Vis Flag Map Product¶
$SetSchemaPath vis/euc-vis-FlagMap.xsd
Data product name¶
$PrintDataProductName
Data product custodian¶
$PrintDataProductCustodian
Name of the Schema file¶
$PrintSchemaFilename
Last Edited for DPDD Version¶
1.1
Data product elements¶
$PrintDataProductElements
Processing Element(s) creating/using the data product¶
Flag Map
Processing function using the data product¶
VIS
Proposed for inclusion in EAS/SAS¶
Yes
Detailed description of the data product¶
Flag map is useful for selecting suitable objects in the image and removing invalid pixels.
The Flagmap data format is defined in the data model.
Table¶
Bit |
Bit Mask |
Flag Value |
Flag Name |
0 |
0x00000001 |
1 |
INVALID |
1 |
0x00000002 |
2 |
HOT |
2 |
0x00000004 |
4 |
COLD |
3 |
0x00000008 |
8 |
SAT |
4 |
0x00000010 |
16 |
COSMIC |
5 |
0x00000020 |
32 |
GHOST |
6 |
0x00000040 |
64 |
QUADEDGE |
7 |
0x00000080 |
128 |
BAD_COLUMN |
8 |
0x00000100 |
256 |
BAD_CLUSTER |
9 |
0x00000200 |
512 |
CR_REGION |
12 |
0x00001000 |
4,096 |
OVRCOL |
13 |
0x00002000 |
8,192 |
EXTOBJ |
14 |
0x00004000 |
16,384 |
SCATLIGHT |
15 |
0x00008000 |
32,768 |
CHARINJ |
17 |
0x00020000 |
131,072 |
SATXTALKGHOST |
18 |
0x00040000 |
262,144 |
STARSIGNAL |
19 |
0x00080000 |
524,288 |
SATURATEDSTAR |
20 |
0x00100000 |
1,048,576 |
CTICORRECTION |
21 |
0x00200000 |
2,097,152 |
ADCMAX |
22 |
0x00400000 |
4,194,304 |
NO_DATA |
23 |
0x00800000 |
8,388,608 |
STITCHBLOCK |
24 |
0x01000000 |
16,777,216 |
OBJECTS |
Flags description :¶
- Bit 0 - INVALID
Convenience flag, combination of several vis flags identifying pixels with an arbitrary value which shall not be used for anything.
- Bit 1 - HOT
Hot pixel: defective always bright pixel.
- Bit 2 - COLD
Cold pixel: defective unresponsive pixel.
- Bit 3 - SAT
Saturated pixel: pixel near or above blooming threshold.
- Bit 4 - COSMIC
Cosmic ray: pixel affected by a cosmic ray.
- Bit 5 - GHOST
Optical ghost: pixel affected by an optical ghost.
- Bit 6 - QUADEDGE
Quadrant edge: pixel near a quadrant edge, which causes pixel-size and nonlinear response variations.
- Bit 7 - BAD_COLUMN
Part of a column of bad pixels which have an abnormal behaviour, e.g. hot, cold, low noise, high noise.
- Bit 8 - BAD_CLUSTER
Secondary bad pixel which is part of a cluster of immediate neighbours of hot or cold pixels.
- Bit 9 - CR_REGION
Pixel belonging to a region in which detected cosmic rays per pixel ratio is too high for correct processing.
- Bit 12 - OVRCOL
Overflow column: pixel affected by a neighbouring saturated pixel.
- Bit 13 - EXTOBJ
Extended object: pixel part of an extended astronomical object.
- Bit 14 - SCATLIGHT
Scattered light: pixel affected by non diffuse scattered light.
- Bit 15 - CHARINJ
Charge injection: pixel part of charge injection line, not exposed.
- Bit 17 - SATXTALKGHOST
Saturated crosstalk ghost: pixel affected by electronic crosstalk caused by a saturated pixel.
- Bit 18 - STARSIGNAL
Star signal: pixel affected by a star psf.
- Bit 19 - SATURATEDSTAR
Saturated star: pixel affected by a saturated star psf.
- Bit 20 - CTICORRECTION
Charge transfer inefficiency correction: pixel affected by cti correction by more than 1 (tbd) adu.
- Bit 21 - ADCMAX
Analog-to-digital-converter maximum: pixel at maximum adc value (65,535) before vis processing.
- Bit 22 - NO_DATA
No data available for this pixel (being 0 adu in vis input raw frame), due to transmission error, truncated/incomplete raw file, failing quadrant, ccd or roe, or anything else.
- Bit 23 - STITCHBLOCK
Photolithographic stitch-block boundary: pixel may have a non-nominal size.
- Bit 24 - OBJECTS
Detected objects in science image, currently non-zero pixels in objects sextractor check-image.