def nearest_neighbour(tile, outdir, checkplots=False, saveplots=False):
"""
"""
from astropy.table import Table, hstack
import srpylib
import match_lists
import matplotlib.pyplot as plt
import numpy as np
db, host, user, password, db_table = rd_config_wsdb(table='wise')
t = Table.read(outdir + tile + "_WISEfp_DEScat.fits")
ra_min, ra_max, dec_min, dec_max = srpylib.min_max_match(
t["RA_CALC_G"], t["DEC_CALC_G"], 1.0, DES_box=True
)
query_wise = "select ra, dec FROM allwise.main WHERE ra > " + \
ra_min + " and ra < " + ra_max + " and dec > " + dec_min + \
" and dec < " + dec_max
RA, DEC = sqlutil.get(query_wise, db=db, host=host,
user=user, password=password)
dists, inds = match_lists.match_lists(
t["RA_CALC_G"].data, t["DEC_CALC_G"].data, RA, DEC, 1.0, 2
)
match_distance = dists[:,1]*3600.0
if checkplots:
plt.axvline(6.1)
plt.axvline(6.4)
plt.axvline(6.5)
plt.axvline(12.0)
plt.hist(match_distance, bins=100)
plt.xlabel('Match Distance(")')
plt.ylabel("Number")
plt.title("Nearest Neighbours:" + tile)
plt.show()
print("Median Distance:", np.median(match_distance))
def get_coords(infile=None, coord_file=None, tilename=None):
"""
# Take DES tile, find all WISE objects on that tile.
# infile = "/data/desardata/Y1A1/" + tile + "/" + tile + "_z.fits.fz"
# DATAPATH = '/data/desardata/Y1A1/'
"""
import math
logger = logging.getLogger()
outpath = os.path.dirname(coord_file)
if not os.path.exists(outpath):
try:
os.makedirs(outpath)
except Exception as error:
logger.exception(error)
print("Unexpected error:", sys.exc_info()[0])
traceback.print_exc(file=sys.stdout)
raise
logger.debug('Reading tile image to get corners: %s', infile)
with fits.open(infile) as fhlist:
hdr = fhlist[1].header
w = wcs.WCS(hdr, naxis=2)
# If this is ever used for non square inmages this needs checking
pix_corners = [[0, 0], [0, hdr["NAXIS1"]], [
hdr["NAXIS2"], 0], [hdr["NAXIS1"], hdr["NAXIS2"]]]
w_corners = w.wcs_pix2world(pix_corners, 1)
[corner_ra, corner_dec] = zip(*w_corners)
"""
corner_ra = sorted(corner_ra)
corner_dec = sorted(corner_dec)
#Take the slightly smaller square inside the not square image
ra_min = corner_ra[1]
ra_max = corner_ra[2]
dec_min = corner_dec[1]
dec_max = corner_dec[2]
"""
delta_ra = max(corner_ra) - min(corner_ra)
delta_dec = max(corner_dec) - min(corner_dec)
dec_mean = (min(corner_dec) + min(corner_dec)) / 2.0
delta_ra = delta_ra * math.cos(math.radians(dec_mean))
logger.debug('dec_mean: %s', dec_mean)
logger.debug('delta_ra, delta_dec: %s; %s', delta_ra, delta_dec)
# raw_input("Enter any key to continue: ")
# Some of these objects won't be on the DES tile so will return infs
ra_min = str(min(corner_ra))
ra_max = str(max(corner_ra))
dec_min = str(min(corner_dec))
dec_max = str(max(corner_dec))
query_wise = "select ra, dec FROM allwise.main WHERE ra > " + \
ra_min + \
" and ra < " + ra_max + " and dec > " + \
dec_min + " and dec < " + dec_max
# special case where crossing 24hrs ra > ra_max or ra < ra_min
if delta_ra > 180.0:
query_wise = "select ra, dec FROM allwise.main WHERE (ra > " + \
ra_max + \
" or ra < " + ra_min + ") and dec > " + \
dec_min + " and dec < " + dec_max
db, host, user, password, db_table = rd_config_wsdb(table='wise')
RA_wise, DEC_wise = sqlutil.get(
query_wise, db=db, host=host,
user=user, password=password
)
logger.info('%s: Number of wise sources: %s', tilename, len(RA_wise))
info = ""
for (ra, dec) in zip(RA_wise, DEC_wise):
info += (str(ra) + " " + str(dec) + "\n")
with open(coord_file, "w") as f:
logger.debug('Writing coords: %s', coord_file)
try:
f.write(info)
logger.debug('Successfully written coordinate file: %s', coord_file)
except IOError as e:
print("I/O error({0}): {1}".format(e.errno, e.strerror))
except:
print("Unexpected error:", sys.exc_info()[0])
raise
# except IOError as (errno, strerror):
# print("I/O error({0}): {1}".format(errno, strerror))
# print('Failed to write coordinate file: ' + str(e))
# logger.error('Failed to write coordinate file: ' + str(e))
# sys.exit()
# pass
# except OSError as (errno, strerror):
# print("Hello World:OS error({0}): {1}".format(errno, strerror))
# pass
# except:
# print("Unexpected error:", sys.exc_info()[0])
# # traceback.print_exc(file=sys.stdout)
# raise
return coord_file
