ObjID

来自Shiyin's note
Shen讨论 | 贡献2014年12月21日 (日) 09:40的版本
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DR7之前和DR8之后的定义方式似乎不太一样

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: [2]
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