Changes between Initial Version and Version 1 of FAQ/bandwidth


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Timestamp:
May 28, 2010 10:46:35 AM (12 years ago)
Author:
benj
Comment:

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  • FAQ/bandwidth

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     1'''Q: What are the bandwidths/band centres of my data?'''
     2
     3'''A:'''
     4
     5For Eagle and Hawk data, the easiest way to obtain these is from the associated header files. These can be read using any text editor and contain both the bandwidth and band-centre information for the file. Note that although one of the items is labelled "FWHM", this is misleading - the numbers actually give the bandwidth of each band, '''not''' the full-width-half-maximum.
     6
     7For ATM you can obtain the band information from the ARSF website at http://arsf.nerc.ac.uk/instruments/atm.asp
     8
     9CASI's bandset is variable (and unlike Eagle and Hawk it doesn't come with header files), so it is necessary to extract the information from the HDF (you can also do this for Eagle, Hawk and ATM if you want to). The information is held in the "CAwavc" and "CAwavh" VData items, holding respectively the band-centre and bandwidth information for the file.
     10
     11You can view these with azexhdf using the following commands:
     12
     13azexhdf -h <input_file> -hd CAwavc -v 999[[BR]]
     14azexhdf -h <input_file> -hd CAwavh -v 999
     15
     16...replacing <input_file> with the name of the file you're interested in.
     17
     18[wiki:FAQ Back to FAQ]