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Viewing Parameters (INCIDENCE_ANGLE,...) for HRSC images ?
Nirgal
post Nov 6 2011, 02:53 PM
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Hi,

Does anyone know if/where the INCIDENCE_ANGLE & SUB_SOLAR_AZIMUTH parameters are available for a given MEX/HRSC observation ?

For HiRISE those parameters are usually published in the HiRISE Observation Toolbox or as part of the standard RDR product label file like this for example:

CODE
GROUP = VIEWING_PARAMETERS
    INCIDENCE_ANGLE   = 61.388593 <DEG>
    EMISSION_ANGLE    = 4.314944 <DEG>
    PHASE_ANGLE       = 57.393195 <DEG>
    LOCAL_TIME        = 15.59382 <LOCALDAY/24>
    SUB_SOLAR_AZIMUTH = 156.071516 <DEG>
END_GROUP = VIEWING_PARAMETERS


Maybe I overlooked something, but for MEX/HRSC I could not find those parameters among the parameters listed in one of the ( published standard HRSC/PDS products

Calculating those values oneself using ISIS3 (via the "campt" application) would be an option but then the raw intrument data would be needed which does not seem to be straightforwardly available for HRSC observations ...

Thanks for any help with this,
Bernhard



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mwolff
post Nov 9 2011, 02:47 PM
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Hi,

although you may have thought about this, but are interested in a tabular source or something similar. Nevertheless, I will mention it just in case. As long as you know image/pixel latitude, longitude, and UT time, you can obtain that which you seek by calculating the sub-solar latitude and longitude using NAIF (only requires basic solar system kernels, and possibly an SCLK kernel if want to use the MEX SCLK, MICA, or some other ephemerides software. With this info (and the target lat, lng), the incidence angle and azimuth can be computed from spherical trig.

If you are interested, but don't care for spherical trig, I will dig up my derivations (I never remember this stuff and usually have rederive it each time unless I write it down).

regards,

--mike



QUOTE (Nirgal @ Nov 6 2011, 09:53 AM) *
Hi,

Does anyone know if/where the INCIDENCE_ANGLE & SUB_SOLAR_AZIMUTH parameters are available for a given MEX/HRSC observation ?

[snip]
Calculating those values oneself using ISIS3 (via the "campt" application) would be an option but then the raw intrument data would be needed which does not seem to be straightforwardly available for HRSC observations ...

Thanks for any help with this,
Bernhard

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Nirgal
post Nov 9 2011, 07:33 PM
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Thanks for the suggestion !

QUOTE (mwolff @ Nov 9 2011, 03:47 PM) *
If you are interested, but don't care for spherical trig, I will dig up my derivations ...


Yes, this would be great ... Maybe I could then write a small script/program to automate the process to work with a lot of images (somehow extracting the necessary input parameters from the raw EDR files)

Thanks again for your help
- Bernhard

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