基于DEM的火山口地貌识别方法探讨

Extraction of Volcanic Landform Information Based on DEM Data

本文以吉林省靖宇县西南部的龙湾火山群为例,进行了火山口地貌图像识别方法探讨。在提取过程中,根据研究区内火山口均位于熔岩台地上的特点:首先,将研究区划分为平原和山地等地貌类型;然后,将生成的坡度数据与DEM高程数据相乘,实现对DEM数据按照地形高低起伏的加权,以突显火山口在高程数据上的表现。根据火山口"中间低,四周高"的形态特点及在DEM上的表现,建立了火山口识别模板,对火山口进行识别。最后,参照研究区内的遥感影像,对提取的结果进行验证和修改。

In this paper,the Longwan volcanic group which locates in the southwest part of Jingyu County,Jilin Province is taken as an example for extracting volcanic landforms information.In the process of extraction,according to the chief feature that the volcanic cones are situated in lava platform,the study area is classified as plain and mountain firstly.Then,the slope data are multiplied by the elevation data,which is similar to weight the elevation in accordance with the relief.It is a way to better highlight the craters in the elevation data on the performance.Taking into account the craters＇ form characteristics,that is,lower in the intermediate,higher on the surrounding,and their performance on the DEM,a template for craters identification can be established.Finally,the results of the extraction need to be verificated and revised based on remote sensing image.