The Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) is a Visible and Near-Infrared (VNIR) imaging spectrometer onboard Mars Reconnaissance Orbiter (MRO), in orbit since 2006. It was built and tested by the Johns Hopkins University Applied Physics Laboratory under the supervision of principal investigator Scott Murchie. The observations enable to have mineralogy information of the martian surface at a spatial resolution of ~20 to ~200 m/px.
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== Data description ==
The CRISM instrument has two acquisition modes:
=== The targeted mode (multiangular pointing) ===
The instrument tracks the targets and takes 11 hyperspectral images (544 bands from 362 to 3920 nm) at different emission angles due to the rotation of the detector at ± 70°: 10 hyperspectral images taken at different emission angles before and after the central image corresponding to the close nadir image (image #07). The 10 hyperspectral multi-angular observations are reduced to a factor 10 compared to the spatial resolution of the central image. According to the spatial resolution of the central image, four product types are associated to this acquisition mode. If the central image is sampled at 20 m/px, the associated product is a ''Full Resolution Targeted'' observation (FRT). By reducing the spatial resolution of the central image by a factor 2, the spatial resolution is set at 40 m/px and the associated products are ''Half Resolution Short'' (HRS) and ''Half Resolution Long'' (HRL) observations. An HRL sampled surface is twice as long as an HRS observation. Only the central image #07 is processed by MarsSI for the mineralogy identification. ATO observations are ''Along-Track Oversampled'' products resulting in incresing of the resolution up to 3 m/px.
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amp; amp; amp; amp; amp; amp; amp; amp; amp; quot; & amp; amp; amp; amp; amp; amp; amp; amp; amp; quot; & amp; amp; amp; amp; amp; amp; amp; amp; quot; & amp; amp; amp; amp; amp; amp; amp; quot; & amp; amp; amp; amp; amp; amp; quot; & amp; amp; amp; amp; amp; quot; & amp; amp; amp; amp; quot; & amp; amp; amp; quot; & amp; amp; quot; & amp; quot; & quot; "">'''ATO''': 3-12 m/px ||
|| {{attachment:FRT.png||width="200"}} || {{attachment:HRS.png||width="200"}} || {{attachment:HRL.png||width="200"}} || {{attachment:ATO.png||width="200"}} ||
=== The survey mode (nadir pointing) ===
This mode was designed to estimate key locations for further analysis with the targeted mode as it covers wider areas and produces lower spatial resolution data than the ''targeted ''mode. The instrument acquires multispectral images using fixed pointing where the emission angle is set at 0° (with specific bands chosen over the 544 spectral bands, in order to identify principal minerals). There are different types of observations using this acquisition mode:
* ''Multispectral Survey'' (MSP): 200 m/px and 55 channels
* Hyperspectral Survey (HSP): 200 m/px and 154 channels
* ''Multispectral Window'' (MSW): 100 m/px
== Processing CRISM data ==
* From the “Maps” tab, zoom-in on your region of interest, you can display the THEMIS mosaic for more precision, and then display the CRISM layer corresponding either to the '' targeted ''or ''survey ''mode, or You get all CRISM stamps that appear in red or pink. You can use the “Select” button to choose the stamp you desire. You can choose several stamps by clicking on several stamps, or by dragging your mouse to select adjacent stamps. You can also use the “Search” button for more options.
* To add your desired stamps to your cart click on “Add” in the “Cart” window: you can notice in the “Cart” window that different data were added: the TRDR files and the DDR files in Short (VNIR) and Long (IR) wavelength ranges, “S” and “L”. Only the “L” cubes are used in the CRISM processing and are needed for further processing in MarsSI, but you can also download the “S” cubes for your own use. Then, go to the “Workspace” tab.
* Your CRISM TRDR and DDR “L” files appear in the window “Data to process”. If not, you may already have processed them yourself, or someone else may have processed them, then they may already be in the “Data processed” window. If the data have not been processed, you will have to go download and process the TRDR and DDR cubes by clicking on the “Process” button in the “Data to process” button.
=== Pipeline ===
'''1)''' The TRDR cube containing the reflectance values in the infrared range will be processed using an implementation of the CAT pipeline (CRISM Analysis Tools, an add-on to IDL/ENVI available from the CRISM team (Murchie et al., 2007; Pelkey et al., 2007)). The cube will be '''corrected for the observation geometry''' (reflectance divided by the cosine of the incidence angle, available in the associated DDR cube) and for '''absorptions due to atmospheric CO2''' using the CAT algorithm developed for CRISM based on the ‘volcano-scan’ approach (McGuire et al., 2009).
{{attachment:corr.png||width="300"}}
FRT00003E12_07_IF166L_TRR3_CAT_corr.img
'''2)''' The targeted TRDR cube corrected for atmospheric absorption and incidence angle will then be processed through a custom pipeline to '''remove column-dependant noise''' and '''enhance spectral features of small spatial extent''': this pipeline basically divides the whole spectral data in the cube by a '''median spectrum''' computed from half of the lines (those in the middle) of the cube, on a column-by-column basis: a procedure we dub ‘ratioing’. The output ratioed cube is dubbed `medianratio`. A by-product of the procedure is the creation of a transposed cube where columns and lines are switched, but which is only saved for the pipeline processing and should not be used as a standalone product. This procedure dramatically reduces detector noise (mostly column-dependant), corrects for most residual atmospheric absorptions (CO2 gas and/or water vapor/ice)and enhances small spectral features in ratioed spectra. However, there are also caveats to this ratioing procedure, such as the risk to introduce artifacts in ratioed spectra if the median spectra used for division itself was not blank but had spectral features: in such cases, the ratioed spectra will show inverted spectral features (eg., an absorption in median spectra will yield a positive peak in ratioed spectra) which will be artifacts and must not be interpreted as meaningful data. Still, for typical CRISM data, acquired over terrain with spectral features of low spatial extent (a few times smaller than the cube spatial extent), the median spectra will be nearly featureless and allow for reasonably straightforward detection of meaningful spectral features in ratioed spectra.
{{attachment:median.png||width="300"}}
FRT00003E12_07_IF166L_TRR3_CAT_corr_medianratio.img
'''3)''' The penultimate step of the pipeline '''computes so-called ‘spectral parameters’ or ‘spectral criteria’ '''such as band depths or combination of band depths, as initially implemented in the CAT for multispectral CRISM data (Pelkey et al., 2007), or other parameters based on analysis of the shape of the spectra. We take advantage of the higher number of spectral channels in hyperspectral targeted CRISM observations compared to original CAT multispectral parameters: signal-to-noise is improved by using medians of spectral channels and specificity of criteria is improved by combining two or more criteria. The definition of a subset of the custom criteria available in MarsSI is given in Thollot et al. (2012) and the remaining can be made available on request (pending publication in a future paper). The resulting data cube, dubbed `hyparam` (for hyperspectral parameters), has the same spatial dimensions as the TRDR but each band in the spectral dimension contains the result of the computing of a spectral criterion designed for detection of one or several spectral features from the `medianratio` cube resulting from the previous step. The `hyparam` cube can be used in parallel with spectral data in IDL/ENVI to compare the spatial mapping of spectral criterion with actual spectra.
{{attachment:hyp.png||width="300"}}
FRT00003E12_07_IF166L_TRR3_CAT_corr_medianratio_hyparam.img
'''4)''' Finally, the pipeline '''projects '''the `hyparam` cube (adding the `_p `suffix) for use in a GIS in combination with other datasets (DTMs, CTX or HiRISE, etc.).
{{attachment:p.png||width="300"}}
FRT00003E12_07_IF166L_TRR3_CAT_corr_medianratio_hyparam_p_equir.img
'''References on CRISM processing''':
* McGuire P. C., e t al. (2009), An improvement to the volcano - scan algorithm for atmospheric correction of CRISM and OMEGA spectral data, Planet. Space Sci., 57(7), 809 - 815.
* Murchie, S., et al. (2007), Compact reconnaissance Imaging Spectrometer for Mars (CRISM) on Mars Rec onnaissance Orbiter (MRO), J. Geophys. Res., 112(E5).
== Data names ==
The CRISM naming convention is the following:
{{{
(ClassType)(ObsID)_(Counter)_(Activity)(SensorID)_(Filetype).(EXT)
}}}
* `ClassType`: FRT, HRS, HRL, ATO, MSP, HSP, MSW, ...
* `ObsID`: observation ID
* `Counter`: image number of the ''targeted ''sequence (only the n°7 is used in MarsSI). In the ''survey ''mode, this corresponds to 1
* `Activity`: subtype of product: IF stands for reflectance data (I/F unit), DE for ancillary data (''e.g.'' latitude, longitude, incidence, emission, phase angle
* `SensorID`: S detector (Short wavelenghts) or L (Long wavelenghts)
* `Filetype`: type of dataset: TRR3 are calibrated data cubes, DDR1 companion data cube containing the ancillary data
Ex: `FRT000A82E_07_IF164L_TRR3.IMG` correponds to calibrated data cube containing the reflectance data (I/F unit) in the IR range (from 1002 to 3920 nm) of the central image (corresponding to the “07” image of the ''targeted ''sequence) of an FRT observation.
