-
Notifications
You must be signed in to change notification settings - Fork 285
/
acspo.py
155 lines (130 loc) · 5.41 KB
/
acspo.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (c) 2017 Satpy developers
#
# This file is part of satpy.
#
# satpy 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.
#
# satpy 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
# satpy. If not, see <http://www.gnu.org/licenses/>.
"""ACSPO SST Reader.
See the following page for more information:
https://podaac.jpl.nasa.gov/dataset/VIIRS_NPP-OSPO-L2P-v2.3
"""
import logging
from datetime import datetime
import numpy as np
from satpy.readers.netcdf_utils import NetCDF4FileHandler
LOG = logging.getLogger(__name__)
ROWS_PER_SCAN = {
'MODIS': 10,
'VIIRS': 16,
'AVHRR': None,
}
class ACSPOFileHandler(NetCDF4FileHandler):
"""ACSPO L2P SST File Reader."""
@property
def platform_name(self):
"""Get satellite name for this file's data."""
res = self['/attr/platform']
if isinstance(res, np.ndarray):
return str(res.astype(str))
return res
@property
def sensor_name(self):
"""Get instrument name for this file's data."""
res = self['/attr/sensor']
if isinstance(res, np.ndarray):
return str(res.astype(str))
return res
def get_shape(self, ds_id, ds_info):
"""Get numpy array shape for the specified dataset.
Args:
ds_id (DataID): ID of dataset that will be loaded
ds_info (dict): Dictionary of dataset information from config file
Returns:
tuple: (rows, cols)
"""
var_path = ds_info.get('file_key', '{}'.format(ds_id['name']))
if var_path + '/shape' not in self:
# loading a scalar value
shape = 1
else:
shape = self[var_path + '/shape']
if len(shape) == 3:
if shape[0] != 1:
raise ValueError("Not sure how to load 3D Dataset with more than 1 time")
shape = shape[1:]
return shape
@staticmethod
def _parse_datetime(datestr):
return datetime.strptime(datestr, "%Y%m%dT%H%M%SZ")
@property
def start_time(self):
"""Get first observation time of data."""
return self._parse_datetime(self['/attr/time_coverage_start'])
@property
def end_time(self):
"""Get final observation time of data."""
return self._parse_datetime(self['/attr/time_coverage_end'])
def get_metadata(self, dataset_id, ds_info):
"""Collect various metadata about the specified dataset."""
var_path = ds_info.get('file_key', '{}'.format(dataset_id['name']))
shape = self.get_shape(dataset_id, ds_info)
units = self[var_path + '/attr/units']
info = getattr(self[var_path], 'attrs', {})
standard_name = self[var_path + '/attr/standard_name']
resolution = float(self['/attr/spatial_resolution'].split(' ')[0])
rows_per_scan = ROWS_PER_SCAN.get(self.sensor_name) or 0
info.update(dataset_id.to_dict())
info.update({
'shape': shape,
'units': units,
'platform_name': self.platform_name,
'sensor': self.sensor_name,
'standard_name': standard_name,
'resolution': resolution,
'rows_per_scan': rows_per_scan,
'long_name': self.get(var_path + '/attr/long_name'),
'comment': self.get(var_path + '/attr/comment'),
})
return info
def get_dataset(self, dataset_id, ds_info):
"""Load data array and metadata from file on disk."""
var_path = ds_info.get('file_key', '{}'.format(dataset_id['name']))
metadata = self.get_metadata(dataset_id, ds_info)
shape = metadata['shape']
file_shape = self[var_path + '/shape']
metadata['shape'] = shape
valid_min = self[var_path + '/attr/valid_min']
valid_max = self[var_path + '/attr/valid_max']
# no need to check fill value since we are using valid min/max
scale_factor = self.get(var_path + '/attr/scale_factor')
add_offset = self.get(var_path + '/attr/add_offset')
data = self[var_path]
data = data.rename({"ni": "x", "nj": "y"})
if isinstance(file_shape, tuple) and len(file_shape) == 3:
# can only read 3D arrays with size 1 in the first dimension
data = data[0]
data = data.where((data >= valid_min) & (data <= valid_max))
if scale_factor is not None:
data = data * scale_factor + add_offset
if ds_info.get('cloud_clear', False):
# clear-sky if bit 15-16 are 00
clear_sky_mask = (self['l2p_flags'][0] & 0b1100000000000000) != 0
clear_sky_mask = clear_sky_mask.rename({"ni": "x", "nj": "y"})
data = data.where(~clear_sky_mask)
data.attrs.update(metadata)
# Remove these attributes since they are no longer valid and can cause invalid value filling.
data.attrs.pop('_FillValue', None)
data.attrs.pop('valid_max', None)
data.attrs.pop('valid_min', None)
return data