The principles, methods and process of automated extraction of natural stream networks of watershed based on raster DEM are described.
论述了如何基于栅格dem自动提取流域自然水系的原理、方法和流程。
For the building shadow in downtown area, it adopts the Shadow Automated Extraction Method of IKONOS Images Based on Image Fusion to extract and the Lamber model to rectify;
对城区建筑物阴影，采用基于影像融合的IKONOS影像阴影自动提取方法对阴影进行提取，再采用郎伯模型进行校正；
One advantage of list-based extraction is that the word lists often come from trusted sources, which means its creation and maintenance can be automated to a certain degree.
基于列表的提取的优点是，词汇列表常常来自可信的源，这意味着它的创建和维护可以实现一定程度的自动化。
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