Development of a Internet/Distributed Image Database System for Multi-sensor and Multi-source Imagery/Raster Data
Takahiro Endo*, Shiro Ochi**, Mitsuhiro Tokunaga**, Royosuke Shibasaki*
*Center for Spatial Information Science,
**Institute of Industrial Science
University of Tokyo
7-22-1, Rappogi , Mnato-Ku, Tokyo 106-8558, Japan
Tel :+81-3479-2762, fax . +81-3-3408-8268
E-mail: endo@skl.iis.u.-tokyo.ac.jp
Abstract
In recent times , a variety of imagery/raster database have become available, such as space-borne sensory data, aerial photographs, digital evaluation model data and land-use data. Hence, as datasets distributive are managed by each many researchers and organization , it has been quite difficult to search data a satisfying specific for use's requirements such as location , time , resolution and so forth. The authors are developing a distributed database system which allows users to retrieve data from a distributed ftp sites across the internet.
This paper describes overview of the database system . the database system will be used for searching Landsat TM and other of SE Asia an support of land-use mapping project .
1. Introduction
At present time, as lots of remote sensing satellites have been launched all over the world, resulting in researchers using many space-borne datasets, aerial photographs and DEM . in addition to using such images, it is also possible to additional data like geographic information as GIS. Further, recently sensor resolutions are on the rise and also have multi-spectral bands. Thus resulting in large volumes of data of such sensors and its acquisition becoming expensive. Hence the author considers that if and image database system that manages many spatial metadata and images existed, the system would be advantageous for lots of researchers. For example, the system could reduce the time that it takes of researchers to search datasets needed.
The author has developed the image database system that is able to manage some spatial datasets and run a service that user can simultaneously find out the availability of remotely sensed data of the given location from different sensors like Land sat TM and others.
2. System Overview
2.1 Hardware and software components
our system is running as a Client -server-system.
Fig. 1. Shows the composition of the system of database.
- Hardware
- DB Server : DEC Prioris MT 6200
(CPU Pentium Pro 200 MHz, RAM 64 MB , HDD 3.6GB)
- FTP Server :SUN Ultra-1
(CPU Ultra-sparc 167MHz, RAM 128MB, HDD 45 GB)
- Software
- OS : Windows NT server 4.0, Solaris 2.5
- DBMS : File Maker PRO 4.0
- Web Brower: Internet Explore 4.0 and Netscape communicator 4.0
- Language :CGI (perl 5.003 for win 32 and JAVA Script )
- Sample Database
- Landsat TM (7 bands =: 1 band =5305 MB , CD-ROM, SE Asia area )
- Landsat MSS ( 4 band : 1 band =14.2 MB , CD-ROM, SE Asia area
- DEM (1 km)
Fig. 1 System Configuration
2.2 characteristic of the system
- uses can simultaneously find out different sensed data with the given location. The retrieve system on this database is based on a representation of satellite image/raster data and a retrieve method. The representation of satellite image/raster data and a retrieve method. The representation of satellite image/raster data is represented with a latitude/longitude coordinate of four corners of satellite image and of convex of raster data. The retrieve method used a rectangular envelope with the coordinate of convex.
- As our system is can e used over the currently available WWW browse software such as Internet Explore or Netscape communicator, users don't need any special software. The data retrieval system is independent of the OS of the user's machine
- The load on the sever is at a low level, because this server manages only metadata as text strings and images are managed by a file server system on other machines.
- The administrators of this system are able to manage the database on remotely over t network. Hence, when researchers are going to supply database , they can access the database at anywhere places.
