[teqc] Re: about "missed obs" on TEQC report

Francisco Javier Simón del Monte fjsimon at gmv.com
Wed Jul 21 01:46:28 MDT 2010


Dear Lou,

Thanks for your answer that is perfectly understood.

Regars,
Simón


Francisco Javier Simón del Monte
Ingeniero de Telecomunicación
Unidad de Negocio GNSS
M. Sc. Telecommunications Engineering
GNSS Business Unit


GMV AEROSPACE 
AND DEFENCE, S.A.
Isaac Newton, 11
P.T.M. Tres Cantos
E-28760 Madrid
Tel. +34 91 807 76 91
Fax +34 91 807 21 99
www.gmv.com



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De: teqc-bounces at ls.unavco.org [mailto:teqc-bounces at ls.unavco.org] En nombre de teqc-request at ls.unavco.org
Enviado el: viernes, 16 de julio de 2010 20:00
Para: teqc at ls.unavco.org
Asunto: teqc Digest, Vol 76, Issue 3

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Today's Topics:

   1. Re: about "missed obs" on TEQC report (Lou Estey)


----------------------------------------------------------------------

Message: 1
Date: Fri, 16 Jul 2010 07:42:35 -0600
From: Lou Estey <lou at unavco.org>
Subject: Re: [teqc] about "missed obs" on TEQC report
To: teqc <teqc at ls.unavco.org>
Message-ID: <4C4061CB.8070307 at unavco.org>
Content-Type: text/plain; charset=windows-1252; format=flowed

All,

I received a few comments that users felt that "missed obs" was a confusing
label.  Fair enough.  When this was added a year+ ago, I was focusing on new
functionality that seemed useful (and otherwise not available) and not the
labeling.  But to improve labeling, it would certainly be better to refer to
these as something like "masked obs" and reverse the angle condition in the
message, e.g. the tidb qc that Sim?n was showing would then be:

Possible obs >  10.0 deg:  20244
Complete obs >  10.0 deg:  14473
  Deleted obs >  10.0 deg:    347
   Masked obs <  10.0 deg:   5072

That's a bit clearer.  I'll make this change, unless anyone has a better
suggestion.

cheers,
--lou

On 7/15/2010 10:41 AM, Lou Estey wrote:
> Dear Sim?n,
>
>> I would like to know how the field ?Missed obs? in the TEQC+qc report is
>> computed. In the attached TEQC+qc report it does not happen that:
>>
>> Possible obs = complete obs + missed obs + deleted obs
>>
>> as one would probably expect. I have been able to understand how the
>> fields ?Possible obs?, ?complete obs? and ?deleted obs? from the TEQC-qc
>> report are computed, but this is not the case for ?missed obs?. Could
>> you please tell me how is ?Missed obs? exactly computed?
>
> No, "missed obs" is not that at all. I will admit that the current
> labeling in the qc summary is pretty confusing, as in your attached
> file shows:
>
> Possible obs > 10.0 deg: 20244
> Complete obs > 10.0 deg: 14473
> Missed obs > 10.0 deg: 5072
> Deleted obs > 10.0 deg: 347
>
> "Missed obs" as added in 7 Mar 2009 (see
> http://facility.unavco.org/software/teqc/log.html ) and is
> related to the discrepancy lines '-dn' and '+dn':
>
> -dn| ++++++++ + ++ 11211 + ++++++ ++++ +122243433444444465556765588888 |-dn
> +dn| 1 51 3 525713412 4 5 2 1 21411123344444445554468688777688888881|+dn
>
> See all those '+' values on the '-dn' line? That's telling you that
> there is good data below 10 degrees (which is the default value for
> the cutoff mask for the qc). The "missed obs" count is the actual
> number of obs below the cutoff mask, i.e. you've "missed" using them
> in the qc if you keep the cutoff mask as is. If you lower the mask value
> (using the '-set_mask #' option), then the '+'s on the '-dn' line
> should become reduced in number and as should the "missed obs" count.
>
> What you where thinking of is ... "totally absent obs"?
>
> absent obs = possible obs - complete obs - deleted obs
>
> You can compute this yourself using the values provided, where
> this is, like the rest, dependent on the cutoff mask angle.
>
> cheers,
> --lou
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Louis H. Estey, Ph.D. office: [+001] 303-381-7456
> UNAVCO, 6350 Nautilus Drive FAX: [+001] 303-381-7451
> Boulder, CO 80301-5554 e-mail: lou unavco.org
> WWW: http://www.unavco.org http://jules.unavco.org
>
> "If the universe is the answer, what is the question?"
> -- Leon Lederman
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


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