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mapper_globcolour_l3m.py
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mapper_globcolour_l3m.py
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# Name: mapper_globcolour_l3m
# Purpose: Mapping for L3 mapped GLOBCOLOUR data
# Authors: Anton Korosov
# Licence: This file is part of NANSAT. You can redistribute it or modify
# under the terms of GNU General Public License, v.3
# http://www.gnu.org/licenses/gpl-3.0.html
from __future__ import unicode_literals, print_function, division
import datetime
import os.path
import glob
import numpy as np
from nansat.vrt import VRT
from nansat.mappers.globcolour import Globcolour
from nansat.tools import gdal, ogr
from nansat.exceptions import WrongMapperError
class Mapper(VRT, Globcolour):
"""Mapper for GLOBCOLOR L3M products"""
def __init__(self, filename, gdalDataset, gdalMetadata, **kwargs):
''' GLOBCOLOR L3M VRT '''
try:
print("=>%s<=" % gdalMetadata['NC_GLOBAL#title'])
except (TypeError, KeyError):
raise WrongMapperError
if 'GlobColour' not in gdalMetadata['NC_GLOBAL#title']:
raise WrongMapperError
# get list of similar (same date) files in the directory
iDir, iFile = os.path.split(filename)
iFileName, iFileExt = os.path.splitext(iFile)
print('idir:', iDir, iFile, iFileName[0:30], iFileExt[0:8])
simFilesMask = os.path.join(iDir, iFileName[0:30] + '*.nc')
simFiles = glob.glob(simFilesMask)
print('simFilesMask, simFiles', simFilesMask, simFiles)
metaDict = []
for simFile in simFiles:
print('simFile', simFile)
# open file, get metadata and get parameter name
simSupDataset = gdal.Open(simFile)
simSubDatasets = simSupDataset.GetSubDatasets()
simWKV = None
for simSubDataset in simSubDatasets:
if '_mean' in simSubDataset[0]:
simValidSupDataset = simSupDataset
simGdalDataset = gdal.Open(simSubDataset[0])
simBand = simGdalDataset.GetRasterBand(1)
simBandMetadata = simBand.GetMetadata()
simVarname = simBandMetadata['NETCDF_VARNAME']
# get WKV
print(' simVarname', simVarname)
if simVarname in self.varname2wkv:
simWKV = self.varname2wkv[simVarname]
break
# skipp adding this similar file if it is not valid
if simWKV is None:
continue
metaEntry = {
'src': {'SourceFilename': simSubDataset[0],
'SourceBand': 1},
'dst': {'wkv': simWKV, 'original_name': simVarname}}
# add wavelength and name
longName = simBandMetadata['long_name']
if 'Fully normalised water leaving radiance' in longName:
simWavelength = simVarname.split('L')[1].split('_mean')[0]
metaEntry['dst']['suffix'] = simWavelength
metaEntry['dst']['wavelength'] = simWavelength
# add band with rrsw
metaEntry2 = None
if simWKV == 'surface_upwelling_spectral_radiance_in_air_emerging_from_sea_water':
solarIrradiance = simBandMetadata['solar_irradiance']
metaEntry2 = {'src': metaEntry['src']}
metaEntry2['dst'] = {'wkv': 'surface_ratio_of_upwelling_radiance_emerging_from_sea'
'_water_to_downwelling_radiative_flux_in_water',
'suffix': simWavelength,
'wavelength': simWavelength,
# 'expression': 'self["nLw_%s"] / %s / (0.52 + 1.7 * self["nLw
# _%s"] / %s)' % (simWavelength, solarIrradiance,
# simWavelength, solarIrradiance),
'expression': 'self["nLw_%s"] / %s' %
(simWavelength, solarIrradiance)
}
print(' metaEntry', metaEntry)
metaDict.append(metaEntry)
if metaEntry2 is not None:
print(' metaEntry2', metaEntry2)
metaDict.append(metaEntry2)
print('simSubDatasets', simValidSupDataset.GetSubDatasets())
for simSubDataset in simValidSupDataset.GetSubDatasets():
print('simSubDataset', simSubDataset)
if '_flags ' in simSubDataset[1]:
print(' mask simSubDataset', simSubDataset[1])
flags = gdal.Open(simSubDataset[0]).ReadAsArray()
mask = np.ones(flags.shape) * 64
mask[np.bitwise_and(flags, np.power(2, 0)) > 0] = 1
mask[np.bitwise_and(flags, np.power(2, 3)) > 0] = 2
self.band_vrts = {'maskVRT': VRT(array=mask)}
metaDict.append(
{'src': {'SourceFilename': self.band_vrts['maskVRT'].filename,
'SourceBand': 1},
'dst': {'name': 'mask'}})
# create empty VRT dataset with geolocation only
simGdalDataset.SetProjection('GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,'
'298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG",'
'"6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],'
'UNIT["degree",0.01745329251994328,AUTHORITY["EPSG","9122"]],'
'AUTHORITY["EPSG","4326"]]')
self._init_from_gdal_dataset(simGdalDataset)
# add bands with metadata and corresponding values to the empty VRT
self.create_bands(metaDict)
# Add valid time
startYear = int(gdalMetadata['Start Year'])
startDay = int(gdalMetadata['Start Day'])
# Adding valid time to dataset
self.dataset.SetMetadataItem('time_coverage_start',
(datetime.datetime(startYear, 1, 1) + datetime.timedelta(startDay)).isoformat())
self.dataset.SetMetadataItem('time_coverage_end',
(datetime.datetime(startYear, 1, 1) + datetime.timedelta(startDay)).isoformat())