Recently, China TopRS Technology Co., Ltd affiliated to the Department of Information Service of the National Remote-sensing Center signed an agreement with Changjiang Institute of Survey, Planning, Design and Research to undertake the aerial photo-taking task for Xiluodu and Xiangjia Dam Hydraulic Power Station Reservoir area. This project covers approximately 3400 square kilometres including the area below the reservoir land acquisition line and bordering areas. According to the agreement, the aerial photo taking and mapping task for the reservoir central line area should be completed before the river damming time that is in September 2007.