International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004
4 S 8 1 ^
highest level is the small-scale national SDI of China, the
Interna
TAE
kernel of Digital China. ut Size | Online a
atype | (GB). | Size(GB) Note
: ieit: „| Image —— , 186 , — 162 | With dm resolution ;
4.1 Disital Sheuzhen | Vector, raster | 8 "25m grid E David
; Les ; : ; 1 | Image — } Im resolution ortho-image Global
Use the SI (Systeme Digital Shenzhen is an integrated intranet 4 | 6 bands of 30m resolution, :
x Y CE in . . = A DOM-TM30 | Image 42 | tah Stakeh
system for 3D city visualization and analysis system a BL bn SE
. > a à Tatiana : .DOM-SIO | Raster | .25 | Panchromatic, 10m —
implemented by GeoStar. The data is stored in Oracle and Tew fever 50 10422 million poiste 77 Deren
managed by GeoStar Spatial Data Controlling Components. Vector S6 | Key elements, no contour — on Inte
The client-side includes CCGIS modeling tool and 3D browser. en A A| Yamllion items. Works
I I-ti del . ce d dati I Raster, vector 30 10 { 30m resolution _ = d OTKS
t supports real-time mode! creating an "p ating to the Me mw | 14 | Ww T IIS, the
database. The 3D browser can be deployed in any machine of ho du S i
the intranet. It manages 1:500~1:5000 multi-scale image, vector, Sume D "erm |. encn Deren
DEM and 3D models. The total data size is near 100GB. Fig 5 China
is a snapshot of flying through a partially finished urban area in : n Univet
Dieital Shenzhen Table 1. 1:50,000 databases for National SDI of China als
g :
4.2 SDI of Guangdong Province Fig. 7 shows that there are eleven 6° projection zones. GeoStar Deren
solved this problem and the end user can seamlessly roams Earth,
The dominating scale of provincial level SDI is 1:10000. In the across neighbour 6° zones. Earth,
project of creating SDI of Guangdong Province, we imported Beijin
several-hundred GB image data, graphic data and DEMs at
scales from 1:10,000 through 1:250,000. The images are joined Good
into seamless database at several scales. In some most active Resea
areas, even 1:500 images are included. All these data are stored on Dis
in Oracle and managed by GeoStar Spatial Data Controlling Press,
Components. A lot of applications have been developed based
on GeoStar COMs and ActiveX controls for various purposes. Konec
Fig 6 is a snapshot from the view tool of the system. Infras
the In
Nov.3
Gore
the
Fi o a eis http:/
ig 7. The 6" projection zones of China
| ; ; http:/
All the spatial and attribute data are stored in Oracle and
managed through the GeoStar Spatial Data Controlling
Components. The project is expected to be finished in 2004.
The DEM and DRG databases have been completed while DOQ
and DLG database are on the way of creating.
This
5. CONCLUSIONS infor
2003
: : s : Exce
The achievements in the technology of fast collecting GIS data 2002.
Fig 6. Integrated view of image, DEM and vector data in SDI of
Guangdong Province
4.3 National SDI of China
The national level SDI of China includes image, vector and
DEM in three scales: 1:1,000,000, 1:250,000 and 1:50,000.
Table 1 shows the number of layers and data size of 1:50,000
scale in this system. The total size in this scale is 10TB and
671GB of this dataset is online over the Internet.
and the demands to explore more from geographic information
bring new chances and challenges to the R&D of GIS software.
The history of conceptual evolution from NII, NSDI to Digital
Earth also implies the future of GIS software. A lot more efforts
are expected in how to address multi-scale, multi-resolution,
multi-source, multi-temporal, multi-media, and multi-
dimensional geographic information in a distributed computing
environment.
For creating Digital Earth and NSDI, it is critical to integrating
multiple huge databases. To meet various types of users, the
GIS software should be customizable and of flexible
architecture. From the experiences of creating Digital Shenzhen,
SDI of Guangdong province and the country level SDI of China,
GeoStar, a domestic enterprise version of GIS platform,
provides a feasible solution as the GIS software for creating
SDI of China at various levels.
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