"The South Korean and US intelligence officials know about the missile base in much more detail".
The New York Times (NYT) first reported the CSIS imagery with the headline "In North Korea, Missile Bases Suggest a Great Deception".
The base, about 85 kilometers north of the demilitarized zone, is reportedly equipped with short-range ballistic missiles.
It said the bases are "combined with decades of extensive camouflage, concealment and deception practices to maximize the survival of its missile units from pre-emptive strikes and during wartime operations".
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The authors say the sites, which can be used for all classes of ballistic missiles, should be declared by North Korea and inspected in any credible, verifiable deal that addresses Pyongyang's most significant threats to the United States and its allies.
South Korean presidential spokesman Kim Eui-kyeom said Seoul is aware of the facilities and that they underscore the need for faster, more serious negotiations between Washington and Pyongyang.
Bases in the furthest, or "strategic", belt are more than 150km (93 miles) from the DMZ, and are likely to be equipped with the Hwasong class of missiles, which can reach the USA mainland, according to the report. "It has never signed any agreement, any negotiation that makes shutting down missile bases mandatory... the fact that such a missile base exists shows the necessity for negotiations to be achieved quickly".
But on Thursday, US ambassador to the United Nations Nikki Haley said North Korea postponed the meeting "because they weren't ready". The nuclear and missile tests that brought East Asia close to war in 2017 would resume if the US more vigorously enforced sanctions on North Korea.
The report said: "Missile operating bases are not launch facilities".
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Mr Cha had been in line for appointment as U.S. ambassador to South Korea, but was dropped because of disagreement with the Trump administration's approach.
Secretary of State Mike Pompeo was scheduled to meet with Kim Yong Chol, vice chairman of the North Korean Central Committee, in New York City last week.
The revelation of these sites is significant because the US has been working on Pyongyang to curb its nuclear and ballistic missile programme.
"I assume the meeting was delayed because both sides realized that significant progress is not possible at this time, due to the major differences between the US and [North Korea] on denuclearization", said Samore.
"Far from "moving ahead with its ballistic missile program, ' Bermudez notes that 'only minor infrastructure changes were observed" at this particular site since Kim Jong Un came to power in December 2011", Sigal added.
"While missiles could be launched from within them in an emergency, Korean People's Army operational procedures call for missile launchers to disperse from the bases to pre-surveyed or semi-prepared launch sites for operations".
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Many observers, including the Central Intelligence Agency, believe that Kim has no intention of ever giving up his nuclear weapons.