Issues using the CDS API in Python

Koen_Hufkens · 11 October 2024 21:10

The CDS and ADS endpoints are different, this causes the error. Sadly and confusingly so, they are set by the same file. Meaning you have to switch between them using session variables. A solution is provided here. Note that this exposes your key. I think you can just set the url, but you should cross reference the source code or ask the devs.

Reading along the source code of the python package here:

github.com

ecmwf/cdsapi/blob/9b162d6b093b80283a672203b384c2a67cb35a8b/cdsapi/api.py#L48


      
              config = {}
              with open(path) as f:
                  for line in f.readlines():
                      if ":" in line:
                          k, v = line.strip().split(":", 1)
                          if k in ("url", "key", "verify"):
                              config[k] = v.strip()
              return config
          
          
          def get_url_key_verify(url, key, verify):
              if url is None:
                  url = os.environ.get("CDSAPI_URL")
              if key is None:
                  key = os.environ.get("CDSAPI_KEY")
              dotrc = os.environ.get("CDSAPI_RC", os.path.expanduser("~/.cdsapirc"))
          
              if url is None or key is None:
                  if os.path.exists(dotrc):
                      config = read_config(dotrc)

You see that you can set the url and key separate.

Keep you key in your .cdsapirc file only change the url using:

os.environ['CDSAPI_URL'] = 'https://ads.atmosphere.copernicus.eu/api'