Re: [arts-users] A question about scattering database extraction

2022-02-28 Thread Patrick Eriksson 

Dear Song shuhua,

You have discovered one of the reasons why we created the standard 
habits. It is difficult to run DDA on the large particles at high 
frequencies, and we had a limit at size parameter = 10. This means that 
the highest frequencies not are present for all particles.


In the standard habits we assume fill in frequency by simply copy the 
results from the highest existing frequency. An extrapolation is risky, 
and this gives a conservative solution.


So if you want to use the database directly you need to consider this 
question. If I remember it correctly, there are some function(s) in the 
interface to handle this. But there are for sure more ways to handle this.


Bye,

Patrick






On 2022-02-28 10:27, 宋淑华 wrote:

Dear all,

Hello! I met a problem when I was using ARTS's scattering database.

I used a matlab program named demo_ssp4arts.m in DataInterfaces to 
convert the scattering data of LargePlateAggregate_Id20 particles in the 
database from nc format to the format used internally by ARTS. The 
results of the data transformation are given in the attachment. Next, I 
imported the extracted scattering data into the ARTS development version 
(arts-2.5.0). Then when simulating the brightness temperature of 664GHz, 
the problem shown in the image below occurred. But when I used the 
corresponding scattering data from StandardHabits directly, this problem 
didn't arise. I was confused, is the scattering data I extracted wrong? 
I’d appreciate it if you could help me look at this extracted scattering 
data.


Looking forward to your replies and suggestions.


Best Regards,

Song shuhua




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**
scat_data.xml.bin 
 
(66MB, 2022年03月15日 17:25 到期)
查看下载信息 
 



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[arts-users] A question about scattering database extraction

2022-02-28 Thread 宋淑华 
Dear all,

Hello! I met a problem when I was using ARTS's scattering database.

I used a matlab program named demo_ssp4arts.m in DataInterfaces to convert the 
scattering data of LargePlateAggregate_Id20 particles in the database from nc 
format to the format used internally by ARTS. The results of the data 
transformation are given in the attachment. Next, I imported the extracted 
scattering data into the ARTS development version (arts-2.5.0). Then when 
simulating the brightness temperature of 664GHz, the problem shown in the image 
below occurred. But when I used the corresponding scattering data from 
StandardHabits directly, this problem didn't arise. I was confused, is the 
scattering data I extracted wrong? I’d appreciate it if you could help me look 
at this extracted scattering data.

Looking forward to your replies and suggestions.




Best Regards,

Song shuhua

demo_ssp4arts.m
Description: Binary data






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"Meta data for Snowflake aggregate, shape files from Evans 2012"


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"Meta data for Snowflake aggregate, shape files from Evans 2012"


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"Meta data for Snowflake aggregate, shape files from Evans 2012"


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"Meta data for Snowflake aggregate, shape files from Evans 2012"


"Evans 2012."


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"Meta data for Snowflake aggregate, shape files from Evans 2012"


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