Abstract: The forest fire location based on video detection is the key technology for fire monitoring. This paper puts forward the method of positioning forest fire through combined with a single image taken with video monitoring or camera,3D attitude angle surveyed by three-dimensional electronic compass, and the DEM data of the subject area. It is proved that the fire point location accuracy can be controlled under 100 m through theoretical simulation analyzing and field experiments beyond the gross error zone. This method can satisfy the requirements of the forest fire point positioning accuracy. However, the detection accuracy is not high in the gross error zone, the precision can be correlated with the survey accuracy of the 3D attitude angle by the three-dimensional electronic compass, the camera’s interior orientation elements and DEM.

Key words: positioning forest fire-point, collinearity equation, single image, DEM, three-dimensional attitude angle