DMC数据在土地利用动态监测中的应用分析——以北京市大兴区为例

The Application of DMC Data to the Land Use Change Dynamic Monitoring——Taking Daxing District of Beijing as an Example

近年来北京市发展迅速,土地利用变化显著,大兴区尤为明显。本文利用大兴区的4期TM影像和1期DMC数据为数据源,采用全数字人机交互判读对影像进行了分析和判读,得到不同时期的大兴区的土地利用图,对大兴区近20年来的土地利用变化进行了监测。以TM影像的判读结果为基准,对DMC数据用于土地利用动态监测中的应用进行分析。

Urban land use change is one of the most significant expressions of land use and land cover change （LUCC）. Urban expansion is the major form of industrialization and urbanization. Disaster Monitoring Constellation （DMC） is an international small satellite organization composed of seven countries. The data resolution it received is 32m. DMC can supply images of any place in the world and update the data fleetly by passing by the same place fluently each day. This paper based on DMC data and Landsat TM images, analyzed the structural features and spatial patterns of land use change in Beijing in the past 20 years. These TM images and DMC data were geo-referenced and orthorectified, using field-collected ground control points. A hierarchical classification system of 25 landcover classes was applied to the data under the support of Intergraph MGE （Modular GIS Environment）. The interpretation method of TM images and DMC data adopted is manual interpretation, which is intensive and time consuming but can ensure high classification accuracy. Finally, based on the above data, the effect of DMC data in land use classification and change detection is evaluated such as the classification accuracy and the spatial veracity.