NRAO Home > CASA > CASA Toolkit Reference Manual
atmosphere.getDispersivePathLength - Function

4.1.1 get the integrated Atmospheric Dispersive Path


Description

Retrieve the integrated Atmospheric Path length (Dispersive part) along the atmospheric path corresponding to the user water column for channel nc in spectral window spwid.

Arguments





Inputs

nc

Channel number (0-based; defaults to reference channel)

allowed:

int

Default:

-1

spwid

Int standing for spectral window id (0-based). The value must be >= 0.

allowed:

int

Default:

0

Returns
Quantity

Example

 
 
w = at.getUserWH2O()  
nb = 1  
fC = qa.quantity([850.0], ’GHz’)  
fW = qa.quantity([0.5], ’GHz’)  
nfR = qa.quantity([0.5], ’GHz’)  
at.initSpectralWindow(nb, fC, fW, fR)  
print "Total Dispersive Delay at ", fC[’value’][0], fC[’unit’], " for 1.0 air mass: ",\  
      at.getDispersivePathLength()[’value’][0] /  w[’value’][0], " meters per mm of water vapor"  
print "(",100*(at.getDispersivePathLength()[’value’][0] /  w[’value’][0])/(at.getNonDispersivePathLength()[’value’][0] / w[’value’][0]),\  
      "% of the Non-dispersive one )"  
 
 

__________________________________________________________________


More information about CASA may be found at the CASA web page

Copyright 2016 Associated Universities Inc., Washington, D.C.

This code is available under the terms of the GNU General Public Lincense


Home | Contact Us | Directories | Site Map | Help | Privacy Policy | Search