查看“DESI”的源代码

http://desi.lbl.gov/
==图像巡天==
*  The Beijing-Arizona Sky Survey (BASS)	
* The DECam Legacy Survey (DECaLS)	
* The Mayall z-band Legacy Survey (MzLS)
* https://www.legacysurvey.org/
* 14000平方度，g,r,z及WISE的四个波段

==光谱巡天==
* * 5000根光纤
*  wavelength range 360 to 980 nm 
* spectral resolution of R = between 2000 and 5500
* 天区覆盖：14000 deg2，总样本 30 million spectroscopic target
* 四个子样本
:* (i) luminous red galaxies (LRGs) in the redshift range z = 0.3 to z = 1
:* (ii) emission line galaxies (ELGs) to z = 1.7
:* (iii) quasars to higher redshifts (2.1 < z < 3.5)
:* (iv) a magnitude-limited Bright Galaxy Survey out to z~0.6 with a median redshift of z~0.2 

===BGS===
* 在bright observing time进行
* a flux limited sample of around 10 million galaxies
*  r<19.5 (800 galaxies/deg^2) 
* 19.5 < r < 20  (a secondary sample, 600 galaxies/deg^2)