The Use of Dual-Threshold Extraction of Waters Based on LIDAR Data

It is a difficult task for shadow and feculent water area processing when extracting water body from remote sensing image by traditional methods. Light Laser Detection and Ranging (LiDAR) is robust to gain point cloudy data from shadow and feculent water as it has less affection from that area. However, the point cloudy data is always with low resolution which results to contour line with low accuracy. A new approach called dual-threshold for water body extraction is proposed to improve the accuracy. Experiments results indicate the contour lines obtained through this way are accuracy and with details. The accuracy of water body extraction can reach 98.6%.