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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (c) 2010, 2011, 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 AAPP level 1b format. Uses the AHAMAP reader.
"""
import glob
import os.path
from ConfigParser import ConfigParser
import math
import numpy as np
from mpop import CONFIG_PATH
from mpop.satin.logger import LOG
# Using ahamap: FIXME!
EPSILON = 0.001
def load(satscene, *args, **kwargs):
"""Read data from file and load it into *satscene*.
"""
del args, kwargs
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
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.")
chns = satscene.channels_to_load & set(["1", "2", "3A", "3B", "4", "5"])
if len(chns) == 0:
return
values = {"orbit": satscene.orbit,
"satname": satscene.satname,
"number": satscene.number,
"instrument": satscene.instrument_name,
"satellite": satscene.fullname
}
filename = os.path.join(satscene.time_slot.strftime(options["dir"])%values,
satscene.time_slot.strftime(options["filename"])
%values)
file_list = glob.glob(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!: "+
filename)
filename = file_list[0]
LOG.debug("Loading from " + filename)
import avhrr # AHAMAP module
avh = avhrr.avhrr(filename)
avh.get_unprojected()
instrument_data = avh.build_raw()
available_channels = set([])
data_channels = {}
for chn in instrument_data.data:
channel_name = chn.info.info["channel_id"][3:].upper()
available_channels |= set([channel_name])
data_channels[channel_name] = chn.data
for chn in satscene.channels_to_load:
if chn in available_channels:
if chn in ["1", "2", "3A"]:
gain = instrument_data.info["vis_gain"]
intercept = instrument_data.info["vis_intercept"]
units = "%"
else:
gain = instrument_data.info["ir_gain"]
intercept = instrument_data.info["ir_intercept"]
units = "K"
chn_array = np.ma.array(data_channels[chn])
missing_data = instrument_data.info["missing_data"]
chn_array = np.ma.masked_inside(chn_array,
missing_data - EPSILON,
missing_data + EPSILON)
no_data = instrument_data.info["nodata"]
chn_array = np.ma.masked_inside(chn_array,
no_data - EPSILON,
no_data + EPSILON)
satscene[chn] = chn_array
satscene[chn].data = np.ma.masked_less(satscene[chn].data *
gain +
intercept,
0)
satscene[chn].info['units'] = units
else:
LOG.warning("Channel "+str(chn)+" not available, not loaded.")
# Compulsory global attribudes
satscene.info["title"] = (satscene.satname.capitalize() + satscene.number +
" satellite, " +
satscene.instrument_name.capitalize() +
" instrument.")
satscene.info["institution"] = "Original data disseminated by EumetCast."
satscene.add_to_history("HRIT/LRIT data read by mipp/mpop.")
satscene.info["references"] = "No reference."
satscene.info["comments"] = "No comment."
lons = instrument_data.londata / math.pi * 180
lats = instrument_data.latdata / math.pi * 180
try:
from pyresample import geometry
satscene.area = geometry.SwathDefinition(lons=lons, lats=lats)
except ImportError:
satscene.area = None
satscene.lat = lats
satscene.lon = lons
CASES = {
"avhrr": load_avhrr
}
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