Commit dea2661a722bcd820e093004c32650e59c130dee
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e156834b
Add HealPix flux computation test.
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test/test_healpix_flux.py
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| 1 | +#! /usr/bin/env python | |
| 2 | +# ========================================================================== | |
| 3 | +# This script tests the accuracy of the HealPix flux computation. It sets | |
| 4 | +# a single pixel of the HealPix map, projects the HealPix map into a CAR | |
| 5 | +# map to compute the flux in the pixel in an indpendent way, and compare | |
| 6 | +# this flux estimates to that one derived from the flux() method. | |
| 7 | +# | |
| 8 | +# Note that this test relies on the correctness of the CAR flux() | |
| 9 | +# computation. | |
| 10 | +# | |
| 11 | +# -------------------------------------------------------------------------- | |
| 12 | +# | |
| 13 | +# Copyright (C) 2015 Juergen Knoedlseder | |
| 14 | +# | |
| 15 | +# This program is free software: you can redistribute it and/or modify | |
| 16 | +# it under the terms of the GNU General Public License as published by | |
| 17 | +# the Free Software Foundation, either version 3 of the License, or | |
| 18 | +# (at your option) any later version. | |
| 19 | +# | |
| 20 | +# This program is distributed in the hope that it will be useful, | |
| 21 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 22 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 23 | +# GNU General Public License for more details. | |
| 24 | +# | |
| 25 | +# You should have received a copy of the GNU General Public License | |
| 26 | +# along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 27 | +# | |
| 28 | +# ========================================================================== | |
| 29 | +import gammalib | |
| 30 | + | |
| 31 | +# Allocate HealPix map | |
| 32 | +nside = 16 | |
| 33 | +npix = 12 * nside*nside | |
| 34 | +print("Pixels %d" % npix) | |
| 35 | + | |
| 36 | +# Loop over all pixels | |
| 37 | +for index in range(npix): | |
| 38 | + | |
| 39 | + # Allocate HealPix map | |
| 40 | + map = gammalib.GSkymap("GAL", nside, "RING") | |
| 41 | + | |
| 42 | + # Create WCS map, set Healpix index and merge into WCS map | |
| 43 | + wcs = gammalib.GSkymap("CAR", "GAL", 0.0, 0.0, -0.1, 0.1, 3600, 1800) | |
| 44 | + map[index] = 1.0 | |
| 45 | + wcs += map | |
| 46 | + | |
| 47 | + # Get total flux in WCS map (in HealPix pixel only) | |
| 48 | + total = 0.0 | |
| 49 | + for i in range(wcs.npix()): | |
| 50 | + if map.dir2inx(wcs.inx2dir(i)) == index: | |
| 51 | + total += wcs.flux(i) | |
| 52 | + else: | |
| 53 | + wcs[i] = 0 | |
| 54 | + | |
| 55 | + # Save map | |
| 56 | + wcs.save("healpix.fits", True) | |
| 57 | + | |
| 58 | + # Print results | |
| 59 | + print("Index %d" % index) | |
| 60 | + print("Flux in pixel from integration .....: %f" % total) | |
| 61 | + print("Flux in pixel from flux() method ...: %f (%f%%)" % \ | |
| 62 | + (map.flux(index),(map.flux(index)-total)/total*100.0)) | |
| 0 | 63 | \ No newline at end of file | ... | ... |