中國有色金屬學報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 21 Special 3 December 2011 |
on VBSI vegetation index in Kaixian county
（1. College of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo 454000, China;
2. College of Geographic Sciences, Chongqing Normal University, Chongqing 400047, China）
Abstract:Based on the mixed pixel model, the vegetation fraction of Kaixian county, China, was extracted with three free CBERS images. VBSI vegetation index suitable for CBERS images constructed with FCD (forest canopy density) model principle was put forward by ITTO (International Tropical Timber Organization) was used, considering the underestimation of vegetation fraction using NDVI in low mountain-hill region influenced by soils and shadows. And vegetation fraction was divided into five categories from low to high in order to study the special variation of vegetation cover. The results show that the vegetation cover of the region is overall good, with an average of 50%. The area of vegetation fraction below 30% accounts for 11.7% of the entire studied area, mainly concentrates in central eastern Kaixian county, where is the major development zone of cities and towns; that between 30% and 60% accounts for 62%; and that higher than 60% accounts for 26%, and mostly locates in northern middle-mountain area.
Key words: VBSI vegetation index; mixed pixel model; FCD model; CBERS
