# Spectral Response Functions for Operational Instruments

**URL:** <https://forums.jcsda.org/t/spectral-response-functions-for-operational-instruments/657>\
**Category:** CRTM\
**Created:** [February 11, 2025, 11:09pm UTC](https://forums.jcsda.org/t/spectral-response-functions-for-operational-instruments/657 "2025-02-11T23:09:53Z")\
**Posts on this page:** 7\
**Page:** 1

<div class="post-metadata">

**Author:** ![JackD](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.jcsda.org/jackd/32/218_2.png) [@JackD](https://forums.jcsda.org/u/JackD)\
**Post date:** [February 11, 2025, 11:09pm UTC](https://forums.jcsda.org/t/spectral-response-functions-for-operational-instruments/657/1 "2025-02-11T23:09:53Z")

</div>

Hi,  
I’m wondering what the official source is for the spectral response functions that the CRTM uses. I’m particularly interested in the ABI and the VIIRS instrument at the moment, but in general, where are the SRFs acquired?

Thanks,  
Jack

---

<div class="post-metadata">

**Author:** ![BenjaminTJohnson](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.jcsda.org/benjamintjohnson/32/19_2.png) [@BenjaminTJohnson](https://forums.jcsda.org/u/BenjaminTJohnson)\
**Post date:** [February 11, 2025, 11:21pm UTC](https://forums.jcsda.org/t/spectral-response-functions-for-operational-instruments/657/2 "2025-02-11T23:21:23Z")

</div>

It’s typically ad hoc, although many of them come from the NOAA STAR SRF repository.

[https://www.star.nesdis.noaa.gov/icvs/jpss\_srf.php](https://www.star.nesdis.noaa.gov/icvs/jpss_srf.php)

---

<div class="post-metadata">

**Author:** ![JackD](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.jcsda.org/jackd/32/218_2.png) [@JackD](https://forums.jcsda.org/u/JackD)\
**Post date:** [February 12, 2025, 3:21pm UTC](https://forums.jcsda.org/t/spectral-response-functions-for-operational-instruments/657/3 "2025-02-12T15:21:31Z")

</div>

Thanks. One follow-up question: Is there a way to pull out from the CRTM files the information needed to plot the SRFs?

---

<div class="post-metadata">

**Author:** ![BenjaminTJohnson](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.jcsda.org/benjamintjohnson/32/19_2.png) [@BenjaminTJohnson](https://forums.jcsda.org/u/BenjaminTJohnson)\
**Post date:** [February 20, 2025, 3:03am UTC](https://forums.jcsda.org/t/spectral-response-functions-for-operational-instruments/657/4 "2025-02-20T03:03:21Z")

</div>

there’s OSRF data available for certain instruments, I could provide that to you directly. It’s a standardized SRF format used by CRTM. Let me know which specific instruments you need.

---

<div class="post-metadata">

**Author:** ![JackD](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.jcsda.org/jackd/32/218_2.png) [@JackD](https://forums.jcsda.org/u/JackD)\
**Post date:** [February 25, 2025, 3:54pm UTC](https://forums.jcsda.org/t/spectral-response-functions-for-operational-instruments/657/5 "2025-02-25T15:54:23Z")

</div>

If you could send to me the SRF for the ABI (GOES-16,-18,-19) and VIIRS instruments (SNPP, NOAA-20,NOAA-21) that would be great. Thanks! Jack

---

<div class="post-metadata">

**Author:** ![BenjaminTJohnson](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.jcsda.org/benjamintjohnson/32/19_2.png) [@BenjaminTJohnson](https://forums.jcsda.org/u/BenjaminTJohnson)\
**Post date:** [February 27, 2025, 3:22am UTC](https://forums.jcsda.org/t/spectral-response-functions-for-operational-instruments/657/6 "2025-02-27T03:22:31Z")

</div>

Which email address do you prefer?

---

<div class="post-metadata">

**Author:** ![JackD](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.jcsda.org/jackd/32/218_2.png) [@JackD](https://forums.jcsda.org/u/JackD)\
**Post date:** [February 27, 2025, 4:10pm UTC](https://forums.jcsda.org/t/spectral-response-functions-for-operational-instruments/657/7 "2025-02-27T16:10:31Z")

</div>

jack.dostalek@colostate.edu --Thanks