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|
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (c) 2010, 2012.
# SMHI,
# Folkborgsvägen 1,
# Norrköping,
# Sweden
# Author(s):
# Martin Raspaud <martin.raspaud@smhi.se>
# This file is part of mpop.
# mpop is free software: you can redistribute it and/or modify it under the
# terms of the GNU General Public License as published by the Free Software
# Foundation, either version 3 of the License, or (at your option) any later
# version.
# mpop is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU General Public License for more details.
# You should have received a copy of the GNU General Public License along with
# mpop. If not, see <http://www.gnu.org/licenses/>.
"""Interface to EPS Avhrr/3 level 1b format.
http://oiswww.eumetsat.org/WEBOPS/eps-pg/AVHRR/AVHRR-PG-11L1bFormat.htm
http://www.eumetsat.int/idcplg?IdcService=GET_FILE&\
dDocName=PDF_TEN_96167-EPS-GPFS&RevisionSelectionMethod=LatestReleased
http://www.eumetsat.int/idcplg?IdcService=GET_FILE&\
dDocName=PDF_TEN_97231-EPS-AVHRR&RevisionSelectionMethod=LatestReleased
"""
import struct
import datetime
import numpy as np
import math
from scipy import interpolate
import os.path
import glob
from ConfigParser import ConfigParser
from mpop import CONFIG_PATH
from mpop.satin.logger import LOG
RECORD_CLASS = ["Reserved", "MPHR", "SPHR",
"IPR", "GEADR", "GIADR",
"VEADR", "VIADR", "MDR"]
INSTRUMENT_GROUP = ["GENERIC", "AMSU-A", "ASCAT", "ATOVS", "AVHRR/3", "GOME",
"GRAS", "HIRS/4", "IASA", "MHS", "SEM", "ADCS", "SBUV",
"DUMMY", "ARCHIVE", "IASI_L2"]
MPHR = [100, 100, 100, 100, 100, 37, 36, 36, 35, 36, 48, 48, 48, 48, 37, 38, 38,
38, 38, 48, 48, 34, 34, 36, 48, 48, 38, 38, 44, 51, 44, 44, 44, 44, 44,
44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44,
35, 48, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 41, 41, 41,
34]
SPHR = [38, 36]
GIADR_SUB = [None, "GIADR-RADIANCE", "GIADR-ANALOG"]
MAX_SCAN_LINES = 2000
def get_bit(bitstring, bit):
"""Get a given *bit* from *bitstring*.
"""
return bitstring & (2 ** bit)
def read_u_bytes(fdes, size):
"""Read unsigned bytes, and scale it by 10 ** *sf_*.
"""
cases = {
1: ">B",
2: ">H",
4: ">I",
8: ">Q"
}
return struct.unpack(cases[size], fdes.read(size))[0]
def read_bytes(fdes, size, sf_=0):
"""Read signed bytes, and scale it by 10 ** *sf_*.
"""
cases = {
1: ">b",
2: ">h",
4: ">i",
8: ">q"
}
if sf_ != 0:
return struct.unpack(cases[size], fdes.read(size))[0] * 10.0 ** sf_
else:
return struct.unpack(cases[size], fdes.read(size))[0]
def read_short_cds(fdes):
"""Read a short cds date.
"""
difference = datetime.timedelta(days=read_u_bytes(fdes, 2),
milliseconds=read_u_bytes(fdes, 4))
epoch = datetime.datetime(2000, 1, 1)
return epoch + difference
def read_long_cds(fdes):
"""Read a long cds date.
"""
difference = datetime.timedelta(days=read_u_bytes(fdes, 2),
milliseconds=read_u_bytes(fdes, 4),
microseconds=read_u_bytes(fdes, 2))
epoch = datetime.datetime(2000, 1, 1)
return epoch + difference
def read_ascii_field(fdes, size):
"""Read an ascii field.
"""
field_name = fdes.read(30).strip()
fdes.read(2)
field_value = fdes.read(size - 33).strip()
fdes.read(1)
return (field_name, field_value)
def read_bitstring(fdes, size):
"""Read a bit string.
"""
cases = {
1: ">B",
2: ">H",
4: ">I",
8: ">Q"
}
return struct.unpack(cases[size], fdes.read(size))[0]
def print_bitstring(s__):
"""Print a bitstring.
"""
res = ""
ts_ = s__
i = 0
for i in range(16):
res = str(ts_ & 1) + res
ts_ = ts_ >> 1
del i
print res
def read_grh(fdes):
"""Read GRH.
"""
grh = {}
record_class = fdes.read(1)
if record_class == "":
return "EOF"
grh["RECORD_CLASS"] = RECORD_CLASS[ord(record_class)]
grh["INSTRUMENT_GROUP"] = INSTRUMENT_GROUP[ord(fdes.read(1))]
grh["RECORD_SUBCLASS"] = ord(fdes.read(1))
grh["RECORD_SUBCLASS_VERSION"] = ord(fdes.read(1))
grh["RECORD_SIZE"] = read_u_bytes(fdes, 4)
grh["RECORD_START_TIME"] = read_short_cds(fdes)
grh["RECORD_STOP_TIME"] = read_short_cds(fdes)
return grh
def read_mphr(fdes, grh, metadata):
"""Read MPHR.
"""
del grh
for i in MPHR:
field_name, field_value = read_ascii_field(fdes, i)
try:
metadata[field_name] = eval(field_value)
except:
metadata[field_name] = str(field_value)
return metadata
def read_sphr(fdes, grh, metadata):
"""Read SPHR.
"""
del grh
if(metadata["INSTRUMENT_ID"] != "AVHR"):
raise NotImplementedError("Only Avhrr for now...")
fdes.read(49)
for i in SPHR:
field_name, field_value = read_ascii_field(fdes, i)
try:
metadata[field_name] = eval(field_value)
except:
metadata[field_name] = str(field_value)
def read_ipr(fdes, grh, metadata):
"""Read IPR.
"""
del grh, metadata
ipr = {}
ipr["TARGET_RECORD_CLASS"] = read_u_bytes(fdes, 1)
ipr["TARGET_INSTRUMENT_GROUP"] = read_u_bytes(fdes, 1)
ipr["TARGET_RECORD_SUBCLASS"] = read_u_bytes(fdes, 1)
ipr["TARGET_RECORD_OFFSET"] = read_u_bytes(fdes, 4)
return ipr
def read_geadr(fdes, grh, metadata):
"""Read GEADR.
"""
del metadata
geadr = {}
field_name, field_val = read_ascii_field(fdes, grh["RECORD_SIZE"] - 20)
geadr[field_name] = field_val
return geadr
def read_giadr(fdes, grh, metadata):
"""Read GIADR.
"""
if(metadata["INSTRUMENT_ID"] != "AVHR"):
raise NotImplementedError("Only Avhrr for now...")
if(metadata["PROCESSING_LEVEL"] != "1B"):
raise NotImplementedError("Only level 1B for now...")
if grh["RECORD_SUBCLASS"] == 1:
return read_giadr_radiance(fdes, grh, metadata)
elif grh["RECORD_SUBCLASS"] == 2:
return read_giadr_analog(fdes, grh, metadata)
elif grh["RECORD_SUBCLASS"] == 99:
fdes.read(grh["RECORD_SIZE"] - 20)
return
else:
raise ValueError("Undefined subclass " +
str(grh["RECORD_SUBCLASS"]) +
", version "+
str(grh["RECORD_SUBCLASS_VERSION"]) +
"...")
def read_giadr_radiance(fdes, grh, metadata):
"""Read GIADR.
"""
del grh
del metadata
giadr = {}
giadr["RAMP_CALIBRATION_COEFFICIENT"] = read_bitstring(fdes, 2)
giadr["YEAR_RECENT_CALIBRATION"] = read_u_bytes(fdes, 2)
giadr["DAY_RECENT_CALIBRATION"] = read_u_bytes(fdes, 2)
giadr["PRIMARY_CALIBRATION_ALGORITHM_ID"] = read_u_bytes(fdes, 2)
giadr["PRIMARY_CALIBRATION_ALGORITHM_OPTION"] = read_bitstring(fdes, 2)
giadr["SECONDARY_CALIBRATION_ALGORITHM_ID"] = read_u_bytes(fdes, 2)
giadr["SECONDARY_CALIBRATION_ALGORITHM_OPTION"] = read_bitstring(fdes, 2)
giadr["IR_TEMPERATURE1_COEFFICIENT1"] = read_bytes(fdes, 2)
giadr["IR_TEMPERATURE1_COEFFICIENT2"] = read_bytes(fdes, 2)
giadr["IR_TEMPERATURE1_COEFFICIENT3"] = read_bytes(fdes, 2)
giadr["IR_TEMPERATURE1_COEFFICIENT4"] = read_bytes(fdes, 2)
giadr["IR_TEMPERATURE1_COEFFICIENT5"] = read_bytes(fdes, 2)
giadr["IR_TEMPERATURE1_COEFFICIENT6"] = read_bytes(fdes, 2)
giadr["IR_TEMPERATURE2_COEFFICIENT1"] = read_bytes(fdes, 2)
giadr["IR_TEMPERATURE2_COEFFICIENT2"] = read_bytes(fdes, 2)
giadr["IR_TEMPERATURE2_COEFFICIENT3"] = read_bytes(fdes, 2)
giadr["IR_TEMPERATURE2_COEFFICIENT4"] = read_bytes(fdes, 2)
giadr["IR_TEMPERATURE2_COEFFICIENT5"] = read_bytes(fdes, 2)
giadr["IR_TEMPERATURE2_COEFFICIENT6"] = read_bytes(fdes, 2)
giadr["IR_TEMPERATURE3_COEFFICIENT1"] = read_bytes(fdes, 2)
giadr["IR_TEMPERATURE3_COEFFICIENT2"] = read_bytes(fdes, 2)
giadr["IR_TEMPERATURE3_COEFFICIENT3"] = read_bytes(fdes, 2)
giadr["IR_TEMPERATURE3_COEFFICIENT4"] = read_bytes(fdes, 2)
giadr["IR_TEMPERATURE3_COEFFICIENT5"] = read_bytes(fdes, 2)
giadr["IR_TEMPERATURE3_COEFFICIENT6"] = read_bytes(fdes, 2)
giadr["IR_TEMPERATURE4_COEFFICIENT1"] = read_bytes(fdes, 2)
giadr["IR_TEMPERATURE4_COEFFICIENT2"] = read_bytes(fdes, 2)
giadr["IR_TEMPERATURE4_COEFFICIENT3"] = read_bytes(fdes, 2)
giadr["IR_TEMPERATURE4_COEFFICIENT4"] = read_bytes(fdes, 2)
giadr["IR_TEMPERATURE4_COEFFICIENT5"] = read_bytes(fdes, 2)
giadr["IR_TEMPERATURE4_COEFFICIENT6"] = read_bytes(fdes, 2)
giadr["CH1_SOLAR_FILTERED_IRRADIANCE"] = read_bytes(fdes, 2, -1)
giadr["CH1_EQUIVALENT FILTER_WIDTH"] = read_bytes(fdes, 2, -3)
giadr["CH2_SOLAR_FILTERED_IRRADIANCE"] = read_bytes(fdes, 2, -1)
giadr["CH2_EQUIVALENT FILTER_WIDTH"] = read_bytes(fdes, 2, -3)
giadr["CH3A_SOLAR_FILTERED_IRRADIANCE"] = read_bytes(fdes, 2, -1)
giadr["CH3A_EQUIVALENT FILTER_WIDTH"] = read_bytes(fdes, 2, -3)
giadr["CH3B_CENTRAL_WAVENUMBER"] = read_bytes(fdes, 4, -2)
giadr["CH3B_CONSTANT1"] = read_bytes(fdes, 4, -5)
giadr["CH3B_CONSTANT2_SLOPE"] = read_bytes(fdes, 4, -6)
giadr["CH4_CENTRAL_WAVENUMBER"] = read_bytes(fdes, 4, -3)
giadr["CH4_CONSTANT1"] = read_bytes(fdes, 4, -5)
giadr["CH4_CONSTANT2_SLOPE"] = read_bytes(fdes, 4, -6)
giadr["CH5_CENTRAL_WAVENUMBER"] = read_bytes(fdes, 4, -3)
giadr["CH5_CONSTANT1"] = read_bytes(fdes, 4, -5)
giadr["CH5_CONSTANT2_SLOPE"] = read_bytes(fdes, 4, -6)
return giadr
def read_giadr_analog(fdes, grh, metadata):
"""Read GIADR.
"""
giadr = {}
giadr["PATCH_TEMPERATURE_COEFFICIENT1"] = read_bytes(fdes, 2)
giadr["PATCH_TEMPERATURE_COEFFICIENT2"] = read_bytes(fdes, 2)
giadr["PATCH_TEMPERATURE_COEFFICIENT3"] = read_bytes(fdes, 2)
giadr["PATCH_TEMPERATURE_COEFFICIENT4"] = read_bytes(fdes, 2)
giadr["PATCH_TEMPERATURE_COEFFICIENT5"] = read_bytes(fdes, 2)
giadr["PATCH_TEMPERATURE_EXTENDED_COEFFICIENT1"] = read_bytes(fdes, 2)
giadr["PATCH_TEMPERATURE_EXTENDED_COEFFICIENT2"] = read_bytes(fdes, 2)
giadr["PATCH_TEMPERATURE_EXTENDED_COEFFICIENT3"] = read_bytes(fdes, 2)
giadr["PATCH_TEMPERATURE_EXTENDED_COEFFICIENT4"] = read_bytes(fdes, 2)
giadr["PATCH_TEMPERATURE_EXTENDED_COEFFICIENT5"] = read_bytes(fdes, 2)
giadr["PATCH_POWER_COEFFICIENT1"] = read_bytes(fdes, 2)
giadr["PATCH_POWER_COEFFICIENT2"] = read_bytes(fdes, 2)
giadr["PATCH_POWER_COEFFICIENT3"] = read_bytes(fdes, 2)
giadr["PATCH_POWER_COEFFICIENT4"] = read_bytes(fdes, 2)
giadr["PATCH_POWER_COEFFICIENT5"] = read_bytes(fdes, 2)
giadr["RADIATOR_TEMPERATURE_COEFFICIENT1"] = read_bytes(fdes, 2)
giadr["RADIATOR_TEMPERATURE_COEFFICIENT2"] = read_bytes(fdes, 2)
giadr["RADIATOR_TEMPERATURE_COEFFICIENT3"] = read_bytes(fdes, 2)
giadr["RADIATOR_TEMPERATURE_COEFFICIENT4"] = read_bytes(fdes, 2)
giadr["RADIATOR_TEMPERATURE_COEFFICIENT5"] = read_bytes(fdes, 2)
giadr["BLACKBODY_TEMPERATURE1_COEFFICIENT1"] = read_bytes(fdes, 2)
giadr["BLACKBODY_TEMPERATURE1_COEFFICIENT2"] = read_bytes(fdes, 2)
giadr["BLACKBODY_TEMPERATURE1_COEFFICIENT3"] = read_bytes(fdes, 2)
giadr["BLACKBODY_TEMPERATURE1_COEFFICIENT4"] = read_bytes(fdes, 2)
giadr["BLACKBODY_TEMPERATURE1_COEFFICIENT5"] = read_bytes(fdes, 2)
giadr["BLACKBODY_TEMPERATURE2_COEFFICIENT1"] = read_bytes(fdes, 2)
giadr["BLACKBODY_TEMPERATURE2_COEFFICIENT2"] = read_bytes(fdes, 2)
giadr["BLACKBODY_TEMPERATURE2_COEFFICIENT3"] = read_bytes(fdes, 2)
giadr["BLACKBODY_TEMPERATURE2_COEFFICIENT4"] = read_bytes(fdes, 2)
giadr["BLACKBODY_TEMPERATURE2_COEFFICIENT5"] = read_bytes(fdes, 2)
giadr["BLACKBODY_TEMPERATURE3_COEFFICIENT1"] = read_bytes(fdes, 2)
giadr["BLACKBODY_TEMPERATURE3_COEFFICIENT2"] = read_bytes(fdes, 2)
giadr["BLACKBODY_TEMPERATURE3_COEFFICIENT3"] = read_bytes(fdes, 2)
giadr["BLACKBODY_TEMPERATURE3_COEFFICIENT4"] = read_bytes(fdes, 2)
giadr["BLACKBODY_TEMPERATURE3_COEFFICIENT5"] = read_bytes(fdes, 2)
giadr["BLACKBODY_TEMPERATURE4_COEFFICIENT1"] = read_bytes(fdes, 2)
giadr["BLACKBODY_TEMPERATURE4_COEFFICIENT2"] = read_bytes(fdes, 2)
giadr["BLACKBODY_TEMPERATURE4_COEFFICIENT3"] = read_bytes(fdes, 2)
giadr["BLACKBODY_TEMPERATURE4_COEFFICIENT4"] = read_bytes(fdes, 2)
giadr["BLACKBODY_TEMPERATURE4_COEFFICIENT5"] = read_bytes(fdes, 2)
giadr["ELECTRONIC_CURRENT_COEFFICIENT1"] = read_bytes(fdes, 2)
giadr["ELECTRONIC_CURRENT_COEFFICIENT2"] = read_bytes(fdes, 2)
giadr["ELECTRONIC_CURRENT_COEFFICIENT3"] = read_bytes(fdes, 2)
giadr["ELECTRONIC_CURRENT_COEFFICIENT4"] = read_bytes(fdes, 2)
giadr["ELECTRONIC_CURRENT_COEFFICIENT5"] = read_bytes(fdes, 2)
giadr["MOTOR_CURRENT_COEFFICIENT1"] = read_bytes(fdes, 2)
giadr["MOTOR_CURRENT_COEFFICIENT2"] = read_bytes(fdes, 2)
giadr["MOTOR_CURRENT_COEFFICIENT3"] = read_bytes(fdes, 2)
giadr["MOTOR_CURRENT_COEFFICIENT4"] = read_bytes(fdes, 2)
giadr["MOTOR_CURRENT_COEFFICIENT5"] = read_bytes(fdes, 2)
giadr["EARTH_SHIELD_POSITION_COEFFICIENT1"] = read_bytes(fdes, 2)
giadr["EARTH_SHIELD_POSITION_COEFFICIENT2"] = read_bytes(fdes, 2)
giadr["EARTH_SHIELD_POSITION_COEFFICIENT3"] = read_bytes(fdes, 2)
giadr["EARTH_SHIELD_POSITION_COEFFICIENT4"] = read_bytes(fdes, 2)
giadr["EARTH_SHIELD_POSITION_COEFFICIENT5"] = read_bytes(fdes, 2)
giadr["ELECTRONIC_TEMPERATURE_COEFFICIENT1"] = read_bytes(fdes, 2)
giadr["ELECTRONIC_TEMPERATURE_COEFFICIENT2"] = read_bytes(fdes, 2)
giadr["ELECTRONIC_TEMPERATURE_COEFFICIENT3"] = read_bytes(fdes, 2)
giadr["ELECTRONIC_TEMPERATURE_COEFFICIENT4"] = read_bytes(fdes, 2)
giadr["ELECTRONIC_TEMPERATURE_COEFFICIENT5"] = read_bytes(fdes, 2)
giadr["COOLER_HOUSING_TEMPERATURE_COEFFICIENT1"] = read_bytes(fdes, 2)
giadr["COOLER_HOUSING_TEMPERATURE_COEFFICIENT2"] = read_bytes(fdes, 2)
giadr["COOLER_HOUSING_TEMPERATURE_COEFFICIENT3"] = read_bytes(fdes, 2)
giadr["COOLER_HOUSING_TEMPERATURE_COEFFICIENT4"] = read_bytes(fdes, 2)
giadr["COOLER_HOUSING_TEMPERATURE_COEFFICIENT5"] = read_bytes(fdes, 2)
giadr["BASEPLATE_TEMPERATURE_COEFFICIENT1"] = read_bytes(fdes, 2)
giadr["BASEPLATE_TEMPERATURE_COEFFICIENT2"] = read_bytes(fdes, 2)
giadr["BASEPLATE_TEMPERATURE_COEFFICIENT3"] = read_bytes(fdes, 2)
giadr["BASEPLATE_TEMPERATURE_COEFFICIENT4"] = read_bytes(fdes, 2)
giadr["BASEPLATE_TEMPERATURE_COEFFICIENT5"] = read_bytes(fdes, 2)
giadr["MOTOR_HOUSING_TEMPERATURE_COEFFICIENT1"] = read_bytes(fdes, 2)
giadr["MOTOR_HOUSING_TEMPERATURE_COEFFICIENT2"] = read_bytes(fdes, 2)
giadr["MOTOR_HOUSING_TEMPERATURE_COEFFICIENT3"] = read_bytes(fdes, 2)
giadr["MOTOR_HOUSING_TEMPERATURE_COEFFICIENT4"] = read_bytes(fdes, 2)
giadr["MOTOR_HOUSING_TEMPERATURE_COEFFICIENT5"] = read_bytes(fdes, 2)
giadr["AD_CONVERTER_TEMPERATURE_COEFFICIENT1"] = read_bytes(fdes, 2)
giadr["AD_CONVERTER_TEMPERATURE_COEFFICIENT2"] = read_bytes(fdes, 2)
giadr["AD_CONVERTER_TEMPERATURE_COEFFICIENT3"] = read_bytes(fdes, 2)
giadr["AD_CONVERTER_TEMPERATURE_COEFFICIENT4"] = read_bytes(fdes, 2)
giadr["AD_CONVERTER_TEMPERATURE_COEFFICIENT5"] = read_bytes(fdes, 2)
giadr["DETECTOR4_BIAS_VOLTAGE_COEFFICIENT1"] = read_bytes(fdes, 2)
giadr["DETECTOR4_BIAS_VOLTAGE_COEFFICIENT2"] = read_bytes(fdes, 2)
giadr["DETECTOR4_BIAS_VOLTAGE_COEFFICIENT3"] = read_bytes(fdes, 2)
giadr["DETECTOR4_BIAS_VOLTAGE_COEFFICIENT4"] = read_bytes(fdes, 2)
giadr["DETECTOR4_BIAS_VOLTAGE_COEFFICIENT5"] = read_bytes(fdes, 2)
giadr["DETECTOR5_BIAS_VOLTAGE_COEFFICIENT1"] = read_bytes(fdes, 2)
giadr["DETECTOR5_BIAS_VOLTAGE_COEFFICIENT2"] = read_bytes(fdes, 2)
giadr["DETECTOR5_BIAS_VOLTAGE_COEFFICIENT3"] = read_bytes(fdes, 2)
giadr["DETECTOR5_BIAS_VOLTAGE_COEFFICIENT4"] = read_bytes(fdes, 2)
giadr["DETECTOR5_BIAS_VOLTAGE_COEFFICIENT5"] = read_bytes(fdes, 2)
giadr["CH3B_BLACKBODY_VIEW_COEFFICIENT1"] = read_bytes(fdes, 2)
giadr["CH3B_BLACKBODY_VIEW_COEFFICIENT2"] = read_bytes(fdes, 2)
giadr["CH3B_BLACKBODY_VIEW_COEFFICIENT3"] = read_bytes(fdes, 2)
giadr["CH3B_BLACKBODY_VIEW_COEFFICIENT4"] = read_bytes(fdes, 2)
giadr["CH3B_BLACKBODY_VIEW_COEFFICIENT5"] = read_bytes(fdes, 2)
giadr["CH4_BLACKBODY_VIEW_COEFFICIENT1"] = read_bytes(fdes, 2)
giadr["CH4_BLACKBODY_VIEW_COEFFICIENT2"] = read_bytes(fdes, 2)
giadr["CH4_BLACKBODY_VIEW_COEFFICIENT3"] = read_bytes(fdes, 2)
giadr["CH4_BLACKBODY_VIEW_COEFFICIENT4"] = read_bytes(fdes, 2)
giadr["CH4_BLACKBODY_VIEW_COEFFICIENT5"] = read_bytes(fdes, 2)
giadr["CH5_BLACKBODY_VIEW_COEFFICIENT1"] = read_bytes(fdes, 2)
giadr["CH5_BLACKBODY_VIEW_COEFFICIENT2"] = read_bytes(fdes, 2)
giadr["CH5_BLACKBODY_VIEW_COEFFICIENT3"] = read_bytes(fdes, 2)
giadr["CH5_BLACKBODY_VIEW_COEFFICIENT4"] = read_bytes(fdes, 2)
giadr["CH5_BLACKBODY_VIEW_COEFFICIENT5"] = read_bytes(fdes, 2)
giadr["REFERENCE_VOLTAGE_COEFFICIENT1"] = read_bytes(fdes, 2)
giadr["REFERENCE_VOLTAGE_COEFFICIENT2"] = read_bytes(fdes, 2)
giadr["REFERENCE_VOLTAGE_COEFFICIENT3"] = read_bytes(fdes, 2)
giadr["REFERENCE_VOLTAGE_COEFFICIENT4"] = read_bytes(fdes, 2)
giadr["REFERENCE_VOLTAGE_COEFFICIENT5"] = read_bytes(fdes, 2)
return giadr
def read_veadr(fdes, grh, metadata):
"""Read VEADR.
"""
veadr = {}
field_name, field_val = read_ascii_field(fdes, grh["RECORD_SIZE"] - 20)
veadr[field_name] = field_val
return veadr
def read_mdr(fdes, grh, metadata):
"""Read MDR.
"""
if grh["RECORD_SUBCLASS"] != 2:
raise ValueError("Only l1b supported for now")
return read_mdr_1b(fdes, grh, metadata)
def read_mdr_1b(fdes, grh, metadata):
"""Read MDR section, 1B type.
"""
mdr = {}
mdr["DEGRADED_INST_MDR"] = read_u_bytes(fdes, 1)
mdr["DEGRADED_PROC_MDR"] = read_u_bytes(fdes, 1)
mdr["EARTH_VIEWS_PER_SCANLINE"] = read_bytes(fdes, 2)
scanlength = mdr["EARTH_VIEWS_PER_SCANLINE"]
array = (np.fromfile(file = fdes, dtype = ">i2", count = scanlength * 5) *
10 ** -2)
array = array.reshape(5, scanlength)
array[2, :] *= 10 ** -2
mdr["SCENE_RADIANCES"] = array
# Channels 1, 2, 3a in units of W/(m^2.sr).
# Channels 3b, 4, 5 in units of mW/(m^2.sr.cm^-1).
# Channels 1, 2, 4 & 5 with scale factor = 2.
# Channels 3a or 3b with scale factor = 4.
mdr["TIME_ATTITUDE"] = read_u_bytes(fdes, 4)
mdr["EULER_ANGLE"] = (read_bytes(fdes, 2), read_bytes(fdes, 2),
read_bytes(fdes, 2))
mdr["NAVIGATION_STATUS"] = read_bitstring(fdes, 4)
mdr["SPACECRAFT_ALTITUDE"] = read_u_bytes(fdes, 4)
mdr["ANGULAR_RELATIONS_FIRST"] = (read_bytes(fdes, 2), read_bytes(fdes, 2),
read_bytes(fdes, 2), read_bytes(fdes, 2))
mdr["ANGULAR_RELATIONS_LAST"] = (read_bytes(fdes, 2), read_bytes(fdes, 2),
read_bytes(fdes, 2), read_bytes(fdes, 2))
mdr["EARTH_LOCATION_FIRST"] = np.array((read_bytes(fdes, 4, -4),
read_bytes(fdes, 4, -4)))
mdr["EARTH_LOCATION_LAST"] = np.array((read_bytes(fdes, 4, -4),
read_bytes(fdes, 4, -4)))
mdr["NUM_NAVIGATION_POINTS"] = read_bytes(fdes, 2)
mdr["ANGULAR_RELATIONS"] = np.fromfile(file = fdes, dtype = ">i2",
count = 412) * 10 ** -2
mdr["EARTH_LOCATIONS"] = np.fromfile(file = fdes, dtype = ">i4",
count = 206) * 10 ** -4
mdr["QUALITY_INDICATOR"] = read_bitstring(fdes, 4)
mdr["SCAN_LINE_QUALITY"] = read_bitstring(fdes, 4)
mdr["CALIBRATION_QUALITY"] = (read_bitstring(fdes, 2),
read_bitstring(fdes, 2),
read_bitstring(fdes, 2))
mdr["COUNT_ERROR_FRAME"] = read_u_bytes(fdes, 2)
mdr["CH123A_CURVE_SLOPE1"] = (read_bytes(fdes, 4),
read_bytes(fdes, 4),
read_bytes(fdes, 4))
mdr["CH123A_CURVE_INTERCEPT1"] = (read_bytes(fdes, 4),
read_bytes(fdes, 4),
read_bytes(fdes, 4))
mdr["CH123A_CURVE_SLOPE2"] = (read_bytes(fdes, 4),
read_bytes(fdes, 4),
read_bytes(fdes, 4))
mdr["CH123A_CURVE_INTERCEPT2"] = (read_bytes(fdes, 4),
read_bytes(fdes, 4),
read_bytes(fdes, 4))
mdr["CH123A_CURVE_INTERCEPTION"] = (read_bytes(fdes, 4),
read_bytes(fdes, 4),
read_bytes(fdes, 4))
mdr["CH123A_TEST_CURVE_SLOPE1"] = (read_bytes(fdes, 4),
read_bytes(fdes, 4),
read_bytes(fdes, 4))
mdr["CH123A_TEST_CURVE_INTERCEPT1"] = (read_bytes(fdes, 4),
read_bytes(fdes, 4),
read_bytes(fdes, 4))
mdr["CH123A_TEST_CURVE_SLOPE2"] = (read_bytes(fdes, 4),
read_bytes(fdes, 4),
read_bytes(fdes, 4))
mdr["CH123A_TEST_CURVE_INTERCEPT2"] = (read_bytes(fdes, 4),
read_bytes(fdes, 4),
read_bytes(fdes, 4))
mdr["CH123A_TEST_CURVE_INTERCEPTION"] = (read_bytes(fdes, 4),
read_bytes(fdes, 4),
read_bytes(fdes, 4))
mdr["CH123A_PRELAUNCH_CURVE_SLOPE"] = (read_bytes(fdes, 4),
read_bytes(fdes, 4),
read_bytes(fdes, 4))
mdr["CH123A_PRELAUNCH_CURVE_INTERCEPT1"] = (read_bytes(fdes, 4),
read_bytes(fdes, 4),
read_bytes(fdes, 4))
mdr["CH123A_PRELAUNCH_CURVE_SLOPE2"] = (read_bytes(fdes, 4),
read_bytes(fdes, 4),
read_bytes(fdes, 4))
mdr["CH123A_PRELAUNCH_CURVE_INTERCEPT2"] = (read_bytes(fdes, 4),
read_bytes(fdes, 4),
read_bytes(fdes, 4))
mdr["CH123A_PRELAUNCH_CURVE_INTERCEPTION"] = (read_bytes(fdes, 4),
read_bytes(fdes, 4),
read_bytes(fdes, 4))
mdr["CH3B45_SECOND_TERM"] = (read_bytes(fdes, 4),
read_bytes(fdes, 4),
read_bytes(fdes, 4))
mdr["CH3B45_FIRST_TERM"] = (read_bytes(fdes, 4),
read_bytes(fdes, 4),
read_bytes(fdes, 4))
mdr["CH3B45_ZEROTH_TERM"] = (read_bytes(fdes, 4),
read_bytes(fdes, 4),
read_bytes(fdes, 4))
mdr["CH3B45_TEST_SECOND_TERM"] = (read_bytes(fdes, 4),
read_bytes(fdes, 4),
read_bytes(fdes, 4))
mdr["CH3B45_TEST_FIRST_TERM"] = (read_bytes(fdes, 4),
read_bytes(fdes, 4),
read_bytes(fdes, 4))
mdr["CH3B45_TEST_ZEROTH_TERM"] = (read_bytes(fdes, 4),
read_bytes(fdes, 4),
read_bytes(fdes, 4))
mdr["CLOUD_INFORMATION"] = np.fromfile(file = fdes, dtype = "<i2",
count = scanlength)
mdr["FRAME_SYNCHRONISATION"] = (read_u_bytes(fdes, 2),
read_u_bytes(fdes, 2),
read_u_bytes(fdes, 2),
read_u_bytes(fdes, 2),
read_u_bytes(fdes, 2),
read_u_bytes(fdes, 2))
mdr["FRAME_INDICATOR"] = (read_bitstring(fdes, 2), read_bitstring(fdes, 2))
mdr["TIME_CODE"] = (read_bitstring(fdes, 2), read_bitstring(fdes, 2),
read_bitstring(fdes, 2), read_bitstring(fdes, 2))
mdr["RAMP_CALIB"] = (read_bitstring(fdes, 2), read_bitstring(fdes, 2),
read_bitstring(fdes, 2), read_bitstring(fdes, 2),
read_bitstring(fdes, 2))
mdr["INTERNAL_TARGET_TEMPERATURE_COUNT"] = (read_bitstring(fdes, 2),
read_bitstring(fdes, 2),
read_bitstring(fdes, 2))
# Digital B telemetry
mdr["INSTRUMENT_INVALID_WORD_FLAG"] = read_bitstring(fdes, 2)
mdr["DIGITAL_B_DATA"] = read_bitstring(fdes, 2)
# Analog housekeeping data
mdr["INSTRUMENT_INVALID_ANALOG_WORD_FLAG"] = read_bitstring(fdes, 4)
mdr["PATCH_TEMPERATURE"] = read_u_bytes(fdes, 2)
mdr["PATCH_EXTENDED_TEMPERATURE"] = read_u_bytes(fdes, 2)
mdr["PATCH_POWER"] = read_u_bytes(fdes, 2)
mdr["RADIATOR_TEMPERATURE"] = read_u_bytes(fdes, 2)
mdr["BLACKBODY_TEMPERATURE1"] = read_u_bytes(fdes, 2)
mdr["BLACKBODY_TEMPERATURE2"] = read_u_bytes(fdes, 2)
mdr["BLACKBODY_TEMPERATURE3"] = read_u_bytes(fdes, 2)
mdr["BLACKBODY_TEMPERATURE4"] = read_u_bytes(fdes, 2)
mdr["ELECTRONIC_CURRENT"] = read_u_bytes(fdes, 2)
mdr["MOTOR_CURRENT"] = read_u_bytes(fdes, 2)
mdr["EARTH_SHIELD_POSITION"] = read_u_bytes(fdes, 2)
mdr["ELECTRONIC_TEMPERATURE"] = read_u_bytes(fdes, 2)
mdr["COOLER_HOUSING_TEMPERATURE"] = read_u_bytes(fdes, 2)
mdr["BASEPLATE_TEMPERATURE"] = read_u_bytes(fdes, 2)
mdr["MOTOR_HOUSING_TEMPERATURE"] = read_u_bytes(fdes, 2)
mdr["AD_CONVERTER_TEMPERATURE"] = read_u_bytes(fdes, 2)
mdr["DETECTOR4_VOLTAGE"] = read_u_bytes(fdes, 2)
mdr["DETECTOR5_VOLTAGE"] = read_u_bytes(fdes, 2)
mdr["CH3_BLACKBODY_VIEW"] = read_u_bytes(fdes, 2)
mdr["CH4_BLACKBODY_VIEW"] = read_u_bytes(fdes, 2)
mdr["CH5_BLACKBODY_VIEW"] = read_u_bytes(fdes, 2)
mdr["REFERENCE_VOLTAGE"] = read_u_bytes(fdes, 2)
return mdr
C1 = 1.191062e-05 # mW/(m2*sr*cm-4)
C2 = 1.4387863 # K/cm-1
def to_bt(arr, wc_, a__, b__):
"""Convert to BT.
"""
val = np.log(1 + (C1 * (wc_ ** 3) / arr))
t_star = C2 * wc_ / val
return a__ + b__ * t_star
def to_refl(arr, solar_flux):
"""Convert to reflectances.
"""
return arr * math.pi * 100.0 / solar_flux
def calibrate(channels, info_giadr):
"""convert the radiances to reflectances and bts.
"""
channels[0, :, :] = to_refl(channels[0, :, :],
info_giadr["CH1_SOLAR_FILTERED_IRRADIANCE"])
channels[1, :, :] = to_refl(channels[1, :, :],
info_giadr["CH2_SOLAR_FILTERED_IRRADIANCE"])
channels[2, :, :] = to_refl(channels[2, :, :],
info_giadr["CH3A_SOLAR_FILTERED_IRRADIANCE"])
channels[3, :, :] = to_bt(channels[3, :, :],
info_giadr["CH3B_CENTRAL_WAVENUMBER"],
info_giadr["CH3B_CONSTANT1"],
info_giadr["CH3B_CONSTANT2_SLOPE"])
channels[4, :, :] = to_bt(channels[4, :, :],
info_giadr["CH4_CENTRAL_WAVENUMBER"],
info_giadr["CH4_CONSTANT1"],
info_giadr["CH4_CONSTANT2_SLOPE"])
channels[5, :, :] = to_bt(channels[5, :, :],
info_giadr["CH5_CENTRAL_WAVENUMBER"],
info_giadr["CH5_CONSTANT1"],
info_giadr["CH5_CONSTANT2_SLOPE"])
def read(fdes):
"""Read the entire file.
"""
metadata = {}
cnt = 0
channels = None
lons = None
lats = None
samples = None
geo_samples = 0
scanlength = 0
g3a = False
g3b = False
while True:
grh = read_grh(fdes)
if grh == "EOF":
break
record_class = grh["RECORD_CLASS"]
if record_class not in CASES:
raise NotImplementedError
res = CASES[grh["RECORD_CLASS"]](fdes, grh, metadata)
if record_class == "SPHR":
scanlength = metadata["EARTH_VIEWS_PER_SCANLINE"]
llats = np.zeros((MAX_SCAN_LINES, scanlength))
llons = np.zeros((MAX_SCAN_LINES, scanlength))
channels = np.ma.ones((6, MAX_SCAN_LINES, scanlength),
dtype = np.float) * np.infty
geo_samples = np.round(scanlength / metadata["NAV_SAMPLE_RATE"]) + 3
samples = np.zeros(geo_samples, dtype=np.intp)
samples[1:-1] = np.arange(geo_samples - 2) * 20 + 5 - 1
samples[-1] = scanlength - 1
lats = np.zeros((MAX_SCAN_LINES, geo_samples))
lons = np.zeros((MAX_SCAN_LINES, geo_samples))
if record_class == "GIADR" and grh["RECORD_SUBCLASS"] == 1:
info_giadr = res
if record_class == "MDR":
three_a = get_bit(res["FRAME_INDICATOR"][0], 0)
if three_a:
channels[0:3, cnt, :] = res["SCENE_RADIANCES"][0:3]
channels[4:, cnt, :] = res["SCENE_RADIANCES"][3:]
g3a = True
else:
channels[0:2, cnt, :] = res["SCENE_RADIANCES"][0:2]
channels[3:, cnt, :] = res["SCENE_RADIANCES"][2:]
g3b = True
lats[cnt, 1:-1] = res["EARTH_LOCATIONS"]\
[np.arange(geo_samples - 2) * 2]
lats[cnt, 0] = res["EARTH_LOCATION_FIRST"][0]
lats[cnt, -1] = res["EARTH_LOCATION_LAST"][0]
lons[cnt, 1:-1] = res["EARTH_LOCATIONS"]\
[np.arange(geo_samples - 2) * 2 + 1]
lons[cnt, 0] = res["EARTH_LOCATION_FIRST"][1]
lons[cnt, -1] = res["EARTH_LOCATION_LAST"][1]
# unwraping datum shift line
lons[cnt, :] = np.rad2deg(np.unwrap(np.deg2rad(lons[cnt, :])))
xnew = np.arange(scanlength)
tck = interpolate.splrep(samples, lats[cnt, :], s=0)
llats[cnt, :] = interpolate.splev(xnew, tck, der=0)
tck = interpolate.splrep(samples, lons[cnt, :], s=0)
llons[cnt, :] = interpolate.splev(xnew, tck, der=0)
cnt += 1
channels = channels[:, :cnt, :]
llats = llats[:cnt, :]
llons = llons[:cnt, :]
llons[llons>180] -= 360
llons[llons<-180] += 360
calibrate(channels, info_giadr)
return channels, llats, llons, g3a, g3b, metadata["ORBIT_START"]
CASES = {"MPHR": read_mphr,
"SPHR": read_sphr,
"IPR": read_ipr,
"GEADR": read_geadr,
"GIADR": read_giadr,
"VEADR": read_veadr,
"MDR": read_mdr}
EPSILON = 0.001
def load(satscene):
"""Read data from file and load it into *satscene*.
"""
conf = ConfigParser()
conf.read(os.path.join(CONFIG_PATH, satscene.fullname + ".cfg"))
options = {}
for option, value in conf.items(satscene.instrument_name + "-level2",
raw = True):
options[option] = value
LOAD_CASES[satscene.instrument_name](satscene, options)
def load_avhrr(satscene, options):
"""Read avhrr data from file and load it into *satscene*.
"""
if "filename" not in options:
raise IOError("No filename given, cannot load.")
values = {"INSTRUMENT": satscene.instrument_name[:4].upper(),
"FNAME": satscene.satname[0].upper() + satscene.number
}
filename = os.path.join(
options["dir"],
(satscene.time_slot.strftime(options["filename"])%values))
LOG.debug("Looking for file %s"%satscene.time_slot.strftime(filename))
file_list = glob.glob(satscene.time_slot.strftime(filename))
if len(file_list) > 1:
raise IOError("More than one l1b file matching!")
elif len(file_list) == 0:
raise IOError("No l1b file matching!")
try:
fdes = open(file_list[0])
channels, lats, lons, g3a, g3b, orbit = read(fdes)
finally:
fdes.close()
channels = np.ma.masked_invalid(channels)
satscene["1"] = channels[0, :, :]
satscene["2"] = channels[1, :, :]
satscene["4"] = channels[4, :, :]
satscene["5"] = channels[5, :, :]
if g3a:
satscene["3A"] = channels[2, :, :]
if g3b:
satscene["3B"] = channels[3, :, :]
print "Inside eps_avhrr.load_avhrr: orbit = ", orbit
#satscene.orbit = str(int(orbit) + 1)
satscene.orbit = str(int(orbit))
try:
from pyresample import geometry
satscene.area = geometry.SwathDefinition(lons=lons, lats=lats)
except ImportError:
satscene.area = None
satscene.lat = lats
satscene.lon = lons
def get_lonlat(satscene, row, col):
try:
if (satscene.area is None and
(satscene.lat is None or satscene.lon is None)):
load(satscene)
except AttributeError:
load(satscene)
try:
return satscene.area.lons[row, col], satscene.area.lats[row, col]
except AttributeError:
return satscene.lon[row, col], satscene.lat[row, col]
def get_lat_lon(satscene, resolution):
"""Read lat and lon.
"""
del resolution
return LAT_LON_CASES[satscene.instrument_name](satscene, None)
def get_lat_lon_avhrr(satscene, options):
"""Read lat and lon.
"""
del options
return satscene.lat, satscene.lon
LAT_LON_CASES = {
"avhrr": get_lat_lon_avhrr
}
LOAD_CASES = {
"avhrr": load_avhrr
}
if __name__ == "__main__":
pass
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