# Is there coefficients for FY-3C &FY-3D radiometer MWRI?

**URL:** <https://forums.jcsda.org/t/is-there-coefficients-for-fy-3c-fy-3d-radiometer-mwri/227>\
**Category:** CRTM\
**Created:** [November 21, 2021, 3:39pm UTC](https://forums.jcsda.org/t/is-there-coefficients-for-fy-3c-fy-3d-radiometer-mwri/227 "2021-11-21T15:39:11Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![scstriker](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.jcsda.org/scstriker/32/105_2.png) [@scstriker](https://forums.jcsda.org/u/scstriker)\
**Post date:** [November 21, 2021, 3:39pm UTC](https://forums.jcsda.org/t/is-there-coefficients-for-fy-3c-fy-3d-radiometer-mwri/227/1 "2021-11-21T15:39:12Z")

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Is there coefficients for FY-3C &FY-3D radiometer MWRI?  
Very thanks!

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**Author:** ![scstriker](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.jcsda.org/scstriker/32/105_2.png) [@scstriker](https://forums.jcsda.org/u/scstriker)\
**Post date:** [November 21, 2021, 4:00pm UTC](https://forums.jcsda.org/t/is-there-coefficients-for-fy-3c-fy-3d-radiometer-mwri/227/2 "2021-11-21T16:00:50Z")

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as a beginner here ,I wonder is there any difference of coefficients  
between the same instrument onboard different satellites? e.g. MWRI on the FY-3C &FY-3B?

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**Author:** ![StegmannJCSDA](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.jcsda.org/stegmannjcsda/32/53_2.png) [@StegmannJCSDA](https://forums.jcsda.org/u/StegmannJCSDA)\
**Post date:** [November 22, 2021, 9:11pm UTC](https://forums.jcsda.org/t/is-there-coefficients-for-fy-3c-fy-3d-radiometer-mwri/227/3 "2021-11-22T21:11:35Z")

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> [@scstriker](#):
>
> Is there coefficients for FY-3C &FY-3D radiometer MWRI?

Yes, there are.

Once you clone the crtm repository and download the coefficients you can check for available instruments in the `$CRTM_ROOT/fix/TauCoeff/` and `SpcCoeff/` folders. Instrument coefficients come in SpcCoeff and TauCoeff pairs.

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**Author:** ![StegmannJCSDA](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.jcsda.org/stegmannjcsda/32/53_2.png) [@StegmannJCSDA](https://forums.jcsda.org/u/StegmannJCSDA)\
**Post date:** [November 22, 2021, 9:15pm UTC](https://forums.jcsda.org/t/is-there-coefficients-for-fy-3c-fy-3d-radiometer-mwri/227/4 "2021-11-22T21:15:08Z")

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> [@scstriker](#):
>
> as a beginner here ,I wonder is there any difference of coefficients  
> between the same instrument onboard different satellites? e.g. MWRI on the FY-3C &FY-3B?

Yes.

There may be slight differences between instruments on different satellites because of manufacturing variances, different launch conditions etc. .  
For the CRTM this manifests itself in different spectral response functions and antenna corrections between instruments.

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**Author:** ![scstriker](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.jcsda.org/scstriker/32/105_2.png) [@scstriker](https://forums.jcsda.org/u/scstriker)\
**Post date:** [November 23, 2021, 1:53am UTC](https://forums.jcsda.org/t/is-there-coefficients-for-fy-3c-fy-3d-radiometer-mwri/227/5 "2021-11-23T01:53:17Z")

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thanks for your kindness!

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<div class="post-metadata">

**Author:** ![StegmannJCSDA](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.jcsda.org/stegmannjcsda/32/53_2.png) [@StegmannJCSDA](https://forums.jcsda.org/u/StegmannJCSDA)\
**Post date:** [November 29, 2021, 8:31pm UTC](https://forums.jcsda.org/t/is-there-coefficients-for-fy-3c-fy-3d-radiometer-mwri/227/6 "2021-11-29T20:31:06Z")

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No problem. Thank you for your interest.