TY - SCIENTIA GEOGRAPHICA SINICA A1 - Yong-gang CHEN, Guo-an TANG, Yi ZHOU, Fa-yuan LI, Shi-jiang YAN, Lei ZHANG T1 - The Positive and Negative Terrain of Loess Plateau Extraction Based on the Multi-azimuth DEM Shaded Relief Y1 - 2012-01-20 11:45:37.147 JF - SCIENTIA GEOGRAPHICA SINICA JO - SCIENTIA GEOGRAPHICA SINICA SP - 105 EP - 109 VL - 32 IS - 1 UR - {http://geoscien.neigae.ac.cn/EN/10.13249/j.cnki.sgs.2012.01.105} N1 - 10.13249/j.cnki.sgs.2012.01.105 ER -