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GIS are shapefile of Arc View GIS tools in vector-
formatted data and GRID/ERDAS IMAGINE ing files
for raster format data.
3. OPERATION OF THE GIS FOR CLEARING
OF OIL SPILLS
In our system, the GIS software is installed in the server
system, and therefore the general public can access and
operate the GIS through the Intemet. The reason for
installing the GIS software onthe server side is to fiee the
general public from the expense of software purchase. It
was anticipated that economic considerations might prevent
people from accessing this system thus creating difficulty
with information integration In other words, we considered
that financial pressure might prevent the production and
storage of data and the creation of a self-proliferating
database.
Therefore, clients can easily access the server on the Internet
using the Internet Explorer or Netscape web browser. In
addition, they can utilize the GIS using portable
communication devices (PHS, portable telephone.)
As the information is constantly changing, it is important to
renew the data on both the user and server sides after data
processing. Therefore, Intemet GIS/mobile GIS is an
essential tool for input/output of the latest information in the
area of the disaster. Of the above subsysterrs, nos. 1 and 3-4
work on the GIS through the Internet. Subsystem 2 is a
stand-alone system, operating on the server side. In no. 2, an
image analyzed by the network/Intemet GIS administrator
on the server side is put on the Web. Naturally the system
can be made available and utilized at any time. The
relationship between the general public's web browsers and
the server side with the Intemet GIS is shown in Figure 1.
The private citizen sends a command to the GIS server at
the National Institute for Environmental Studies to access
the Internet GIS and obtain relevant geographical
information on the Internet.
Client Sarverside
general public's browser Database and GIS soft ware
El. N
D 700 WebfT* [fo
ri HTTP -
o *ERTIP,E*], A, Affe f^,0 09M. L
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Fig. 1 Relationships between browser (client) and server site
Figure 2 shows the ideal hardware composition on the GIS
server side. The input system components such as a
digitizer, scanner and plotter are still lacking on the server
side at this institute. However, we can use these devices if
necessary, because we can input information through the
LAN using these devices connected to the other system.
Fig. 2 Hardware composition on the GIS server side
Figure 3 shows he flow of information in the support
system for volunteer activity. Since the input information is
limited in this subsystem, a link to the headquarters from the
server side has been established, making it possible for the
generalpublic obtain detailed information
from the regional headquarters using their home pages.
On the server side, the administrator manages volunteer
headquarters’ registration, data processing of volunteer
attributes, prediction of oil drift, and putting the results on
Generalpublic
7 E] EHI.
337
m
Internet
ESI
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= ) OA
Fig. 3 How of information in volunteer support system
the Web for our Intemet GIS. At the headquarters'
registration, information input and renewal are carried out
after the distribution of a name and password that is
permitted only at each volunteer headquarters.
(1) Display of geographical information
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B1. Amsterdam 2000. 337
