“ObjID”的版本间差异

2014年12月21日 (日) 09:36的版本

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

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

@@ 第1行： / 第1行： @@
 DR7之前和DR8之后的定义方式似乎不太一样
+*DR7 之前
-*
+:Bits 	Length (# of bits) 	Mask 	Assignment 	Description
-*DR8
+:0 	1 	0x8000000000000000 	empty 	unassigned
-The bits are assigned in objid as follows:
+: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:
 :63: 0, unassigned
 :59-62: skyVersion 	resolved sky version (for DR8 onlyuse 2; 0-15 available)