The evolution stage decision of Danxia landform based on digital elevation model(DEM)
Based on the ASTER DEM data,this paper adopted hypsometric theory to study the quantita-tive representation of the evolution stages of Danxia landform.The result indicates that the hypsometric curve is changed from convex to concave with the development of Danxia landform from young to mature, and the concave features are gradually strengthened, while the HI value is getting smaller and smaller, which is consistent with the law of Danxia landform evolution.Based on the comparative study of different sub-zones in the same Danxia landform region,hypsometric curve and index can reflect the multi-stage e-volution in the same Danxia landform region.In addition,the comparative study of the same area shows that there is a general scale effect in the evolution phase of Danxia landform,which needs to be fully con-sidered in the calculation of hypsometric curve and index.
Danxia landformDEMhypsometryevolution stagequantitative research