During the process of scanning, when finding dubious phenomena, the PTZ parameters can be adjusted to clearly observe and analyze the video images to detect forest pest disasters. Then, combined with DEM and the angles of azimuth and pitch of the PTZ camera, the geographical coordinates of the disasters can be obtained through the positioning algorithm. Then the disaster information is stored into the disaster database. Users can query disaster by single field or multifield, and the query results can be simultaneously visualized in the 2-D view. In addition, the thematic map can be conveniently output and printed, to aid forestry surveyors to conduct field verification. Furthermore, the 2-D view, 3-D view, and video view can interact with each other. For example, when the user selects a monitoring point, the 3-D view and the video view will transform accordingly. Thus, the user can monitor the on-site situation in real time to detect forest pest disasters timely and accurately. In addition, the thematic map can be generated and printed, providing great convenience for the foresters to conduct on-site verification.