Up to 1949, wetlands stretched continuously and accounted for 80.17% of the total area ofplain part of the Sanjiang Plain. However, wetlands in the plain have g
Through high-resolution research of sedimental chronology and the sediment environmental indexes,such as graininess ,minerals,magnetic parameters,pigment conten
The urban thermal distribution characteristics and its variationare dynamically monitored and synthetically analyzed by using GIS technology. The meteorological
By using digitized land use maps of Beijing in 1982, 1992 and 1997 and employing GIS spatial analysis techniques, this paper conducts an empirical study on the