SDSS 5-Year Baseline Survey
Revised Baseline Performance Metrics for Imaging - Northern Survey Region
Revised 20-Jan-2005
Period		Available dark hrs.		Imaging fraction	Weather	System uptime	Imaging efficiency	Imaging ops.	End game	Available imaging hours	Imaging (sq. deg.)
2000	Q1	-		-	-	-	-	-	-	0	0
	Q2	277		0.23	0.6	0.9	0.86	0.9	1	26.6	413
	Q3	40		0.23	0.5	0.9	0.86	0.9	1	3.2	50
	Q4	196		0.23	0.6	0.9	0.86	0.9	1	18.8	292
2001	Q1	464		0.23	0.6	0.9	0.86	0.9	1	44.6	691
	Q2	277		0.23	0.6	0.9	0.86	0.9	1	26.6	413
	Q3	40		0.23	0.5	0.9	0.86	0.9	1	3.2	50
	Q4	196		0.23	0.6	0.9	0.86	0.9	1	18.8	292
2002	Q1	464		0.23	0.6	0.9	0.86	0.9	1	44.6	691
	Q2	277		0.23	0.6	0.9	0.86	0.9	1	26.6	413
	Q3	40		0.23	0.5	0.9	0.86	0.9	1	3.2	50
	Q4	196		0.23	0.6	0.9	0.86	0.9	1	18.8	292
2003	Q1	464		0.23	0.6	0.9	0.86	0.9	1	44.6	691
	Q2	277		0.23	0.6	0.9	0.86	0.9	1	26.6	413
	Q3	40		0.23	0.5	0.9	0.86	0.9	1	3.2	50
	Q4	196		0.23	0.6	0.9	0.86	0.9	1	18.8	292
2004	Q1	464		0.23	0.6	0.9	0.86	0.9	1	44.6	691
	Q2	277		0.23	0.6	0.9	0.86	0.9	1	26.6	413
	Q3	40		0.23	0.5	0.9	0.86	0.9	1	3.2	50
	Q4	196		0.23	0.6	0.9	0.86	0.9	1	18.8	292
2005	Q1	464		0.23	0.6	0.9	0.86	0.9	1	44.6	691
	Q2	277		0.23	0.6	0.9	0.86	0.9	1	26.6	413
TOTAL		5162								493.0	7642
Notes
1)  The 20-Jan-05 revision casts imaging progress in terms of "footprint" square degrees.  The original baseline was cast in terms of "unique" square degrees.