MSL data in the PDS and the Analyst's Notebook, Working with the archived science & engineering data |
MSL data in the PDS and the Analyst's Notebook, Working with the archived science & engineering data |
Feb 27 2013, 07:22 PM
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Solar System Cartographer Group: Members Posts: 10229 Joined: 5-April 05 From: Canada Member No.: 227 |
"February 27, 2013. MSL Release 1, part 1, Sols 0-89.
The first release of MSL data takes place in two parts. Part 1, February 27, 2013, includes raw data products (EDRs) acquired on Sols 0 through 89, August 6 through November 5, 2012, for these instruments: APXS, ChemCam, DAN, Hazcam, Navcam, and REMS, along with SPICE data. Part 2, March 20, 2013, will include the derived data products (RDRs) for Sols 0 though 89 for the APXS, ChemCam, DAN, Hazcam, Navcam, and REMS instruments, along with both the EDRs and RDRs for the CheMin and RAD instruments, and the RDRs for the SAM instrument. Release 1 does not include data from the MAHLI, MARDI, or Mastcam instruments. These instrument teams have not yet delivered data products to PDS. Some documents in the MSL archives are awaiting clearance by JPL Document Review and/or the JPL Import/Export Control Office. They will be posted online as soon as clearance has been received, and announced on this web site." Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PDF: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Mar 30 2013, 11:57 AM
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
Here the simplified theoretical principle for the two-colour pyrometer to calculate absolute temperature and the emissivities at two wavelengths from brightness temperatures, as far as I could infere it from Planck's law:
Input data: Take the (measured) brightness temperatures Tb_11 and Tb_18 at two frequencies nu_11 = c/11um and nu_18 = c/18um. Algorithm: Apply Planck's function to retrieve measured radiances I_11 := I(nu_11, Tb_11) and I_18 := I(nu_18, Tb_18). The graph of the according Planck functions is shown in the left of the two diagrams: Now start an iteration with initial emissivities E_11 = E_18 = 1: Calculate a modified radiance quotient by Q := (I_11 / E_11) / (I_18 / E_18). Calculate absolute temperature T_abs := T_abs(Q) for a given radiance quotient Q by applying the inverse function of the quotient I(nu_11,T)/I(nu_18,T) of the Planck functions (restricted to an appropriate temperature interval). The graph of I(nu_11,T)/I(nu_18,T) is shown in the right of the two diagrams above. Apply the Planck function to T_abs, to get the black body radiances I(nu_11, T_abs) and I(nu_18, T_abs) at T_abs for nu_11 and nu_18. Calculate E_11 := I_11/I(nu_11, T_abs) and E_18 := I_18/I(nu_18, T_abs) to get better approximatives for the emissivities. Repeat the iteration until T_abs changes less than a given epsilon; abort with an error, if it doesn't converge after an upper bound of iterations. If the iteration converges, we get absolute temperature, and emissivities at both wavelengths. |
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