【英文】兰德报告：绘制美国各地不明飞行现象的公开报告（62页）

The U.S. government is responsible for an estimated 5.3 million square miles of domestic  airspace and 24 million square miles of oceanic airspace. The February 2023 downing of a  Chinese surveillance balloon after it had flown across the country raised questions about the  degree to which the U.S. government knows who is flying what over its territorial skies. Like  all countries, the United States has finite resources to monitor objects flying through its airspace. At the same time, advances in technology allow the general public, private companies,  and civilian government agencies to operate ever-smaller commercially available drones that  intentionally or unintentionally capture and contribute to activity in the skies. This trend  could make public reports of unidentified aerial phenomena (UAPs) an important source of  information for U.S. government officials. 

This report presents a geographic analysis of 101,151 public reports of UAP sightings in  12,783 U.S. Census Bureau census designated places. The data were collected by the National  UFO Reporting Center (NUFORC), one of the nongovernmental entities that the Federal  Aviation Administration has referenced in official documents for where to report unexplained phenomena. The analyses in this report should not be interpreted as an endorsement  of any individual report or the overall quality of data that NUFORC has made publicly available. This report provides findings on U.S. locations where UAP reports are significantly  more likely to occur and offers recommendations to increase awareness of the types of activities that might be mistaken for unexplained phenomena or that point to potential threats.