3. Application of spatial information technology in natural disasters
3.1.sters survey and identification.
Remote sensing has a unique to natural disasters survey and monitoring, particularly to geologic
hazards, there are efficient and results visualization advantages on the extraction of disasters information.
We can qualitative and quantitative analysis relational data of disaster region by special information
technology, and the spatial information technology can provide detailed and comprehensive information
for control of different natural disasters, but also can provide scientific basis for the research of disasters
development trend. At present, using remote sensing technology to investigate geological hazards in
China, we mainly use remote sensing information sources, mainly by visual interpretation, supplemented
by computer image processing, and the remote sensing interpretation results of key region combined with
field testing, and using other non-remote sensing data, access to reliable survey results by comprehensive
analysis [3]. Using remote sensing technology to survey and research geological hazards, we can guide
the detailed field survey, reduce work time, play a multiplier effect, and identify risks of geological
disasters and their distribution characteristics from the macro, it is an important theoretical basis to
geological disaster prevention and plan. We can convenient obtain earth tectonic, geomorphology, water
and vegetation parameters of typical geological hazards point, we can also find the work surface
geological phenomenon that can not or difficult to find by other methods, can as well as find the
relationship between various phenomena to solve the problem of general ground methods powerless. Due
to various natural disasters mainly occurs in rain and snow, and often with sudden characteristics, which
in bad weather conditions, sudden disaster is difficult to make the findings to real-time, true and accurate
if by the traditional methods of investigation, but we can use spatial information technology to investigate
disasters, it has many advantages, such as timeliness, macro-strong and informative. In particular, radar remote sensing also has the through the clouds and fog advantage, and the weather conditions are not
affected, we can real-time and accurate investigate the status of unexpected natural disasters in order to
provide accurate information on relief efforts.