##########################  Notebooks  ##########################
1. Data filtering
http://nbviewer.ipython.org/github/stream101/bigdata_final/blob/master/NCDC%20data%20filtering.ipynb

2. Global trend
http://nbviewer.ipython.org/github/stream101/bigdata_final/blob/master/02_Global_Trend.ipynb

3. US weather 1930-2008 and Beijing weather 1976-2008
http://nbviewer.ipython.org/github/stream101/bigdata_final/blob/master/US_Beijing_weather.ipynb


#########################  Available data  ######################
1. global_info: 
   -Global avg temp, tmax, tmin and visib data from 1930 to 2008
2. us80: 
   - US average temperature and visibility from 1930 to 2008
3. valid_station_year.csv
   - valid staion, followed by a list of valid year
4. station_merge.csv: 
   - valid station, country, state, lat, lon, list of valid years
5. hotmap: 
   - temperature and visibility change from 1988 to 2008
-