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Open GIS with Spatial and Temporal Retrievals as well as
Data AssimilationsKohei Arai
Saga University
Asia-Pacific Advanced Network2003 Conference in FukuokaSRP Center(Momochi Cube)On 21 Jan.2003
Objectives
• Space and time search from assimilation data
• Display the retrieved result of animated images on multi web browsers
• Several animated image with the different time intervals should be displayed smoothly
• Prediction with assimilation data should be available
Open GIS,Web.GIS
• Layer– User,Application
• Database– UUDI
• Spatial search
• Representation– XML,G-XML,GML
• Temporal search
• Simulation
• Prediction
Open GIS Consortium(OGC)
• Intranet oriented technology, CORBA, COM
• Service Chaining• FGDC Clearing house
(ISO23950 of distributed retrievals: wizard search
• FGDC CSDGM and ISO19115CD based metadata
• Profiling, interoperability
User InterfacePresentation(Web.Browser)
Business(Application)Local and/or Remote
Data AccessDatabase(raster,vector,attribute)XML,G-XML,GML→Schema
GML(Geographic Markup Language)
○OGC version2.1.1○XML based Geographical data description language○G-XML of DB origin of ML was merged to GML○It contains three schema, feature, geometry and Xlink schema
FeatureGeometry
Xlink
OGC ver.2.1.1 of GML SchemaXML
G-XML(DB)
HTML
G-XML,GML,XML with schema
ISO23950(Z39.50) FGDC was assigned by president in 1994Protocol:Z39.50(JIS-x 0806) based clearing house:GEO
Metadata:ISO 19115Content Standard for Digital Geospatial Metadata
Profile:GEO ver.2.2-ISO 19115CDISO/CD 15046-15:Geographic Information Part-15(Metadata) in 1998
Interoperability:Web.Mapping Test bed IIMerge GML to G-XML
Problems:Visualization of retrieved results(Geological region should be displayed)Relationship between metadata and spatial information(Extend metadata contents and attributes)
Z39.50 is a standard protocol for database search of distributed GIS
Client Query:Date, Location, Layer, Altitude,
ServerMetadata search
FGDC+time tagtime and space domain
Data Access
GML(vector data) to GIF data
Client Retrieved ResultAnimation andsimulations
GIF Animation
Vector to raster
Morphing
GIF animation
SVG animation
Morphing
SVGanimation
SVG(Scalable Vector Graphics)
○ ブラウザ上でベクターデータを表示する言語○XML 形式である○DOM と JavaScript を利用してアニメーションが可能
表示結果
XSLT(XSL Transformation)
○XML 文書の構造変換ルールを記述する言語○ 本研究では GML から SVG への変換で利用
Example of SVG animation
Example of nviz plug-in
Concluding Remarks
• Open GIS→Space and time search
• GML+time tag
• Smooth display of animated retrieved multi result image with morphing
• GML→GIF VS GML→XSLT→SVG
• Simulation and prediction based on wavelet analysis