为开展5.12汶川大地震的震后灾情及次生地质灾害遥感应急调查，利用无人机平台和机载光学遥感载荷组成的无人机航空遥感系统，沿龙门山断裂带及其沿线，对地震形成的山体滑坡、崩塌等地貌变化造成的堰塞湖和其他次生地质灾害，进行了高空间、高时间分辨率的低空遥感探测，获取了大量及时、准确的遥感信息。根据收集遥感数据情况，采取了机载定位定向系统（POS）数据处理、正射影像制作与自动镶嵌、次生地质灾害类型分析与解译等航空遥感数据处理流程，完成了以四川省绵阳市安县等为重点的次生地质灾害调查和灾情评估。

In order to complete remote sensing(RS) emergency investigation for 5.12 Wenchuan post-earthquake and secondary geological disaster, the remote sensing data sources were obtained from unmanned aerial vehicle(UAV) aerial remote sensing system, which was made up of UAV and optical RS payload. The data sources got by the high temporal and spatial resolution low latitude RS sounding, were done by a series of data processing flow such as airborne position & orientation system(POS) data treatment, orthogonal projection image making, automatic image mosaic, secondary geological disaster′s type analysis and interpretation. The image interpretation results timely show the disaster situation in the key disaster area (located in An county, Mianyang city, Sichuan province). The important information of the earthquake disaster (afflicted building, landslide and dammed lakes) includes location, boundary, scale etc.