MRO CRISM Validation Report (VALREP)
Instrument: Compact Reconnaissance Imaging Spectrometer for Mars
PDS Data Set ID: MRO-M-CRISM-2-EDR-V1.0 (found inside each observation's directory)
For more information about CRISM products, go to the CRISM Product Primer.
For more information about Validation Reports, see the CRISM Data Product SIS.
For each observation, every EDR is compared against frame-by-frame predictions of commanded instrument state. The results of the comparison are written as a data validation report that accompanies the EDRs for that observation.
The text file provides a summary of automated data validation for the one or more EDRs created for a single observation. There is one report for VNIR data and one for IR data.
The first line in the report is the original downlink file (one per observation_id), and the observation type of collection of EDRs that the file is converted to.
Then there is a block of text for each EDR. The first line in the block is the EDR file name. The second line contains:
-
The command macro used to take it,
-
An ordinal counter of the EDR within the observation, and
-
The number of frames expected in the EDR.
Each time an anomalous condition is detected in any frame of the EDR, a one-line summary is added that states which frame and what condition. No anomalies are usually reported; there may be more than one anomaly per frame.
CRISM Observing Modes Used
Mode |
Pointing |
Description |
Coverage |
---|---|---|---|
Targeted (hyperspectral) |
Tracking as shown, once per target |
Full resolution (FRT) Spatial pixels unbinned for target – 18 m/pixel @ 300 km, 10x binned for EPF |
~6500 per Mars year |
Half resolution short (HRS) Spatial pixels 2x binned for target – 36 m/pixel @ 300 km, 10x binned for EPF; same swath length as above |
|||
Half resolution long (HRL) Spatial pixels 2x binned for target – 36 m/pixel @ 300 km, 10x binned for EPF; twice swath length as above |
|||
Full resolution short (FRS) Spatial pixels unbinned for target – 18 m/pixel @ 300 km; half swath length as above |
|||
Along-track oversampled (ATO) Spatial pixels unbinned for target – 18 m/pixel cross-track, up to ~3 m/pixel downtrack, requires special processing for increased resolution; half swath length as above |
|||
Along-track undersampled (ATU) Spatial pixels unbinned for target – 18 m/pixel cross-track, 36 m/pixel downtrack; half swath length as above |
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Atmospheric (hyperspectral) |
Tracking as shown but only center of target measured |
EPFs Spatial pixels 10x binned (~200 m/pixel @ 300 km) |
Lat./lon. grids every ~9° of Ls |
Nadir-pointed |
Tracking Optical Depth (TODs) Spatial pixels 10x binned (~200 m/pixel @ 300 km) |
Between other scheduled observations |
|
Limb scans |
Limb scan measurements (LMBs) Spatial pixels 10x binned; ~200 m vertical sampling |
2 orbits every 2 months |
|
Mapping (selected wavelengths) |
Nadir-pointed |
Multispectral survey (MSP or MSV) 73/74 or 94/94 selected channels, spatial pixels 10x binned (~200 m/pixel @ 300 km) |
~80% of Mars |
Multispectral windows (MSW) 73/74 or 94/95 selected channels, spatial pixels 5x binned (~100 m/pixel @ 300 km) |
Select areas plus sampling of seasonal variation at polar cap |
||
Hyperspectral survey (HSP or HSV) 262 channels, spatial pixels 10x binned (~200 m/pixel @ 300 km) |
Select areas plus sampling of seasonal variation at polar cap |
||
Radiometric Calibration (CAL) |
- |
Observations of onboard integrating sphere |
Daily |
Bias Calibration |
- |
Dark observations at multiple exposure times |
Daily |
Flat-Field Calibration (FFC) |
Nadir-pointed |
Observations of bland regions of Mars |
Every month |
Contents of each type of CRISM observation
Class of observation |
Frame rate, Hz |
Activity |
Pixel binning |
# |
Wave-lengths |
Frames (typical) |
---|---|---|---|---|---|---|
Full resolution targeted (FRT) |
3.75 |
central scan |
1 |
1 |
545 |
390 |
EPF scans |
10 |
10 |
15 |
|||
dark sets |
1 |
4 |
12 |
|||
Half resolution short targeted (HRS) |
3.75 |
central scan |
2 |
1 |
545 |
243 |
EPF scans |
10 |
10 |
15 |
|||
dark sets |
2 |
4 |
12 |
|||
Half resolution long targeted (HRL) |
3.75 |
central scan |
2 |
1 |
545 |
487 |
EPF scans |
10 |
10 |
15 |
|||
dark sets |
2 |
4 |
12 |
|||
Full resolution short (FRS) |
3.75 |
half central scan |
1 |
1 |
545 |
195 |
dark sets |
4 |
12 |
||||
Along-track oversampled (ATO) |
3.75 |
half central scan |
1 |
1 |
545 |
195 |
dark sets |
4 |
12 |
||||
Along-track undersampled (ATU) |
3.75 |
half central scan |
1 |
1 |
545 |
195 |
dark sets |
4 |
12 |
||||
Atmospheric survey (EPF) |
3.75 |
EPF scans |
10 |
11 or 13 |
545 |
15 |
dark sets |
4 |
12 |
||||
Limb scan (LMB) |
3.75 |
Individual scans |
10 |
variable |
545 |
540 |
dark sets |
same |
12 |
||||
Tracking optical depth (TOD) |
3.75 |
3-second segments |
10 |
12 |
545 |
12 |
dark sets |
4 |
|||||
Multispectral survey (MSP or MSV) |
15 |
3-minute segments |
10 |
8 |
73/74 or 94/95 |
2700 |
dark sets |
9 |
12 |
||||
Hyperspectral survey (HSP or HSV) |
15 |
3-minute segments |
10 |
8 |
262 |
2700 |
dark sets |
9 |
12 |
||||
Multispectral window (MSW) |
30 |
1 3-minute segment |
5 |
1 |
73/74 or 94/95 |
5400 |
dark sets |
2 |
12 |
||||
Radiometric calibration (CAL) |
1 (VNIR), 1 (IR) |
sphere background |
1 |
2 |
545 |
12 |
sphere frames |
1 |
32 |
||||
1 (VNIR), 3.75 (IR) |
sphere background |
2 |
12 |
|||
sphere frames |
1 |
32 |
||||
1 (VNIR), 15 (IR) |
sphere background |
10 |
2 |
73 |
12 |
|
sphere frames |
1 |
32 |
||||
1 (VNIR), 30 (IR) |
sphere background |
5 |
2 |
12 |
||
sphere frames |
1 |
32 |
||||
Bias calibration |
1 |
dark frames, several integration times |
1 |
4 |
438 (IR only) |
10 |
3.75 |
5 |
|||||
15 |
10 |
4 |
55 (IR only) |
|||
30 |
5 |
|||||
Flat field calibration (only 1 frame rate at a time) (FFC) |
1 |
dark sets |
1 |
2 |
545 |
12 |
3-minute segments |
1 |
180 |
||||
3.75 |
dark sets |
2 |
12 |
|||
3-minute segments |
1 |
675 |
||||
15 |
dark sets |
10 |
2 |
73 |
12 |
|
3-minute segments |
1 |
2700 |
||||
30 |
dark sets |
5 |
2 |
12 |
||
3-minute segments |
1 |
5400 |
CRISM VALREP products have the following file names:
nnnnnnnn_c_VALIDATION.TXT (with detached PDS label)
where:
nnnnnnnn = observation ID, unique for the whole CRISM mission, expressed as a hexadecimal number
c = sensor ID
S = VNIR
L = IR
In ODE, VALREP products have the following Product IDs:
NNNNNNNNNN_C_VALIDATION