Open GIS with Spatial and Temporal Retrievals as well as

Data AssimilationsKohei Arai

Saga University

arai@is.saga-u.ac.jp

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