Geoinformation for Disaster and Risk Management - ISPRS

Image acquisition
Within two hours of the earthquake, NDRCC sent
requests for EO images of the earthquake affected
area to international and domestic data providers.
The requests for international data acquisition were
sent to the International Charter “Space and Major
Disasters”. The domestic acquisition requests were
sent to the satellite image owner institutions and
agents by fax and phone. The first two images were
acquired within 24 hours of the requests. A total of
1257 images from 24 satellites and 12 countries
were acquired, which included 622 images of archive
image and 635 images of newly acquired images;
138 images were kindly provided by International
Charter “Space and Major Disasters”, and the others
were supplied free-of-charge by more than ten
domestic agencies, as listed in table 1(Yida
Fan,2008).
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Figure 4: Index map of all the
acquired images (Suju Li, 2009).
Figure 5: Landslides, destroyed road and quake lake monitoring
map in Pingtong town, Pingwu county, Sichuan province
Figure 6: Location map of people evacuated in Mianzhu City,
Sichuan province
Airborne remote sensing images of the
earthquake affected areas acquired by
the State Bureau of Surveying and
Mapping of China (SBSM) and Chinese
Academy of Sciences, unmanned
airborne remote sensing images
obtained by NDRCC, field investigation
information obtained from field teams,
and daily statistic disaster information
data acquired at county level from local
governments, were also gathered and
integrated.
Data processing and map making
Data preparation
Background data preparation
According to the disaster assessment
requirements, the background data such
as geographic data, spatially relating
social statistical data and images of the
earthquake affected area, were
formatting-processed and uploaded into
the comprehensive spatial database in
NDRCC, for subsequent information
extraction and applications. Before
observing the acquired images, preassessment
maps were produced based
on the background data which gave the
decision makers the preliminary details
about the people and economic loss
assessment.