title: how to map netcdf data ob base map
body: <p>file contains values of echos w.r.t to lat/long, I have to plot complete range of echos over base map.</p>
  
  <pre><code>from netCDF4 import Dataset
  import numpy as np
  import pandas as pd
  from google.colab import files
  upload = files.upload()
  my_example_nc_file = 'a.nc'
  fh = Dataset(my_example_nc_file, mode='r')
  lons = fh.variables['longitude'][:]
  lats = fh.variables['latitude'][:]
  ech= fh.variables['echos'][:]
  
  from mpl_toolkits.basemap import Basemap
  import matplotlib.pyplot as plt
  %matplotlib inline
  m = Basemap(width=5000000,height=3500000,
          resolution='l',projection='stere',\
          lat_ts=40,lat_0=lat_0,lon_0=lon_0)
  
  xi, yi = m(lons, lats)
  #simple plot
  #m.plot(xi, yi, 'co')
  m.scatter(rge,yi, marker = 'o', color='r', zorder=5)
  </code></pre>
  
  <p>Current code execute below results.</p>
  
  <p><a href="https://i.stack.imgur.com/ZK6q4.png" rel="nofollow noreferrer">enter image description here</a>
  I want to plot total echos with variation represented by colors as presented in below screen short</p>
  
  <p><a href="https://i.stack.imgur.com/bAXr5.png" rel="nofollow noreferrer">enter image description here</a></p>