Abstract：Two calculating methods of DEM-based Grid data structure for flood area have been
proposed , and one of the calculating methods called “ flood submersion ” is quite characteristic . The
accuracy of flood area is mostly dependent on the contour interval of map, accuracy of digitizing map,
accuracy of DEM , and interval of GRID, detecting resolution of pixels. The smaller contour interval,
the fewer errors of digitizing; The denser interpolating of DEM, The shorter span and the higher
detecting resolution, the higher accuracy. The efficiency of the presented algorithm model is influenced
by the detecting resolution and spatial data gross . Finally , the key technical method of virtual reality
and visualization of flood area with OpenGL is discussed. Some practical applications for the given
model implemented in the Water Conservancy Management Information System are provided in the last
sections, which show that the model and algorithm are effective.
刘仁义, 刘南 . 基于GIS技术的淹没区确定方法及虚拟现实表达[J]. 浙江大学学报（理学版）, 2002, 29(5): 573-578.
LIU Ren-Yi, LIU 南 . Study of GIS-based calculation of flood area and visualization of virtual reality. Journal of ZheJIang University(Science Edition), 2002, 29(5): 573-578.
2002, Vol. 29 
