np.log(10.)) * dnm[ok] / nm[ok])
).astype(np.float32)
mag[np.logical_not(okflux)] = np.nan
dmag[np.logical_not(ok)] = np.nan
phot.set(wband + '_mag', mag)
phot.set(wband + '_mag_err', dmag)
for k in fskeys:
phot.set(wband + '_' + k, fitstats[k])
phot.set(wband + '_nexp', nexp)
if not np.all(mjd == 0):
phot.set(wband + '_mjd', mjd)
if get_models:
return phot,models
return phot
def main():
import optparse
from astrometry.util.plotutils import PlotSequence
from astrometry.util.util import Tan
parser = optparse.OptionParser(usage='%prog [options] incat.fits out.fits')
parser.add_option('-r', '--ralo', dest='ralo', type=float,
help='Minimum RA')
parser.add_option('-R', '--rahi', dest='rahi', type=float,
help='Maximum RA')
parser.add_option('-d', '--declo', dest='declo', type=float,
help='Minimum Dec')
parser.add_option('-D', '--dechi', dest='dechi', type=float,
help='Maximum Dec')
parser.add_option('-b', '--band', dest='bands', action='append', type=int,
default=[], help='WISE band to photometer (default: 1,2)')
parser.add_option('-u', '--unwise', dest='unwise_dir',
default='unwise-coadds',
help='Directory containing unWISE coadds')
parser.add_option('--no-ceres', dest='ceres', action='store_false',
default=True,
help='Use scipy lsqr rather than Ceres Solver?')
parser.add_option('--ceres-block', '-B', dest='ceresblock', type=int,
default=8,
help='Ceres image block size (default: %default)')
parser.add_option('--plots', dest='plots',
default=False, action='store_true')
parser.add_option('--save-fits', dest='save_fits',
default=False, action='store_true')
# parser.add_option('--ellipses', action='store_true',
# help='Assume catalog shapes are ellipse descriptions (not r,ab,phi)')
# parser.add_option('--ra', help='Center RA')
# parser.add_option('--dec', help='Center Dec')
# parser.add_option('--width', help='Degrees width (in RA*cos(Dec))')
# parser.add_option('--height', help='Degrees height (Dec)')
opt, args = parser.parse_args()
if len(args) != 2:
parser.print_help()
sys.exit(-1)
if len(opt.bands) == 0:
opt.bands = [1, 2]
# Allow specifying bands like "123"
bb = []
for band in opt.bands:
for s in str(band):
bb.append(int(s))
opt.bands = bb
print('Bands', opt.bands)
ps = None
if opt.plots:
ps = PlotSequence('unwise')
infn, outfn = args
T = fits_table(infn)
print('Read', len(T), 'sources from', infn)
if opt.declo is not None:
T.cut(T.dec >= opt.declo)
if opt.dechi is not None:
T.cut(T.dec <= opt.dechi)
# Let's be a bit smart about RA wrap-around. Compute the 'center'
# of the RA points, use the cross product against that to define
# inequality (clockwise-of).
r = np.deg2rad(T.ra)
x = np.mean(np.cos(r))
y = np.mean(np.sin(r))
rr = np.hypot(x, y)
x /= rr
y /= rr
midra = np.rad2deg(np.arctan2(y, x))
midra += 360. * (midra < 0)
xx = np.cos(r)
yy = np.sin(r)
T.cross = x * yy - y * xx
minra = T.ra[np.argmin(T.cross)]
maxra = T.ra[np.argmax(T.cross)]
if opt.ralo is not None:
r = np.deg2rad(opt.ralo)
xx = np.cos(r)
yy = np.sin(r)
crosscut = x * yy - y * xx
T.cut(T.cross >= crosscut)
print('Cut to', len(T), 'with RA >', opt.ralo)
if opt.rahi is not None:
r = np.deg2rad(opt.rahi)
xx = np.cos(r)
yy = np.sin(r)
crosscut = x * yy - y * xx
T.cut(T.cross <= crosscut)
print('Cut to', len(T), 'with RA <', opt.rahi)
if opt.declo is None:
opt.declo = T.dec.min()
if opt.dechi is None:
opt.dechi = T.dec.max()
if opt.ralo is None:
opt.ralo = T.ra[np.argmin(T.cross)]
if opt.rahi is None:
opt.rahi = T.ra[np.argmax(T.cross)]
T.delete_column('cross')
print('RA range:', opt.ralo, opt.rahi)
print('Dec range:', opt.declo, opt.dechi)
x = np.mean([np.cos(np.deg2rad(r)) for r in (opt.ralo, opt.rahi)])
y = np.mean([np.sin(np.deg2rad(r)) for r in (opt.ralo, opt.rahi)])
midra = np.rad2deg(np.arctan2(y, x))
midra += 360. * (midra < 0)
middec = (opt.declo + opt.dechi) / 2.
print('RA,Dec center:', midra, middec)
pixscale = 2.75 / 3600.
H = (opt.dechi - opt.declo) / pixscale
dra = 2. * min(np.abs(midra - opt.ralo), np.abs(midra - opt.rahi))
W = dra * np.cos(np.deg2rad(middec)) / pixscale
margin = 5
W = int(W) + margin * 2
H = int(H) + margin * 2
print('W,H', W, H)
targetwcs = Tan(midra, middec, (W + 1) / 2., (H + 1) / 2.,
-pixscale, 0., 0., pixscale, float(W), float(H))
#print('Target WCS:', targetwcs)
ra0, dec0 = targetwcs.pixelxy2radec(0.5, 0.5)
ra1, dec1 = targetwcs.pixelxy2radec(W + 0.5, H + 0.5)
roiradecbox = [ra0, ra1, dec0, dec1]
#print('ROI RA,Dec box', roiradecbox)
tiles = unwise_tiles_touching_wcs(targetwcs)
print('Cut to', len(tiles), 'unWISE tiles')
disable_galaxy_cache()
cols = T.get_columns()
all_ptsrcs = not('type' in cols)
if not all_ptsrcs:
assert('shapeexp' in cols)
assert('shapedev' in cols)
assert('fracdev' in cols)
wanyband = 'w'
print('Creating Tractor catalog...')
cat = []
for i, t in enumerate(T):
pos = RaDecPos(t.ra, t.dec)
flux = NanoMaggies(**{wanyband: 1.})
if all_ptsrcs:
cat.append(PointSource(pos, flux))
continue
tt = t.type.strip()
if tt in ['PTSRC', 'STAR', 'S']:
cat.append(PointSource(pos, flux))
elif tt in ['EXP', 'E']:
shape = EllipseE(*t.shapeexp)
cat.append(ExpGalaxy(pos, flux, shape))
elif tt in ['DEV', 'D']:
shape = EllipseE(*t.shapedev)
cat.append(DevGalaxy(pos, flux, shape))
elif tt in ['COMP', 'C']:
eshape = EllipseE(*t.shapeexp)
dshape = EllipseE(*t.shapedev)
cat.append(FixedCompositeGalaxy(pos, flux, t.fracdev,
eshape, dshape))
else:
print('Did not understand row', i, 'of input catalog:')
t.about()
assert(False)
W = unwise_forcedphot(cat, tiles, roiradecbox=roiradecbox,
bands=opt.bands, unwise_dir=opt.unwise_dir,
use_ceres=opt.ceres, ceres_block=opt.ceresblock,
save_fits=opt.save_fits, ps=ps)
W.writeto(outfn)
if __name__ == '__main__':
main()
sys.exit(0)
# T = fits_table()
# T.ra = np.arange(0., 10.)
# T.dec = np.arange(len(T))
# fn = 'x.fits'
# outfn = 'out.fits'
# T.writeto(fn)
# prog = sys.argv[0]
# sys.argv = [prog, fn, outfn]
# main()
#
# T = fits_table()
# T.ra = np.arange(350., 371.) % 360
# T.dec = np.arange(len(T))
# T.writeto(fn)
# sys.argv = [prog, fn, outfn]
# main()
#
# T = fits_table()
# T.ra = np.arange(350., 371.) % 360
# T.dec = np.arange(len(T))
# T.writeto(fn)
# sys.argv = [prog, fn, outfn, '-r', '355', '-R', 9]
# main()