FAQ

• How to setup Python for using NAAD direct access (DAP)
• How to use direct access (DAP) in Python: Examples

How to setup Python for using NAAD direct access (DAP)

You need to install Pydap, requests and lxml in your Python environment (if not installed already):
# pip install Pydap requests lxml

How to use direct access (DAP) in Python: Example

To get direct access to the NAAD, you need to connect to the server first. It can be accomplished by using setup_session from the pydap library. To get the file handler, use setup_session from the same library. So the final code will look like:

from pydap.client import open_url
from pydap.cas.get_cookies import setup_session

# connect to the NAAD database
session = setup_session("https://naad.ocean.ru/accounts/login/",
	username="USER_NAME",
	password="USER_PASSWORD"
	)

# get the file handler
dataset = open_url('https://naad.ocean.ru/dapserver/LoRes/Invariants/NAAD77km_isor.nc',
	session=session)

# read the variable
var = dataset['isor']

# print the array sizes
print(var.shape)

Here we accessed the NAAD database, read the static variable isor from the NAAD LoRes dataset and printed the shape of the array.