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The Unity Summit, or Cumbre de la Unidad, of Latin American and Caribbean Countries, held in Cancun, Mexico, on February 22 and 23, 2010, claimed clearly to advance toward an organization that encompasses all Latin-American and Caribbean States not including the United States, which is an epoch -- making historical event, heralding that "the Latin American people will jointly create a new history". It is the United States' policies to maintain its own national interests on the behalf of the "common interest" within the existing Pan- American Union that cause the Union to face the economic, political and security vulnerabilities and crises, which lay a solid foundation for an united Latin American and Caribbean Union without the United States. [ABSTRACT FROM AUTHOR]

The key to the study of node deployment in Wireless Sensor Networks (WSN) is to find the appropriate location of the WSN nodes and reduce the cost of network deployment while meeting the monitoring requirements in the covered area. This paper proposes a WSN node deployment algorithm based on real 3D terrain, which provides an effective solution to the surface-covering problem. First of all, actual geographic elevation data is adopted to conduct surface modeling. The model can vividly reflect the real terrain characteristics of the area to be deployed and make the deployment plan more visible and easy to adjust. Secondly, a probabilistic coverage model based on DEM (Digital Elevation Model) data is proposed. Based on the traditional spherical coverage model, the influence of signal attenuation and terrain occlusion on the coverage model is added to make the deployment model closer to reality. Finally, the Greedy algorithm based on grid scanning is used to deploy nodes. Simulation results show that the proposed algorithm can effectively improve the coverage rate, reduce the deployment cost, and reduce the time and space complexity in solving the WSN node deployment problem under the complex 3D land surface model, which verifies the effectiveness of the proposed algorithm. [ABSTRACT FROM AUTHOR]