Study on Spatio-Temporal Change of Land Use in Tianjin Urban Based on Remote Sensing Data

Understanding of development law and trend for land use change can provide effective data and decision support for the sustainable development of the region. Taking Tianjin Urban as the study area, Landsat TM/OLI images were used. Based on RS and GIS, unsupervised classification and normalized indexes were combined to interpret images. Using single dynamic degree, comprehensive dynamic degree, transfer matrix, and choosing separating index, diversity index, evenness index, spatio-temporal change of land use was analyzed. Results showed that farmland area decreased dramatically. The area of residential land significantly increased. The farmland transformed mainly into the residential land, which showed that rapid urbanization took up a large amount of farmland. The separation degree of residential land reduced. The growth of residential land was more concentrated, and expanded outward from the city center gradually. The comprehensive dynamic degree, diversity index and evenness index of land use decreased.