Download some datasets

1.10. Download some datasets#

Note

Python API used here are included in conda environnement croco_pyenv

1.10.1. Download Glorys dataset#

download_glorys_data_copernicus_cli.py allows to download dataset from CMEMS website using the new Copernicus Marine API. Further informations on the API is given here: https://help.marine.copernicus.eu/en/articles/7949409-copernicus-marine-toolbox-introduction

A CMEMS account is needed in order to retreive the data. Your login and password are asked each time you want to use this script.

This script takes advantage of “subset” function of copernicusmarine API which allows to download a subset of the original files.

Warning

When using subset functionnality, dataset is converted to Analysis-Ready Cloud-Optimized (ARCO) format. Data are the same, except for time variable where date is centered at midnight instead of noon for original files. For more intel on the difference between netcdf and ARCO format go to this page

To use download_glorys_data_copernicus_cli.py, USER CHANGES section needs to be filled

  • Dates:

    Ystart,Mstart = 2013,1 # Starting month
Yend,Mend = 2013,3    # Ending month

Representing the starting and ending month of you simulation

  • Product informations:

    product_id = 'cmems_mod_glo_phy_my_0.083deg_P1M-m'
variables = ["zos","uo","vo","thetao","so"]
multi_files = False

The desired product type is specified with product_id along the variables you want to download. In case of large dataset, multi_files option allows to put each variable in its own netcdf.

List of all the product is available on Copernicus website but here a list of common used datasets:

Dai9ly Reanalysis

cmems_mod_glo_phy_my_0.083deg_P1D-m

Monthly Reanalysis

cmems_mod_glo_phy_my_0.083deg_P1M-m

Daily Analysis and Forecast

cmems_mod_glo_phy_anfc_0.083deg_P1D-m

  • CROCO informations:

    croco_dir = '../'
croco_grd = 'croco_grd.nc'

  • Output informations:

    output_dir = './GLORYS_DATA/'
output_prefix = 'glo12-reana-daily'

After completing all fields, lauch the script:

python doawnload_glorys_data_copernicus_cli.py

Login and password will be asked and data downloaded on put inside output_dir.

1.10.2. Download river discharge#

download_glofas_river.py makes possible to download data for rivers discharges. Data are stored on Climate Data Store website It uses CDS API <for data request for data request.

Note

Follow instructions on CDS API to create the file $HOME/.cdsapirc This file should contains your login and parssword informations

River discharge can be found here and is retreive from the Global Flood Awareness System (GloFAS).

Note

User also need to have CDO to convert grib to netcdf format

To use download_glofas_river.py, USER CHANGES section needs to be filled:

  • Dates:

    Ystart,Mstart = 2013,1 # Starting month
Yend,Mend = 2013,3    # Ending month

Representing the starting and ending month of you simulation

  • Product informations:

    product_id = 'cems-glofas-historical'

Other dataset of interest can be found on the website, look around and just put the desired product_id

CROCO informations:
croco_dir = '../'
croco_grd = 'croco_grd.nc'

  • Output informations:

    convert2netcdf = True
output_dir = './DATA_RIVER/'
output_name = 'cems_glofas'

If convert2netcdf is set to False data will be in grib format and no conversion is done.

To use this script use the command:

python download_glofas_river.py