#+STARTUP: showall

#+TITLE:     Class 14: python - processing GPS data
#+AUTHOR:    Kurt Schwehr
#+EMAIL:     schwehr@ccom.unh.edu
#+DATE:      <2011-10-18 Tue>
#+DESCRIPTION: Marine Research Data Manipulation and Practices
#+KEYWORDS: ipython matplotlib
#+LANGUAGE:  en
#+OPTIONS:   H:3 num:nil toc:t \n:nil @:t ::t |:t ^:t -:t f:t *:t <:t
#+OPTIONS:   TeX:t LaTeX:nil skip:t d:nil todo:t pri:nil tags:not-in-toc
#+INFOJS_OPT: view:nil toc:nil ltoc:t mouse:underline buttons:0 path:http://orgmode.org/org-info.js
#+LINK_HOME: http://vislab-ccom.unh.edu/~schwehr/Classes/2011/esci895-researchtools/


* TODO Outside reading                                              :reading:

http://oceanservice.noaa.gov/podcast.html

#+BEGIN_VERSE 
Figuring out the exact location of a point on the Earth's surface in
three dimensions is what the science of geodesy is all about. Thanks
to the network of satellites in space known as the Global Positioning
System, we can determine latitude and longitude with great
accuracy. Heights, however, are a trickier business to nail down. 

In this episode, we talk with NOAA Chief Geodesist Dru Smith to learn
how scientists are using measurements of gravity to refine a complex
mathematical model of the Earth's shape known as the geoid. Once the
new model is deployed, the hope is that we'll be able to use GPS
receivers to figure out our current elevation in most places across
the nation within an accuracy of two centimeters or less.
#+END_VERSE

- http://oceanservice.noaa.gov/podcast/oct11/mw101311.mp3
- http://oceanservice.noaa.gov/podcast/oct11/mw101311transcript.html


* Introduction

Today we will work on parsing GPS data

My normal log files have extra metadata on the end.  Let's start with
a file that does not include this metadata.

#+BEGIN_SRC sh
mkdir ~/class/14
cd ~/class/14
wget http://vislab-ccom.unh.edu/~schwehr/Classes/2011/esci895-researchtools/examples/nmea.log.bz2
bunzip2 nmea.log.bz2
#+END_SRC

more notes will follow later.  This class is very similar to video 13.