Data quality (DQ) flags

The data quality flags describe the quality of a given pixel. A static DQ Model is used to initialize the DQ attribute in each data model. Values in the DQ array can be any valid unsigned integer where each bit represents whether that DQ flag is true (1) or false (0). If all bits are zero, the pixel is considered good.

Classes:

• DQModel

Calibration type: dq

Extensions

HDU Name	HDU Type	Data Type	Dimensions	Units	Description
DQ	Image	UInt32	Ny x Nx	None	Data quality.

DQ flags

Bit	Value	Name	Description
	0	GOOD	Good pixel.
0	1	DO_NOT_USE	Bad pixel. Do not use
1	2	SATURATED	Pixel saturated during exposure
2	4	JUMP_DET	Jump detected during exposure
3	8	OUTLIER_MID_TIME	Mid exposure time is outlier in spectral order
4	16	OUTLIER	Flagged by outlier detection
5	32	PERSISTENCE	Pixel exhibiting high persistence
6	64	TBD
7	128	TBD
8	256	UNRELIABLE_ERROR	Uncertainty exceeds quoted error
9	512	NON_SCIENCE	Pixel not on science portion of detector
10	1024	DEAD	Dead pixel
11	2048	HOT	Hot pixel
12	4096	WARM	Warm pixel
13	8192	LOW_QE	Low quantum efficiency
14	16384	TBD
15	32768	TELEGRAPH	Telegraph pixel
16	65536	NONLINEAR	Pixel highly nonlinear
17	131072	BAD_REF_PIXEL	Reference pixel cannot be used
18	262144	CROSS_BAD	Center of cross-shaped bad pixel
19	524288	CROSS_BAD_NEIGH	Neighbor of cross-shaped bad pixel
20	1048576	TBD
21	2097152	TBD
22	4194304	UNRELIABLE_BIAS	Bias variance large
23	8388608	UNRELIABLE_DARK	Dark variance large
24	16777216	UNRELIABLE_SLOPE	Slope variance large
25	33554432	UNRELIABLE_FLAT	Flat variance large
26	67108864	UNRELIABLE_WS	Unreliable wavelength solution
27	134217728	LOW_INST_TRANS	Low instrument transmission (blaze < ~90%)
28	268435456	TELLURIC	Telluric absorption line
29	536870912	OH_LINE	OH emission line
30	1073741824	OTHER_BAD_PIXEL	A catch-all flag
31	2147483648	REFERENCE_PIXEL	Pixel is a reference pixel