Art,
I’ll send you my whole script. I’m maybe not doing something you are with the
autoscaling or something. I am pretty sure I compared my calculated IR/WV
results from the GRB data at least with the CSMI data coming over NOAAPORT and
they are the same.
I’m at my daughters gymnastics invite all day so may not be til tonight.
Pete
Sent from my iPhone
On Jan 13, 2018, at 9:04 AM, Arthur A Person
<aap1@xxxxxxx<mailto:aap1@xxxxxxx>> wrote:
Pete,
Thanks for the help. Actually, I already tried adding parens to the equation,
including the variation you
suggested, but the results are the same. Do you have a few lines of code that
worked for you that you'd
be willing to share? Or, do you recall whether there's any issue with netCDF
auto-scaling the input data,
or any units conversion that has to be included that's not in the documentation?
Thanks... Art
________________________________
From: "Pete Pokrandt" <poker@xxxxxxxxxxxx<mailto:poker@xxxxxxxxxxxx>>
To: "ARTHUR AUGUST PERSON" <aap1@xxxxxxx<mailto:aap1@xxxxxxx>>, "ldm-users"
<ldm-users@xxxxxxxxxxxxxxxx<mailto:ldm-users@xxxxxxxxxxxxxxxx>>
Sent: Friday, January 12, 2018 11:47:08 AM
Subject: Re: [ldm-users] Problem calculating GOES-16 brightness temperature
from radiance
Art,
I think it may be a parenthesis/order of operations issue. I seem to recall
having this same issue when I first started working with the GRB data.
Try this:
bt = ( planck_fk2 / ( np.log((planck_fk1 / rad) + 1 )) - planck_bc1) /
planck_bc2
Pete
________________________________
From:
ldm-users-bounces@xxxxxxxxxxxxxxxx<mailto:ldm-users-bounces@xxxxxxxxxxxxxxxx>
<ldm-users-bounces@xxxxxxxxxxxxxxxx<mailto:ldm-users-bounces@xxxxxxxxxxxxxxxx>>
on behalf of Arthur A Person <aap1@xxxxxxx<mailto:aap1@xxxxxxx>>
Sent: Friday, January 12, 2018 7:43 AM
To: ldm-users@xxxxxxxxxxxxxxxx<mailto:ldm-users@xxxxxxxxxxxxxxxx>
Subject: [ldm-users] Problem calculating GOES-16 brightness temperature from
radiance
Hi...
I'm trying to calculate brightness temperature from radiance for GOES-16 IR
channel 7 using rebroadcast data
but my values compared to McIDAS imagery are coming out 15 to 20 degrees C too
warm. I'm using the following
values and code:
Test imagery:
OR_ABI-L1b-RadC-M3C07_G16_s20180112232223_e20180112235008_c20180112235045.nc
rad (radiance) is read in from and auto-scaled by netCDF,
planck_fk1: 202263.0
planck_fk2: 3698.18994140625
planck_bc1: 0.4336099922657013
planck_bc2: 0.9993900060653687
bt = ( planck_fk2 / np.log( (planck_fk1/rad)+1 ) - planck_bc1 ) / planck_bc2
bt = bt - 273.15
Can anyone tell me if I'm missing a step or spot a dumb mistake?
Thanks... Art
--
Arthur A. Person
Assistant Research Professor, System Administrator
Penn State Department of Meteorology and Atmospheric Science
email: aap1@xxxxxxx<mailto:aap1@xxxxxxx>, phone: 814-863-1563
--
Arthur A. Person
Assistant Research Professor, System Administrator
Penn State Department of Meteorology and Atmospheric Science
email: aap1@xxxxxxx<mailto:aap1@xxxxxxx>, phone: 814-863-1563
