Mr. Sen Zeng Profile

Sen Zeng

at Chengdu Univ of Technology

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Proceedings Article | 18 November 2014 Paper

Dynamic monitoring of vegetation coverage change in Lu County based on TM/OLI-NDVI

Sen Zeng, Hanhu Liu, Tao Chen

Proceedings Volume 9299, 929912 (2014) https://doi.org/10.1117/12.2073018

KEYWORDS: Vegetation, Lutetium, Agriculture, Remote sensing, Mining, Atmospheric corrections, Statistical analysis, Analytical research, Earth observing sensors, Landsat

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TM data of 1998, 2002 and OLI data of 2013 were chosen in Lu County. Fractional Vegetation Cover of study area was obtained based on the basic processing of data measurement ascertaining atmospheric correction, the retrieval of surface albedo and the calculation of Normalized Difference Vegetation Index (NDVI) in this research. Spatial differences and influencing factors of Fractional Vegetation Cover in Lu County over past twenty five years were obtained through statistical and analysis. Studies have shown that vegetation cover changed for the better in the 35.62 percent areas of Lu County from 1988 to 2002 and 15.54 percent areas changed for the worse. The main factor that vegetation cover changed for the better is the change of imaging time. Significant increase could be found in vegetation cover because rice was not harvested on August 5 in 2002, but the opposite of September 5 in 1988. Meanwhile, scattered residential building construction in the southeast, agricultural land and mall-scale urban construction in the southwest could be main factors that had made vegetation cover changed for the worse. From 2002 to 2013, vegetation cover changed for the better in the 12.29 percent areas where located in the southeast of Lu County mainly because regional vegetation change. Meanwhile, vegetation cover changed for the worse in the 39.28 percent areas mainly because a large number of urban construction and mining development area in the middle and west and a large number of new scattered residential and agricultural land in the west and east.

Proceedings Article | 18 November 2014 Paper

The vegetation coverage dynamics due to geohazards after the 2008 earthquake in Wenchuan

Hanhu Liu, Sen Zeng, Jianming Xu

Proceedings Volume 9299, 92990E (2014) https://doi.org/10.1117/12.2070644

KEYWORDS: Vegetation, Earthquakes, Remote sensing, Image restoration, Landslides, Landsat, Sun, Earth observing sensors, Satellites, Satellite imaging

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A catastrophic earthquake with a Richter magnitude of 8.0 occurred at Wenchuan area of Sichuan province on May 12, 2008. The earthquake destroyed forests and natural vegetation. As a result, it is necessary to assess the vegetation recovery rate for decision making and policy planning in earthquake region. In this paper, we calculated the vegetation index in 2001, 2009, 2010, 2013 employing RS methods. According to the analysis of mean change trend of vegetation index, the vegetation index in 2009 was clear lower than that in 2001, the main reason is that the vegetation loss caused by the 2008 Wenchuan earthquake; the vegetation index mean in 2010 was lower than that in 2009, and image imaging at different times, vegetation index mean reduction is caused by seasonal changes; the vegetation index mean in 2013 is slightly higher than that in 2010, it showed that vegetation coverage began to be slowly recovering after the earthquake. According to the standard deviation of vegetation index, vegetation index has the smallest standard deviation in 2001, this showed it has a good homogeneous distribution before the earthquake; vegetation index has the largest standard deviation in 2009, indicates poor homogeneity after the earthquake; from 2009 to 2010 and to 2013, the standard deviation of vegetation index becomes smaller year by year, means that the homogeneity becomes better and vegetation cover also slowly get better. We anticipate that these results will be helpful in decision making and policy planning for recovery and reconstruction in the earthquake-affected area.

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