def extract_trend(inp, cells):
import trend
records = iter(gio.SubboxReader(inp))
meta = records.next()
base_year = meta.yrbeg
name = inp.name
csv_name = name + '.csv'
with open(csv_name, 'w') as csv_out:
csv_file = csv.writer(csv_out)
for record,box in itertools.izip(records, cells):
assert record.first_year == base_year
series = record.series[-360:]
data = [(i//12, v) for i, v in enumerate(series) if v != MISSING]
(a, b, r2) = trend.lm1(data)
csv_file.writerow([id11(box), b])
if b is None:
b = MISSING
else:
b *= 100
yield b, box
def convert(inp, out):
"""Convert a file inp from subbox to V2 mean format."""
# Clear Climate Code
from code import eqarea
v2 = gio.GHCNV2Writer(file=out, scale=0.01)
subbox = iter(gio.SubboxReader(inp))
# First record is metadata, which we ignore.
subbox.next()
for record in subbox:
lat, lon = eqarea.centre(record.box)
record.uid = '%+05.1f%+06.1fC' % (lat, lon)
v2.write(record)
v2.close()
def to_ghcnm(inp):
"""
Convert a file inp from subbox to GHCN-M (v3) format.
"""
import sys
out = sys.stdout
w = gio.GHCNV3Writer(file=out)
subbox = iter(gio.SubboxReader(inp))
# First record is metadata, which we ignore.
subbox.next()
for record in subbox:
record.uid = id11(record.box)
w.write(record)
w.close()
def extractdate(inp, cells, date):
"""*date* should be a string in ISO 8601 format: 'YYYY-MM'. From
the binary subbox file *inp* extract the values corresponding to the
date box by box.
"""
year, month = map(int, date.split('-'))
records = iter(gio.SubboxReader(inp))
meta = records.next()
base_year = meta.yrbeg
# Index of required month in the record series.
i = (year - base_year) * 12 + month - 1
for record, box in itertools.izip(records, cells):
assert record.first_year == base_year
if i >= len(record.series):
yield MISSING, box
else:
yield record.series[i], box
