For mudflow investigating

method of inspecting one by one the scenes of gullies has long been used. It not only gives rise to a great amount of field work

but also is limited by the factors of climate

topography

traffic condition and field of vision etc. So

by this method

it is affected seriously to judge a mudflow gully correctly.Applying aerial remote sensing technology in investigation of mudflows can overcome the disadvantage factors in ground surveying

reduce intensity of work and increase the correctness of judgement. It mainly rely on the characteristic of tones

patterns

veins and hydrographic nets on aerial photos to identify various elements which may cause a mudflow or not. By practice

it is clear that adopting aerial remote sensing technology in the investigation of mudflows has produced good results

so it should be spread out for an extensive use.