root/sodar/trunk/sodar/arrayData.py

#!/usr/bin/python
"""
Module to handle sodar data samples as arrays.
"""

__author__ = 'Chris Calloway'
__email__ = 'cbc@unc.edu'
__copyright__ = 'Copyright 2007 UNC-CH Department of Marine Science'
__license__ = 'GPL2'

import rawData
import formattedData
import numpy as n
from numpy import matrix
import datetime

class ArrayData(object):
    
    """Class to handle Daily sodar file data as arrays."""
    
    def __init__(self, data):
        """Create arrays from formatted data."""
        super(ArrayData, self).__init__()
        self.beginStamp = data.beginStamp
        self.endStamp = data.endStamp
        self.numIntervals = data.numIntervals
        self.timeInterval = data.timeInterval
        self.altInterval = data.altInterval
        self.numAltitudes = data.numAltitudes
        self.minAltitude = data.minAltitude
        self.maxAltitude = data.maxAltitude
        self._thetas(data)
        self._uComponents(data)
        self._vComponents(data)
        self._wComponents(data)
        self._echoStrengths(data)
    
    def _thetas(self, data):
        """Convert direction to polar azimuth in radians CW from North"""
        self.thetas = n.pi * (n.array(data.thetas()) / 180.0)
    
    def _uComponents(self,data):
        """Compute u component array"""
        self.uComponents = n.array(data.radials()) * n.sin(self.thetas)
    
    def _vComponents(self,data):
        """Compute v component array"""
        self.vComponents = n.array(data.radials()) * n.cos(self.thetas)
    
    def _wComponents(self,data):
        """Create w component array"""
        self.wComponents = n.array(data.wComponents())
    
    def _echoStrengths(self,data):
        """Create an echo strength array"""
        self.echoStrengths = n.array(data.echoStrengths())


def _main():
    """Process as script from command line."""
    import urllib2
    try:
        rawDataHandle = urllib2.urlopen('http://nemo.isis.unc.edu/'\
                                        'data/nccoos/level0/ims/sodar/'\
                                        '2008_01/20080101.dat')
        rawDataString = rawDataHandle.read()
        rawDataHandle.close()
    except:
        raise IOError("Failure to read raw test data")
    rawDataObject = rawData.RawData(rawDataString)
    formattedDataObject = formattedData.FormattedData(rawDataObject)
    arrayDataObject = ArrayData(formattedDataObject)
    
    import pylab as p
    
    home = '/var/www/html/sodar/plots/'
    
    fig = p.figure()
    p.pcolor(arrayDataObject.uComponents.T)
    p.colorbar()
    fig.savefig(home + 'uComponents.png')
    
    fig = p.figure()
    p.pcolor(arrayDataObject.vComponents.T)
    p.colorbar()
    fig.savefig(home + 'vComponents.png')
    
    fig = p.figure()
    p.pcolor(arrayDataObject.wComponents.T)
    p.colorbar()
    fig.savefig(home + 'wComponents.png')

    fig = p.figure()
    p.pcolor(arrayDataObject.echoStrengths.T)
    p.colorbar()
    fig.savefig(home + 'echoStrengths.png')

    fig = p.figure()
    p.quiver(arrayDataObject.uComponents,
             arrayDataObject.vComponents,
             arrayDataObject.wComponents)
    p.colorbar()
    xmin,xmax,ymin,ymax = p.axis()
    dx,dy = xmax-xmin, ymax-ymin
    p.axis([xmin-0.1*dx, xmax+0.1*dx, ymin-0.1*dy, ymax+0.1*dy])
    p.title('Horizontal wind vectors: time vs. altitude')
    fig.savefig(home + 'quiver.png')

if __name__ == "__main__":
    _main()