针对"丘陵地区"与"山地地区"特征地形因子定量化界分

omestic hilly region and the definition of mountain region and boundary points are mostly expressed in words, lack of accurate quantification of operational methods, resulting in the hilly and mountainous region and its internal environment and land resources development question understanding is not comprehensive at the same time, accurate quantitative boundary points is to implement the strategy of digital mountain hilly area and mountain area, as well as a basic work for the whole national spatial planning on the basis of previous studies, the paper using GIS technology and combining with the DEM data, topographic relief degree cutting depth of the ground surface roughness of the terrain elevation variation coefficient Valleys line and ridge line density of these 6 kinds of terrain factors, respectively, from the selection of the study area to hilly area and mountain region to extract the sample 6 class factor, quantitative analysis and comparative study on the data show that individually extraction, respectively, in hilly and mountainous terrain and cutting depth of the ground surface roughness of the terrain elevation variation coefficient of the ridge line density five factor has a obvious characteristic differences, boundary points and the critical value, can be used as a boundary points hilly and mountainous border factor; However, the extracted catchment line density has no obvious characteristic difference, and the boundary dividing critical value cannot be determined. Therefore, it cannot be used as the determination of critical characteristic factor for the boundary between hills and mountains, which can not only provide scientific basis for the determination of the next critical value, but also provide reference for the digital expression of hills and mountains.