Next: Sky Surveys . Up: Virtual Observatory and Archives . ... The NOAO Science Archive (NSA) is a major step toward building a comprehensive scientific archive of the optical and infrared data holdings of the National Optical Astronomy Observatory. ... Planning for the NSA was started in November of 2001 by the Science Data Systems Group of the NOAO Data Products Program.Version 1.0 of the NSA was released in April, version 1.1 in July and version 1.2 in October of 2002. ...