Ecological footprint and dynamics of Xi‘an City from 1990 to 2001 Xi‘an Vegetation Dynamics Based on NDVI Research on the cooling effect of Xi‘an parks in summer based on remote sensing Dynamic analysis of greenhouse gas emission and evaluation of the extent of emissions in Xi‘an City, China Characteristics of spatial and temporal variations of global solar radiation in Xi‘an and relevant response in urban development Impacts of urbanization on urban agricultural landscape-A case study of Chang‘an District, Xi‘an City