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

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