4,000 Chinese islands under 3D watch

China has adopted three-dimensional (3D) visual management over 4,000 islands, according to an annual report released Thursday by the Ministry of Land and Resources.

Three-dimensional visual information of these islands is collected via ground vehicles, airplanes and satellites.

Meanwhile, 2,851 islands have been put under aviation monitoring and surveillance, and 45 islands along baseline points of China's territorial waters are under ground watch, the report said.

All the historical data of Chinese islands have been processed and put into a database to strengthen island management, the report said.

The government last year also released its first list of uninhabited islands available for development in the country, the report said.

According to the report, China's ocean-related industries totaled 4.56 trillion yuan (US$724.49 billion) in output in 2011, an increase of 10.4 percent from a year earlier.

The figure accounted for 9.7 percent for the country's total GDP, the report said.

The share of ocean-related industries in the Pan-Bohai region stood at 36.1 percent, while that of the Yangtze River Delta and the Pearl River Delta was 30.1 percent and 21.5 percent, respectively, the report said.