def get_lonlat(satscene, row, col):
"""Estimate lon and lat.
"""
conf = ConfigParser()
conf.read(os.path.join(CONFIG_PATH, satscene.fullname + ".cfg"))
path = conf.get("modis-level2", "dir")
filename = satscene.time_slot.strftime("thin_MYD03.A%Y%j.%H%M.005.NRT.hdf")
filename = os.path.join(path, filename)
if(os.path.exists(filename) and
(satscene.lon is None or satscene.lat is None)):
data = SD(filename)
lat = data.select("Latitude")
fill_value = lat.attributes()["_FillValue"]
satscene.lat = np.ma.masked_equal(lat.get(), fill_value)
lon = data.select("Longitude")
fill_value = lon.attributes()["_FillValue"]
satscene.lon = np.ma.masked_equal(lon.get(), fill_value)
estimate = True
try:
lon = satscene.lon[row, col]
lat = satscene.lat[row, col]
if satscene.lon.mask[row, col] == False and satscene.lat.mask[row, col] == False:
estimate = False
except TypeError:
pass
except IndexError:
pass
if not estimate:
return lon, lat
from mpop.saturn.two_line_elements import Tle
tle = Tle(satellite=satscene.satname)
track_start = tle.get_latlonalt(satscene.time_slot)
track_end = tle.get_latlonalt(satscene.time_slot + satscene.granularity)
# WGS84
# flattening
f = 1/298.257223563
# semi_major_axis
a = 6378137.0
s, alpha12, alpha21 = vinc_dist(f, a,
track_start[0], track_start[1],
track_end[0], track_end[1])
scanlines = satscene.granularity.seconds / satscene.span
if row < scanlines/2:
if row == 0:
track_now = track_start
else:
track_now = vinc_pt(f, a, track_start[0], track_start[1], alpha12,
(s * row) / scanlines)
lat_now = track_now[0]
lon_now = track_now[1]
s, alpha12, alpha21 = vinc_dist(f, a,
lat_now, lon_now,
track_end[0], track_end[1])
fac = 1
else:
if scanlines - row - 1 == 0:
track_now = track_end
else:
track_now = vinc_pt(f, a, track_end[0], track_end[1], alpha21,
(s * (scanlines - row - 1)) / scanlines)
lat_now = track_now[0]
lon_now = track_now[1]
s, alpha12, alpha21 = vinc_dist(f, a,
lat_now, lon_now,
track_start[0], track_start[1])
fac = -1
if col < 1354/2:
lat, lon, alp = vinc_pt(f, a, lat_now, lon_now, alpha12 + np.pi/2 * fac,
2340000.0 / 2 - (2340000.0/1354) * col)
else:
lat, lon, alp = vinc_pt(f, a, lat_now, lon_now, alpha12 - np.pi/2 * fac,
(2340000.0/1354) * col - 2340000.0 / 2)
lon = np.rad2deg(lon)
lat = np.rad2deg(lat)
if lon > 180:
lon -= 360
if lon <= -180:
lon += 360
return lon, lat
def get_lonlat(satscene, row, col):
"""Estimate lon and lat.
"""
import glob
conf = ConfigParser()
conf.read(os.path.join(CONFIG_PATH, satscene.fullname + ".cfg"))
path = conf.get("modis-level2", "dir")
geofile_tmpl = conf.get("modis-level2", "geofile")
filename_tmpl = satscene.time_slot.strftime(geofile_tmpl)
file_list = glob.glob(os.path.join(path, filename_tmpl))
if len(file_list) > 1:
raise IOError("More than 1 geolocation file matching!" + filename_tmpl)
elif len(file_list) == 0:
logger.info("No MODIS geolocation file matching: " + filename_tmpl
+ ", estimating")
filename = ""
else:
filename = file_list[0]
logger.debug("Geolocation file = " + filename)
if(os.path.exists(filename) and
(satscene.lon is None or satscene.lat is None)):
data = SD(filename)
lat = data.select("Latitude")
fill_value = lat.attributes()["_FillValue"]
satscene.lat = np.ma.masked_equal(lat.get(), fill_value)
lon = data.select("Longitude")
fill_value = lon.attributes()["_FillValue"]
satscene.lon = np.ma.masked_equal(lon.get(), fill_value)
estimate = True
try:
lon = satscene.lon[row, col]
lat = satscene.lat[row, col]
if(satscene.lon.mask[row, col] == False and
satscene.lat.mask[row, col] == False):
estimate = False
except TypeError:
pass
except IndexError:
pass
if not estimate:
return lon, lat
from mpop.saturn.two_line_elements import Tle
tle = Tle(satellite=satscene.satname)
track_start = tle.get_latlonalt(satscene.time_slot)
track_end = tle.get_latlonalt(satscene.time_slot + satscene.granularity)
# WGS84
# flattening
f__ = 1 / 298.257223563
# semi_major_axis
a__ = 6378137.0
s__, alpha12, alpha21 = vinc_dist(f__, a__,
track_start[0], track_start[1],
track_end[0], track_end[1])
scanlines = satscene.granularity.seconds / satscene.span
if row < scanlines / 2:
if row == 0:
track_now = track_start
else:
track_now = vinc_pt(f__, a__, track_start[0], track_start[1],
alpha12, (s__ * row) / scanlines)
lat_now = track_now[0]
lon_now = track_now[1]
s__, alpha12, alpha21 = vinc_dist(f__, a__,
lat_now, lon_now,
track_end[0], track_end[1])
fac = 1
else:
if scanlines - row - 1 == 0:
track_now = track_end
else:
track_now = vinc_pt(f__, a__, track_end[0], track_end[1], alpha21,
(s__ * (scanlines - row - 1)) / scanlines)
lat_now = track_now[0]
lon_now = track_now[1]
s__, alpha12, alpha21 = vinc_dist(f__, a__,
lat_now, lon_now,
track_start[0], track_start[1])
fac = -1
if col < 1354 / 2:
lat, lon, alp = vinc_pt(f__, a__, lat_now, lon_now,
alpha12 + np.pi / 2 * fac,
2340000.0 / 2 - (2340000.0 / 1354) * col)
else:
lat, lon, alp = vinc_pt(f__, a__, lat_now, lon_now,
alpha12 - np.pi / 2 * fac,
(2340000.0 / 1354) * col - 2340000.0 / 2)
del alp
lon = np.rad2deg(lon)
lat = np.rad2deg(lat)
if lon > 180:
lon -= 360
if lon <= -180:
lon += 360
return lon, lat
def get_lonlat(satscene, row, col):
"""Estimate lon and lat.
"""
import glob
conf = ConfigParser()
conf.read(os.path.join(CONFIG_PATH, satscene.fullname + ".cfg"))
path = conf.get("modis-level2", "dir")
geofile_tmpl = conf.get("modis-level2", "geofile")
filename_tmpl = satscene.time_slot.strftime(geofile_tmpl)
file_list = glob.glob(os.path.join(path, filename_tmpl))
if len(file_list) > 1:
raise IOError("More than 1 geolocation file matching!" + filename_tmpl)
elif len(file_list) == 0:
logger.info("No MODIS geolocation file matching: " + filename_tmpl
+ ", estimating")
filename = ""
else:
filename = file_list[0]
logger.debug("Geolocation file = " + filename)
if(os.path.exists(filename) and
(satscene.lon is None or satscene.lat is None)):
data = SD(filename)
lat = data.select("Latitude")
fill_value = lat.attributes()["_FillValue"]
satscene.lat = np.ma.masked_equal(lat.get(), fill_value)
lon = data.select("Longitude")
fill_value = lon.attributes()["_FillValue"]
satscene.lon = np.ma.masked_equal(lon.get(), fill_value)
estimate = True
try:
lon = satscene.lon[row, col]
lat = satscene.lat[row, col]
if(satscene.lon.mask[row, col] == False and
satscene.lat.mask[row, col] == False):
estimate = False
except TypeError:
pass
except IndexError:
pass
if not estimate:
return lon, lat
from mpop.saturn.two_line_elements import Tle
tle = Tle(satellite=satscene.satname)
track_start = tle.get_latlonalt(satscene.time_slot)
track_end = tle.get_latlonalt(satscene.time_slot + satscene.granularity)
# WGS84
# flattening
f__ = 1 / 298.257223563
# semi_major_axis
a__ = 6378137.0
s__, alpha12, alpha21 = vinc_dist(f__, a__,
track_start[0], track_start[1],
track_end[0], track_end[1])
scanlines = satscene.granularity.seconds / satscene.span
if row < scanlines / 2:
if row == 0:
track_now = track_start
else:
track_now = vinc_pt(f__, a__, track_start[0], track_start[1],
alpha12, (s__ * row) / scanlines)
lat_now = track_now[0]
lon_now = track_now[1]
s__, alpha12, alpha21 = vinc_dist(f__, a__,
lat_now, lon_now,
track_end[0], track_end[1])
fac = 1
else:
if scanlines - row - 1 == 0:
track_now = track_end
else:
track_now = vinc_pt(f__, a__, track_end[0], track_end[1], alpha21,
(s__ * (scanlines - row - 1)) / scanlines)
lat_now = track_now[0]
lon_now = track_now[1]
s__, alpha12, alpha21 = vinc_dist(f__, a__,
lat_now, lon_now,
track_start[0], track_start[1])
fac = -1
if col < 1354 / 2:
lat, lon, alp = vinc_pt(f__, a__, lat_now, lon_now,
alpha12 + np.pi / 2 * fac,
2340000.0 / 2 - (2340000.0 / 1354) * col)
else:
lat, lon, alp = vinc_pt(f__, a__, lat_now, lon_now,
alpha12 - np.pi / 2 * fac,
(2340000.0 / 1354) * col - 2340000.0 / 2)
del alp
lon = np.rad2deg(lon)
lat = np.rad2deg(lat)
if lon > 180:
lon -= 360
if lon <= -180:
lon += 360
return lon, lat