Hi Tejay,
I've spoken with the CRISM team about this issue, and they let me know that they updated the formulations of the BD1900_2 and BD1900R2 parameters in order to make the products less noisy. The preferred formulations these parameters for hyperspectral data are now:
BD1900_2: just BD1930 with slopes anchored at 1850 and 2067, with kernels of 5 for all wavelengths
BD1900R2: as listed in the SIS except with slopes anchored at 1815 and 2132, with kernels of 5 for the anchors and 1 for all other wavelengths
I'll be working with the CRISM team to make sure the documentation gets updated to reflect this.
As an additional note, many of the parameters have slightly different formulations for hyperspectral vs. multispectral data. In most cases, the main difference is kernel width (multispectral products always use a kernel width of 1, since there are fewer wavelengths available), but the following products all have other differences: RPEAK1, BDI1000VIS, BDI1000IR, VAR, BD1500_2, BD1900_2, BD1900R2, BDI2000, BD2100, BD2100_2, BD3400, BD3400_2. I'll be working with the CRISM team to make sure these differences are fully documented in the SIS.
Best,
John
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Hi Tejay,
For MIN2200 - yes, that currently uses a kernel width of 3 for R2210. That looks like a typo in the documentation (they have R2120 listed twice), so I'll pass it along to the team to get fixed.
For BD1900R2 - I'll check with the CRISM team on what kernel widths were used to generate the SU product. The calculations that I can see suggest a kernel width of 5 for the two anchor points and a kernel width of 1 for all the others, but it looks to me like the kernel width of 3 you suggest does a slightly better job of reproducing the data in the SU product.
John
Release 38 from the Mars Science Laboratory (Curiosity) mission includes new data for APXS, ChemCam, CheMin, DAN, and SAM from sols 4258-4354 (July 28, 2024 - November 5, 2024). The data are online at pds-geosciences.wustl.edu/missions/msl.
Hi John,
Once again thanks - I was just following up on this - I can also confirm that to replicate BD1900R2 with these slopes (which I will revert back to 1850/2060 once I've verified the rest) I needed to use:
A kernel width of 5 for the anchor points of R1815 and R2132.
A kernel width of 3 for all the others.
Do you know what the correct kernel widths should also be as the documentation says a kernel width of one (which I take to mean the closest frequency to):
I've got my 28 summary products I want now so this is as far as my verification goes :).
Thank you
Tejay