Output from CRTM_RTSolution_Inspect

CRTM
1

I’m using the check_crtm.f90 and its 4 test profiles that came with v2.4.0 to learn how to run the CRTM. I need only the forward model, so I’ve removed the K-matrix material. The program runs, but the output from CRTM_RTSolution_Inspect has the (default) values of zero for “Up Radiance”, “Down Radiance”, “Down Solar Radiance”, and “Surface Planck Radiance”. What do I need to do to output the actual values for those components? Apart from removing the lines involving the K-matrix calculations, I did also switch out the original sensors to the ones I’m interested in: abi_gr, viirs-m_npp, v.modis_terra, and v.modis_aqua. In addition, I modifed the geometry arguments. I have: Sensor_Zenith_Angle=0.0, Sensor_Scan_Angle=0.0, Source_Zenith_Angle=30.0, Source_Azimuth_Angle=90.0, Longitude=90.0, and Latitude=45.0.

Thanks,
Jack

1 Like
2

Hello Jack @JackD, welcome to the forum.
If you are interested in running the forward model at first, I suggest having a look at the CRTM tutorial instead:

check_crtm.f90 is part of the legacy build system and maintaining it is not a priority anymore.

3

Thanks for the welcome and the information. Would you please clarify of your statement about “having a look at the CRTM instead”? The program check_crtm.f90 does run the CRTM, both the forward model (my current interest) and k-matrix computations. The code to which you pointed appears to be k-matrix material only (I must say however that I may eventually be interested in weighting function generation). In fact, the program KMatrix_test.f90 looks a lot like check_crtm.f90, only focusing on just k-matrix calculations.

4

*having a look at the CRTM tutorial instead. Sorry about the typo.

The Nakajima-King diagram tutorial case for example only calls the forward operator.

5

Aha. And apologies on my part as well. I looked at the two k-matrix examples, but not the Nakajima-King case, which has the forward model example I am interested in.

Thanks,
Jack

6

Good afternoon,

I’m revisiting this topic (2.5 years later). When I call CRTM_RTSolution_Inspect after a call to CRTM_Forward I see zeros for some of the intermediate results I’m interested in. The following fields give me zeros where I don’t think there should be: Surface Emissivity, Surface Reflectivity, Up Radiance, Down Radiance, Down Solar Radiance, Surface Planck Radiance, Upwelling Overcast Radiance, Upwelling Radiance. Any thoughts would be appreciated. I’m using CRTM v2.4.0

Thanks,

Jack

7

Sorry for the delay. When clouds are present, that version of CRTM didn’t output certain values. It’s been corrected in v3 (if I recall correctly).

Some of these values are always zero, depending on which sensor / frequency you’re using.

8

Thanks. I’ll look into moving to 3.0.

9

Feel free to set up a Google meet with me anytime you want and I can help walk you through updating, it’s pretty easy but there’s just a couple of things that could get you tripped up.

10

Are you available now or in a few minutes? I just cloned CRTMv3 and started the setup.

11

It’s 5:00 PM here so I’m not available until Tuesday I have an all day meeting on Monday.

12

Ah, you’re on the East Coast–I thought you were in Boulder. Tuesday is fine. My schedule is pretty open. Is there a time that works better for you?

13

II set a meeting for 11 o’clock your time on Tuesday, hope that works, happy to shift it around if you need to.

14

Tuesday at 11:00 am MT is fine. Thanks.