Background Along with deepening of the Ecological Civilization and the reform of Streamlining Administration, Delegating Power, Strengthening Regulation and Improving Services, effective supervising of disposed slags, especially the super large disposal areas, becomes one of the most important technical focuses in soil and water conservation monitoring. At present, based on the combined techniques of remote sensing, UAV and ground observation, monitoring of soil and water conservation has gained great achievements. However, subjecting to limitations of endurance and flying requirements, the existing technologies could not provide real-time and effective monitoring results for super large disposal areas.

Methods Technologies of video surveillance, survey monitoring, ground observation and UAV remote sensing were combined to establish a supervising scheme of soil and water conservation for super large disposal areas according to related technical specification and regulations. Because methods of survey monitoring, ground observation and UAV remote sensing have been proverbially understood by technicians, the key technical points of video surveillance were selectively expounded.

Results 1) First, a general scheme of soil and water conservation monitoring was put forward for super large slag disposal field. 2) Then, the video surveillance technologies were stated from three aspects:information collection, information storage and transmission, and information management and use. Information collection is accomplished by the front-end camera, and the cameras should be arranged reasonably according to the disposal area scene. Information storage is completed by the large capacity storage hard disk installed in the front-end camera. Information transmission is based on the 4G wireless network technology, information is computed to determine timing or selective transmission, and the computation is carried out with the intelligent monitoring software installed in the front-end camera. Information management and use is accomplished by the information management centre. The centre receives, stores, aggregates and analyzes information transferred from the front-end unit camera. Based on the centre, the information from the client unit can be exchanged with that from the front-end camera, and then the client unit may effectively monitor the slag disposed field. 3) Finally, the integration of video surveillance technology and other methods is analyzed. Based on the information management centre, different types of data information are divided into 3 categories:data layer, feature layer and decision layer. The data layer is original information, and the feature layer is formed by logical association of original information, which has a unified data format. The decision layer is the result of soil and water conservation monitoring, which is acquired from the feature layer computation. It corresponds to specific indicators. Based on the decision level, the information management centre outputs the monitoring results of soil and water conservation, including quarterly results, annual results, summative results or thematic results. At the same time, the centre can realize three-dimensional browsing, analysis and in-situ monitoring of the slag field.

Conclusions The established scheme can be used in practical soil and water conservation supervising for super large disposal areas, and it is simple and practical. More importantly, it can effectively improve the monitoring skill of super large disposal areas, as to promote the construction and development of ecological civilization in China.