Dear Patrick,
The different colors line indicate the different frequency of the channels.It
is 87,88.5,89.5,91GHz for channel-1(pic1 and pic2),and
118.66,118.68,118.82,118.84GHz for channel-2(pic3 and pic4),and
118.5,118.6,118.9,119GHz for channel-3(pic5 and pic6).The Ts is got from the
WriteXML iy in the surface rtp agenda of fastem which is write as:
AgendaSet( iy_surface_agenda ){
#specular_losCalc
#Extract(wind_direction,specular_los,0)
NumericSet(wind_direction,0)
Extract( surface_skin_t, sst_vec, 0 )
iySurfaceFastem( surface_skin_t=surface_skin_t,salinity=salinity,
wind_speed=wind_speed, wind_direction=wind_direction,fastem_version=3 )
WriteXMLIndexed("ascii",forloop_index,iy)
}
and transfer to Planck BT.
The trans is calculated from iy_aux_vars, ["Optical depth"]) with the
equation of trans=-exp(Optical depth).
and the Td is equals to Tup and calculated by setting the sensor_pos as
Z_surface and sensor_los is the same as down look from the satellite.
The direct simulation of arts with different incident angle is calculated by
setting the sensor_pos as satellite's altitude and line scanned angle as
sensor_los.
I have not include any sensor_response and the stokes dim I set is 2,I
calculate the quasi_v and quasi_h polarization with
Tv=I+Q;Th=I-Q;Tv'=Tv*cos(theta)^2+Th*sin(theta)^2;The Unit is planck bt.
Thank you again and best regards to you!
Huang Yingzhu
> -----原始邮件-----
> 发件人: "Patrick Eriksson" <[email protected]>
> 发送时间: 2015年8月11日 星期二
> 收件人: "黄莹珠" <[email protected]>, [email protected]
> 抄送:
> 主题: Re: [arts-users] Fw: some question about multiple sensor_los simulation
> using arts
>
> Dear Huang Yingzhu,
>
> Sorry, but I don't understand the figures at all. For example, what are
> the different colours? You need to describe in detail how you have done
> the calculations. How do you extract the terms Ts, trans and Td. What do
> you compare Ts*trans+Td to? Do you include any sensor? What stokes_dim?
> And so on ... Include as much information as possible.
>
> Kind regards,
>
> Patrick
>
> On 08/10/15 04:19, 黄莹珠 wrote:
> > Dear Patrick,
> > pic 1 and pic 2 is a couple,which pic 1 is the results of
> > the equation of Ts*trans+Td I mentioned.and pic 2 is the results of
> > direct simulation of arts with different incident angle.
> > the pic 1 is the same results with the MPM93 model.
> >
> > pic 3 and pic 4 is a couple.which pic 3 is the results of
> > the equation of Ts*trans+Td I mentioned.and pic 4 is the results of
> > direct simulation of arts with different incident angle.
> >
> > pic 5 and pic 6 is a couple.which pic 5 is the results of
> > the equation of Ts*trans+Td I mentioned.and pic 6 is the results of
> > direct simulation of arts with different incident angle.
> >
> > Best regards,
> > Huang Yingzhu
> >
> > > -----原始邮件-----
> > > 发件人: "Patrick Eriksson" <[email protected]>
> > > 发送时间: 2015年8月4日 星期二
> > > 收件人: "黄莹珠" <[email protected]>, [email protected]
> > > 抄送:
> > > 主题: Re: [arts-
> > users] Fw: some question about multiple sensor_los simulation using arts
> > >
> > > Dear Huang Yingzhu,
> > >
> > > Back from vacations today.
> > >
> > > I don't know what to comment. You need to give us more details. What
> > > other models are you using? How big are the differences? Can you be more
> > > precise about how you compare the models? Particularly, how do you
> > > handle V and H polarisation? Can you send some figures?
> > >
> > > Kind regards,
> > >
> > > Patrick
> > >
> > >
> > >
> > > On 07/31/15 05:28, 黄莹珠 wrote:
> > > > Dear Patrick,
> > > >
> > > > This email I send you before your vocation,and I still have no answer
> > of
> > > > that.So I send you again and waiting for your reply.
> > > >
> > > >
> > > > Yes,it is very funny.If I set the surface as blackbody, the results is
> > > > the same as other models.But if I set the surface as iyFastem, the
> > > > results is changed.
> > > > And I record the iyFastem's iy results, and calculated the download Td
> > > > and transmition respectively.and I use the equation of Ts*trans+Td,then
> > > > the results is the same as the total Tb the sensor received above the
> > > > atmosphere that calculated by the other models.
> > > >
> > > > Why?
> > > >
> > > > Thank you again and best regards!
> > > >
> > > > Huang Yingzhu
> > > >
> > > >
> > > > > -----原始邮件-----
> > > > > 发件人: "Patrick Eriksson" <[email protected]_
> > > > <mailto:[email protected]>>
> > > > > 发送时间: 2015年6月17日 星期三
> > > > > 收件人: "黄莹珠" <[email protected]_
> > > > <mailto:[email protected]>>, [email protected]_
> > > > <mailto:[email protected]>
> > > > > 抄送:
> > > > > 主题: Re: [arts-
> > > > users] Fw: some question about multiple sensor_los simulation using
> > arts
> > > > >
> > > > > Dear Huang Yingzhu,
> > > > >
> > > > > The Ppath structure is described carefully in the ARTS user guide
> > (AUG).
> > > > > In the latest version it is section:
> > > > >
> > > > > 10.5 The propagation path data structure
> > > > >
> > > > > but if you use arts v2.2 the section number is different.
> > > > >
> > > > > Note that "start" here means the start of the propagation path, at
> > the
> > > > > surface, not at the sensor. That is, e.g. lat=10 means that the
> > surface
> > > > > intersection is 10 degrees away from the sensor (for 1D).
> > > > >
> > > > > For window channels, how the Tb varies with zenith angle depends
> > > > > critically on the surface emission. Do you use the same surface
> > > > > emissivity in the different models?
> > > > >
> > > > > Best regards,
> > > > >
> > > > > Patrick
> > > > >
> > > > >
> > > > >
> > > > > On 06/17/15 08:17, 黄莹珠 wrote:
> > > > > >
> > > > > >
> > > > > >
> > > > > > -----原始邮件-----
> > > > > > *发件人:* "黄莹珠" <[email protected]_
> > > > <mailto:[email protected]>>
> > > > > > *发送时间:* 2015年6月16日 星期二
> > > > > > *收件人:* [email protected]_
> > > > <mailto:[email protected]>
> > > > > > *抄送:*
> > > > > > *主
> > 题:* some question about multiple sensor_los simulation using arts
> > > > > >
> > > > > > Hi, all
> > > > > > I am confused that I use arts to simulate the multiple sensor_los
> > > > > > of the measurement in microwave channels. The simulated
> > Temperature
> > > > > > brightness of windows channel such as 89GHz is bigger when the
> > > > > > sensor_los is 180 then the one of the sensor_los is 126.5.see
> > attached pic.
> > > > > > It different from the results simulated by the other models.
> > > > > > when I check the ppath of them I find the start pos have a
> > latitude of
> > > > > > 10 when the sensor_los is 126.65 but the latitude is 0 when the
> > > > > > sensor_los is 180 , like follows:
> > > > > >
> > > > > > <?xml version="1.0"?>
> > > > > > <arts format="ascii" version="1">
> > > > > > <Ppath><Index name="AtmosphericDimensionality">1</Index>
> > > > > > <Index name="NumberOfPositionInPropagationPath">669</Index>
> > > > > > <Numeric name="PropagationPathConstant">69249.3251344851</Numeric>
> > > > > > <String name="RadiativeBackground">"surface"</String>
> > > > > > <Vector name="StartPositionOfPropagationPath" nelem="2">
> > > > > > 0
> > > > > > 0.0720929145706464
> > > > > > </Vector>
> > > > > > <Vector name="StartLOSOfPropagationPath" nelem="1">
> > > > > > 179.378097497658
> > > > > > </Vector>
> > > > > > <Numeric name="StartLstepOfPropagationPath">0</Numeric>
> > > > > > <Matrix name="PropagationPathPointPositions" nrows="669"
> > ncols="2">
> > > > > > 63965.423084626 0.0659158935548021
> > > > > > 63865.4288625289 0.0659254544247858
> > > > > > 63765.4346406078 0.0659350155916627
> > > > > > 63665.4404188674 0.0659445770553191
> > > > > > 63565.4461973086 0.0659541388158118
> > > > > > 63465.4519759286 0.0659637008731693
> > > > > > 63365.4577547302 0.0659732632273631
> > > > > > 63265.4635337079 0.0659828258784501
> > > > > > 63165.4693128662 0.0659923888264871
> > > > > > 63065.4750922015 0.0660019520713888
> > > > > > 62965.4808717147 0.066011515613269
> > > > > > 62865.4866514094 0.0660210794520424
> > > > > > 62765.4924312793 0.0660306435875668
> > > > > >
> > > > > > <?xml version="1.0"?>
> > > > > > <arts format="ascii" version="1">
> > > > > > <Ppath><Index name="AtmosphericDimensionality">1</Index>
> > > > > > <Index name="NumberOfPositionInPropagationPath">821</Index>
> > > > > > <Numeric name="PropagationPathConstant">5788170.73405349</Numeric>
> > > > > > <String name="RadiativeBackground">"surface"</String>
> > > > > > <Vector name="StartPositionOfPropagationPath" nelem="2">
> > > > > > -488.411979784258
> > > > > > 11.822568283672
> > > > > > </Vector>
> > > > > > <Vector name="StartLOSOfPropagationPath" nelem="1">
> > > > > > 114.827431716328
> > > > > > </Vector>
> > > > > > <Numeric name="StartLstepOfPropagationPath">0</Numeric>
> > > > > > <Matrix name="PropagationPathPointPositions" nrows="821"
> > ncols="2">
> > > > > > 80520.0870012585 10.3120928628466
> > > > > > 80412.9346699752 10.3140130944758
> > > > > > 80305.789593217 10.3159333898205
> > > > > > 80198.6517713424 10.3178537488795
> > > > > > 80091.5212047147 10.3197741716519
> > > > > > 79984.3978936942 10.3216946581362
> > > > > > 79877.2818386406 10.3236152083316
> > > > > > 79780.5901730424 10.3253490196361
> > > > > > 79683.904421174 10.3270828828595
> > > > > >
> > > > > > what does them means?who can help me.Thank you!
> > > > > >
> > > > > > Huang Yingzhu
> > > > > >
> > > > > >
> > > > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > _______________________________________________
> > > > arts-users mailing list
> > > > [email protected]
> > > > https://www.sat.ltu.se/mailman/listinfo/arts-users
> > > >
> >
> >
> >
_______________________________________________
arts-users mailing list
[email protected]
https://www.sat.ltu.se/mailman/listinfo/arts-users
