The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part B4. Beijing 2008
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spatial data is unified to save in the object oriented and
relational database.
2.2 Data Organization
SAR orthographies, the main data of the system, and some
other auxiliary data such as vector data, DEM and the
parameters of SAR reference images are the data source of the
database.The model of SAR reference image database is
defined based on the logical structure and the GeoDatabase
model, which can be seen from figure 1. It is divided into some
sub-database, like DOM, DEM, DLG and the database of
property. Raster data is organized by raster catalogs.
Othographics of each region is treated as a sub-database of
DOM, and each image is stored as a dataset. DLG is composed
of different scales, and is stored by geographical features. Each
geographical feature is made up of point, line and polygon. The
hiberarchy of the database is clear, and it is easily to update
data and is used to organize and manage massive data.
SAR
Reference
Image
Database
— region 1
DLG
— region 2
i— block 1
— region n
1:5000
Property
ImgParaTable
User Table
boundary
gep
traffic
Polygon
Figure 1 Logical Structure of SAR Reference Image Database
3. DESIGN AND IMPLEMENTATION FOR SAR
REFERENCE IMAGE INFORMATION INSURANCE
SYSTEM
3.1 Objective of the System
The objective of the system is to build a database using GIS,
network and database technology to manage data of
experimental regions with military value. The key task is to
organize, store, manage, query, and analyze the data, which will
support for decision making.
3.2 System Framework
C/S pattern is used in the system, and three- tier structure is
adopted, that is the data tier, where Oracle is used to store
multi-source data, the logical tier, where ArcSDE is used to
connect the user and the database, and finally the application on
the client developed by ArcEngine. By using this mode, the
access to the system can be controlled and the data can be
backup and restored to keep the consistency and integrality.
Data Processing
Data Management
Figure 2 System Framework
3.3 Function Modules of the System
Reference images, the fundamental data of the system, are
geocoded orthographies with geographical coordinates after
processing with original images. They can be organized and
managed with other relative data by SAR reference image
database. Meanwhile, the flight path and the optimal route can
be planned by spatial analysis, which can make the exact spy
and strike come true. Based on data management, decision
making and data processing, this system is designed for 6
function modules like data import and updating, data view,
query and index, spatial analysis and system maintenance. See
figure 3.
3.4 Implementation of the system
When user login the system, the username and corresponding
password is checked. Users of different levers are granted with
distinct privileges by administrators, with which they can
access and manipulate the data in the database. Figure 4 shows
the interface of the system.
Figure 4 the interface of the system