Hongou Zhang

Learn More
Landsat TM images of the Pearl River Delta taken in 1988, 1998 and 2006 are used to explore the site factors that influence the construction land expansion in this study. Several site factors, including landscape types and the distances to roads, coastlines, or city centers, had significant impacts on the expansion of construction land, influencing the(More)
A practical approach was developed in the study for drought monitoring in Guangdong province of China on the basis of vegetation supply water index (VSWI) and precipitation distance index (PDI). A comprehensive index for assessment of agro-drought severity (SADI) was then established from the normalized VSWI and PDI. Using MODIS satellite images and(More)
g y y t t o o e e v v a a l l u u a a t t e e g g r r a a s s s s l l a a n n d d e e c c o o s s y y s s t t e e m m h h e e a a l l t t h h i i n n n n o o r r t t h h C C h h i i n n a a Abstract. Grassland in north China faces serious ecological degradation in recent decades. Overgrazing and unsuitable farming over the grassland are believed to be the(More)
Within North China there is a special rim zone characterized with a mixture of crop farming and herd grazing. Due to intensive land use for cropping and grazing, natural ecosystems in this semi-arid zone have been seriously destroyed in the past decades. Several strong sandstorms in recent years swept through the zone to invade into Beijing the capital of(More)
Land surface temperature (LST) retrieval from NOAA-AVHRR data is mainly through so-called split window algorithms. During the last 20 years 17 split window algorithms has been published. These algorithms can be grouped into four categories: emissivity-dependent models, two-factors models, complicated models and radiance model. In this paper we intend to(More)
  • 1