“ObjID”的版本间差异
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DR7之前和DR8之后的定义方式似乎不太一样 |
DR7之前和DR8之后的定义方式似乎不太一样,以至于SDSS III的skyserver上提供了一个DR7和DR8 match的表，里面分别有DR7和DR8的objID |
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[http://skyserver.sdss.org/dr10/en/help/browser/browser.aspx#&&history=description+PhotoObjDR7+U] |
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*DR7 之前[http://cas.sdss.org/dr7/en/help/docs/algorithm.asp?key=objID] |
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:Bits Length (# of bits) Mask Assignment Description |
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:0 1 0x8000000000000000 empty unassigned |
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:1-4 4 0x7800000000000000 skyVersion resolved sky version (0=TARGET, 1=BEST, 2-15=RUNS) |
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:5-15 11 0x07FF000000000000 rerun number of pipeline rerun |
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:16-31 16 0x0000FFFF00000000 run run number |
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:32-34 3 0x00000000E0000000 camcol camera column (1-6) |
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:35 1 0x0000000010000000 firstField is this the first field in segment? |
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:36-47 12 0x000000000FFF0000 field field number within run |
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:48-63 16 0x000000000000FFFF object object number within field |
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*DR8 The bits are assigned in objid as follows: [https://www.sdss3.org/dr8/glossary.php#ObjID] |
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:63: 0, unassigned |
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:59-62: skyVersion resolved sky version (for DR8 onlyuse 2; 0-15 available) |
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:48-58: rerun, number of pipeline rerun |
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:32-47: run, run number |
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:29-31: camcol, camera column (1-6) |
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:28: 0, unassigned |
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:16-27: field, field number within run |
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:0-15: id, object number within field |
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2014年12月21日 (日) 10:00的最新版本
DR7之前和DR8之后的定义方式似乎不太一样,以至于SDSS III的skyserver上提供了一个DR7和DR8 match的表，里面分别有DR7和DR8的objID [1]
- DR7 之前[2]
- Bits Length (# of bits) Mask Assignment Description
- 0 1 0x8000000000000000 empty unassigned
- 1-4 4 0x7800000000000000 skyVersion resolved sky version (0=TARGET, 1=BEST, 2-15=RUNS)
- 5-15 11 0x07FF000000000000 rerun number of pipeline rerun
- 16-31 16 0x0000FFFF00000000 run run number
- 32-34 3 0x00000000E0000000 camcol camera column (1-6)
- 35 1 0x0000000010000000 firstField is this the first field in segment?
- 36-47 12 0x000000000FFF0000 field field number within run
- 48-63 16 0x000000000000FFFF object object number within field
- DR8 The bits are assigned in objid as follows: [3]
- 63: 0, unassigned
- 59-62: skyVersion resolved sky version (for DR8 onlyuse 2; 0-15 available)
- 48-58: rerun, number of pipeline rerun
- 32-47: run, run number
- 29-31: camcol, camera column (1-6)
- 28: 0, unassigned
- 16-27: field, field number within run
- 0-15: id, object number within field