This program gets ocean codar data from http://tds.marine.rutgers.edu:8080/thredds/catalog.html .
Some processes combined with drifter data.
User should cheak or modify control file 'getcodar_bydrifter_ctl.txt' or 'getcodar_byrange_ctl.txt' before running the process.
A picture would be generated after you running a process.
getcodar_drifter.py plot raw drifter and codar data in a picture
getcodar.py plot codar data
getsst_codar_drifter.py plot raw drifter, codar and observed sst in a picture
getsst_codar.py plot observed sst and codar in a picture
gettrack_codar.py according codar data , estimate a drifter track