TITLE:
Dynamic Modelling of VFC from 2000 to 2010 Using NDVI and DMSP/OLS Time Series: A Study in Guangdong Province, China
AUTHORS:
Seyed Omidreza Shobairi, Mingyang Li
KEYWORDS:
VFC, Light Index, Human Activity, Dynamic
JOURNAL NAME:
Journal of Geographic Information System,
Vol.8 No.2,
April
25,
2016
ABSTRACT: Forest cover change is
considered one of the serious issues in the last several decades for the global
environment. This scenario has mainly depended to ever-increasing
socio-economic activities. The present article has revealed major changes of
VFC in relation to human activities during the years of 2000 to 2010 in the
Guangdong province of China. The data derived using the NDVIimages. The
analysis covered the growing season which consisted of seven months (April to
October) annually. VFC (Vegetation Fractional Cover) was successfully
calculated from NDVI images and VFC levels were defined in four levels. Levels
IV and I had the highest and lowest annual changes. Areas at risk of
desertification and difference coverage were determined by Hot Spot and Cold
Spot analyzing. Mean of total VFC was evaluated 0.783 and Moran’sIstatistic calculated for years
separately. Additionally, Light Index achieved of DMSP/OLS data annually. The
results show that VFC and Light Index have an upward trend, which means that
development of social economy leads to increasing awareness of the importance
of environmental protection and sustainable development. Hereof, we witness
seven-year increase of VFC during the eleven years. The correlation
co-efficient shows that Light Index is suitable index for evaluating diving
forces. Time series modeling confirms that there is strong inverse relationship
between the VFC and Light Index in most cases. This means with increasing Light
Index, VFC decreases. Finally, driving forces of VFC variation show that forest
cover change scenario is more under the influence of the human activities.