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Indicators of mine presence and absence are the main objects on the scene that need to be detected and spatialy positioned for the purpose of conducting quality aerial non- technical survey of suspected hazardous areas (SHA). Detection of these indicators on the images of the observed scene and positioning of the existing indicators from the mine information system (MIS) enables creation of danger map. Danger map is the result of the fusion of all existing data about mine indicators. Experts of warfare and mining in a particular area can bring conclusions on potential areas that are contaminated by mines on the basis of danger maps. However, the possibility of recognition and extraction of mine presence indicators on aerial and satellite images greatly depends on the image quality and corresponding ground sampling distance, as well as contextual knowledge and experience of mine scene interpreter. Therefore, due to the fact that the experts draw conclusions about SHA based on position of indicators in space and their zones of influence on the environment, it is necessary to add a level of confidence (the level of reliability with which the interpreter evaluates its decision) for each extracted indicator. This information is essential for a more realistic appearance of danger map depending on the available data on the observed scene and from MIS. The confidence of the decision that has been detected and extracted indicator of mine presence affects the level of danger of an area on the danger map. Tools used to automatically extract indicators on the mine scene can be validated in this way. Validation is done based on the true data about mine scene. Internal validation can be carried out by an experienced interpreter of mine scene, while operational validation will be performed after demining of the observed scene.

Survey and definition of mine suspected area (MSA) of all territory of Republic of Croatia was conducted the by employees of Croatian mine action centre (CROMAC). However, due to the lack of information and in order to reduce the risk for the local population MSA was defined in larger dimension. In the following years, when after MSA was defined, CROMAC was updating it's mined information system (MIS) with new information and did permanently reduction/extension of MSA in accordance with the mentioned information. The multi-sensor system for reconnaissance and surveillance, and decision support system in conditions of uncertainty provide help in collecting and process new information for purposes of humanitarian demining community in Croatia. Requirements for new information on objects that are present on the scene are defined in collaboration with experts from CROMAC. Collecting and processing information are carried out according to those requirements. Collecting information with multi-sensor system is performed in order to find and position an object which was assumed by the experts that can be defended/protected with mines (indicators of mine presence - IMP) or an object for which experts assumed that can be free of mines (indicators of mine absence - IMA). In the conditions of uncertainty, the data fusion of all available data (MIS, GIS, ortho-photo, (war/military) maps, aero-photo images, multi-spectral images, satellite images, contextual data, common and expert knowledge) is used within decision support system. Result of the fusion is a thematic map which displays impacts of all indicators onto their environment and their mutual impacts onto each other. Such map is called a danger map, and it displays degree of danger around indicators within some specific MSA. This thematic image (danger map) is used as help to experts in humanitarian demining for better definition and reduction of MSA. Above mentioned systems were used in three locations in Croatia, and this article will present some results of this processing.