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Merge pull request #81 from cgq-qgc/add_code_to_download_solar_rad_data
PR: Add code to download, format and extract solar radiation data from CDS
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# -*- coding: utf-8 -*- | ||
""" | ||
A Script to download solar radiation data from CDS. | ||
https://cds.climate.copernicus.eu/cdsapp#!/dataset/sis-agrometeorological-indicators?tab=overview | ||
""" | ||
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# https://pypi.org/project/cdsapi/ | ||
# https://github.com/ecmwf/cdsapi | ||
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from __future__ import annotations | ||
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import os.path as osp | ||
import cdsapi | ||
import netCDF4 | ||
import numpy as np | ||
import pandas as pd | ||
import zipfile | ||
import datetime | ||
import re | ||
import tempfile | ||
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def read_zipped_solrad_netcdf(path_to_zip: str, bbox: list): | ||
""" | ||
Read solar radiation data from a zip archive. | ||
""" | ||
with zipfile.ZipFile(path_to_zip) as thezip: | ||
namelist = thezip.namelist() | ||
namelist.sort() | ||
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time = [] | ||
datastack = [] | ||
for filename in namelist: | ||
time.append( | ||
datetime.datetime.strptime( | ||
re.findall('AgERA5_(.*?)_final', filename)[0], '%Y%m%d')) | ||
with thezip.open(filename, mode='r') as thefile: | ||
with netCDF4.Dataset( | ||
'dummy', mode='r', memory=thefile.read()) as nc: | ||
dataf = pd.DataFrame( | ||
data=np.array(nc['Solar_Radiation_Flux'])[0, :, :], | ||
index=np.array(nc['lat']), | ||
columns=np.array(nc['lon'])) | ||
mask_index = ( | ||
(dataf.index <= bbox[1]) & | ||
(dataf.index >= bbox[3])) | ||
mask_columns = ( | ||
(dataf.columns >= bbox[0]) & | ||
(dataf.columns <= bbox[2])) | ||
dataf = dataf.loc[mask_index, mask_columns] | ||
datastack.append(dataf.values) | ||
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data = np.stack(datastack, axis=0) | ||
time = np.array(time) | ||
lat = dataf.index.values | ||
lon = dataf.columns.values | ||
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return data, time, lat, lon | ||
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def save_solrad_to_nc(filename: str, data: np.ndarray, time: np.ndarray, | ||
lat: np.ndarray, lon: np.ndarray): | ||
""" | ||
Save a year of solar radiation data to a netcdf file. | ||
""" | ||
with netCDF4.Dataset(filename, 'w', format="NETCDF4") as ncfile: | ||
ncfile.year = time[0].year | ||
ncfile.source = "https://doi.org/10.24381/cds.6c68c9bb" | ||
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ncfile.createDimension('time', len(time)) | ||
ncfile.createDimension('lat', len(lat)) | ||
ncfile.createDimension('lon', len(lon)) | ||
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var_time = ncfile.createVariable('time', 'f4', ('time',)) | ||
var_lat = ncfile.createVariable('lat', 'f8', ('lat',)) | ||
var_lon = ncfile.createVariable('lon', 'f8', ('lon',)) | ||
var_solrad = ncfile.createVariable( | ||
'solrad', 'f8', ('time', 'lat', 'lon',)) | ||
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var_time.unit = 'day of year' | ||
var_lat.unit = 'decimal degrees' | ||
var_lon.unit = 'decimal degrees' | ||
var_solrad.unit = 'MJ m-2 day-1' | ||
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var_solrad.description = ( | ||
"Total amount of energy provided by solar radiation at " | ||
"the surface over the period 00-24h local time per unit " | ||
"area and time.") | ||
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var_lat[:] = lat | ||
var_lon[:] = lon | ||
var_time[:] = np.arange(1, len(time) + 1) | ||
var_solrad[:] = data | ||
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def get_solrad_data(year: int, bbox: list[float, float, float, float], | ||
filename: str = None): | ||
""" | ||
Get a year of solar radiation data from CDS. | ||
Parameters | ||
---------- | ||
year : int | ||
The year for which to download the solar radiation data. | ||
bbox : list[float, float, float, float] | ||
The bounding box within which to extract the data. The first element | ||
corresponds to the westernmost longitude of the bbox, the second to | ||
the northernmost latitude, the third to the easternmost longitude, and | ||
the fourth to the southernmost latitude. | ||
filename: str | ||
A string corresponding to a netCDF file path where to save the data. | ||
Returns | ||
------- | ||
data : np.ndarray | ||
A 3D numpy matrix containing the daily solar radiation data, where | ||
axes 0 corresponds to the time, axes 1 to the latitude and axes 2 to | ||
the longitude. | ||
time : np.ndarray | ||
A 1D array containing the time of the data. | ||
lat : np.ndarray | ||
A 1D array containing the latitudes of the data. | ||
lon : np.ndarray | ||
A 1D array containing the longitudes of the data. | ||
""" | ||
with tempfile.TemporaryDirectory() as tmpdir: | ||
zippath = osp.join(tmpdir, 'download.zip') | ||
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timestack = [] | ||
datastack = [] | ||
cds = cdsapi.Client() | ||
for month in range(1, 13): | ||
cds.retrieve( | ||
'sis-agrometeorological-indicators', | ||
{"variable": "solar_radiation_flux", | ||
"year": ['{:0.0f}'.format(year)], | ||
'month': ['{0:02.0f}'.format(month)], | ||
"day": ['{0:02.0f}'.format(day) for day in range(1, 32)], | ||
"format": "zip"}, | ||
zippath) | ||
data, time, lat, lon = read_zipped_solrad_netcdf(zippath, bbox) | ||
timestack.append(time) | ||
datastack.append(data) | ||
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data = np.vstack(datastack) | ||
time = np.hstack(timestack) | ||
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# Convert solar radiation data to MJ/m2/day (from J/m2/day). | ||
data = data / 10**6 | ||
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if filename: | ||
save_solrad_to_nc(filename, data, time, lat, lon) | ||
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return data, time, lat, lon | ||
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if __name__ == '__main__': | ||
year = 2018 | ||
filename_pattern = 'solar_radiation_flux_{year}.nc' | ||
savedir = 'C:/Users/jean-/Documents/Data/CDS_Solar_Radiation_Flux' | ||
savefile = osp.join(savedir, filename_pattern.format(year=year)) | ||
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data, time, lat, lon = get_solrad_data( | ||
year=year, | ||
bbox=[-81, 63, -55, 44], | ||
filename=savefile) | ||
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from grid_data_extractor import GridExtractor | ||
grid_extractor = GridExtractor( | ||
gridpath=savedir, | ||
filename_pattern=filename_pattern, | ||
varname='solrad' | ||
) | ||
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loc_id = ['loc1', 'loc2', 'loc3'] | ||
lat_dd = [45.42571, 49.1564, 45.43753] | ||
lon_dd = [-73.0764, -68.24755, -73.0813] | ||
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connect_table = grid_extractor.create_connect_table( | ||
lat_dd, lon_dd, loc_id) | ||
solrad_data = grid_extractor.get_data( | ||
connect_table, first_year=2019, last_year=2019) | ||
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print(solrad_data) | ||
print() | ||
print(connect_table) | ||
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# connect_table.save_to_csv('connect_table.csv') | ||
# solrad_data.save_to_csv('solrad_data_2019.csv') |
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