#!/usr/bin/env python
# coding: utf-8

# In[1]:


import xarray as xr


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url = 'http://gamone.whoi.edu/thredds/dodsC/coawst_4/use/fmrc/coawst_4_use_best.ncd'


# In[3]:


ds = xr.open_dataset(url)


# In[4]:


ds['h']


# In[5]:


ds['foo'] = ds['h']


# In[6]:


ds['foo'].values = ds['h'].values * 2


# In[7]:


ds['foo'][10,10].values


# In[8]:


ds['h'][10,10].values


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