Application Of Multi-source Remote Sensing Data In Geological Disaster Analysis

Debris flow,landslide and other geological disasters are sudden and strong.Remote sensing technology can extract abundant information of geological hazards,and has strong macroscopic characteristics.This paper takes the middle and lower reaches of the Jinsha River(G47E011018,G47E011019)Valley as the research area,the tectonic movement has been active since the late Cenozoic in this region,and it has been developed in the first line of the chenghai fault zone,which is prone to geological disasters,which seriously endangers the safety of life and property of local residents.Remote sensing has the characteristics of macro and high efficiency,and it is of great practical significance to use multi-source remote sensing data to interpret geological disasters in the research area.This paper selects SPOT-6,World View-2,ETM+ remote sensing data of different phase and reference to Google earth image,and makes digital image enhancement by image stretching,band fusion,principal component analysis,Tasseled Cap Transformation and so on.The disaster set up the interpretation mark and interpret the translation by remote sensing.Combined with field investigation and verification,the development law of geological disasters in the study area has been systematically studied,and the following results have been achieved:(1)For remote sensing data such as SPOT-6,World View-2 and ETM+,the digital image enhancement methods,such as image stretching,band fusion,principal component analysis and Tasseled Cap Transformation,are selected.The combination of the laws of all parties can play a complementary role in rendering better visual interpretation.(2)To establish remote sensing interpretation of debris flow and landslide geological hazard,the geological disaster is interpreted by remote sensing of two images in the study area,and 29 landslides and 28 debris flow gullies are interpreted.The remote sensing interpretation of geological hazard in the study area was completed.(3)In the field verification of the interpretation of geological disasters,33 of them are at the checkpoint,29 of the debris flow checkpoints,62 of them,and the accuracy of the inspection is over 90%,and the interpretation results are great.(4)the geological calamity is verified in the field.and the development characteristics and distribution rules of geological disasters in the middle and lower reaches of the Jinsha River are preliminarily revealed:The main types of geological hazards in the study area are landslides and debris flows,which are mainly distributed along two main lines:(1)the development along the Cheng Hai fault;(2)along the coast of the Jinsha River.The main controlling factors are Cheng Hai fault zone and human engineering activities.