This paper discussed the methods to create hydrologically correct DEM(Hc—DEM) at medium resolutions for Jiangxi Province using 1∶250 000 topographic maps and ANUDEM software.The quality of the DEMs was further assessed.The data preprocessing

the determination of the key parameters and others for Hc—DEM creation were addressed carefully.In addition

contour line overlay analysis

random checkpoint analysis and stream network analysis were adopted in evaluation of Hc—DEM quality.The results show that based on the topographic information of the existing digital topographic maps(including contours

spot heights

and streamlines) and the application of ANUDEM software

high-quality DEM representing the correct relationship between the stream networks and the geomorphology could be created.The quality level of constructed DEMs reached the USGS standards.The created DEM had the resolution of 50 m

iteration number of 30 and the second roughness coefficient of 0.5.