Landuse Rs Monitoring in China

Following rapid development of economy in China, great changes also take place in landuse status, especially in the urban area. In order to quickly and truly acquire the information of landuse changes and status in quo, aid the government to scientifically manage the land resource, National Land and Resource Department executes a Landuse RS Monitoring project that began from 1999 and will keep for 12 years. Based on RS data of multi-sources, multi-resolutions and multi-phases, 93 important cities with more than 500,000 populations are monitored using advanced 3S technologies. The article introduces the key technologies of landuse monitoring, including ortho-image production, change automatic detection and fusion methods of multi-sources RS data, etc. The article focus on describing the working flow as below: (1) Choice of RS data: how to choose the best data from multi-source, multi-resolution and multi-phase RS data for different aims; (2) Processing of RS data: introduces the rectification model, GCP distribution rule and fusion method for different RS data; (3) Detection and extraction of changes: introduce the automatically change detection methods, and semi-automatic change extraction methods; (4) Investigation in the field: introduces the aim and means for investigation in the fields; (5) Post-processing. In order to get high quality production, the article also gives the reasonable precision indices for key steps. Finally, the article points out the problems and gives the prospect of this project.