an experiment on spatial data exchange october 24, 2001 murao, yoshiaki (ibm japan) email:...

An Experiment on

Spatial Data Exchange

October 24, 2001

MURAO, Yoshiaki(IBM Japan)

Email: [email protected]

ISO/TC211 Workshop on Standards in Action

SAIJO, Yuuki(Geographical Survey Institute)

Email: [email protected]

An Experiment on Spatial Data Exchange in Japan

2

Content

• Structure and Schedule

• Experiment phase II

• Experiment phase III

• Considerations

• Demonstoration


3

Structure for ISO 19100 series in Japan

ISO/TC211

ISO/TC211 Domestic Committee

Japanese National Standards

for Geographic Information

(NSGI) Committee

Japan side

with 5 WGs


4

Activity in Committee of National Standards for Geographic Information

Developmentdevelop NSGI as

conformed to ISO 19100 series

(mainly focused on exchange, in current)

Support applicationsspecify methodologies to apply NSGI

to practical operations

Experimentson Spatial Data Produces / Exchanges


5

Schedule of Spatial Data ExperimentsFY 1999

Spatial Data Exchange Experiment I

•　 Convert existing spatial data to standard specification data sets

•　 Load standardized data set into existing GIS

FY 2000

FY 2001

Spatial Data Exchange Experiment III (will end on March 2002)

• Dynamic recognition of the content of Application Schema

• Implementation of Portrayal Catalog / Specification

Spatial Data Exchange Experiment II• Merge multiple standardized data sets in existing GIS• Exchange update information• XML documentation for Application Schema


6

Results of

Spatial Data Exchange Experiment II


7

Dataset and file sizes( Experiment II )

File ID Original Data 19100 Conformed Data Ratio

513242

533606

533607

533616

533617

544001

564033

1,176 KB

3,002 KB

1,966 KB

2,056 KB

1,651 KB

1,266 KB

1,122 KB

7,364 KB

19,790 KB

13,111 KB

13,316 KB

10,752 KB

8,157 KB

6,584 KB

6.26

6.59

6.66

6.48

6.51

6.44

5.87

(Original Data are in CSV style.)

Impact of large file size:

- Hard to transfer files

- Process time of XML parsing

- Memory shortage in DOM process

Actions to reduce file size:

- Simplify Application Schema

- Assign short tag names

- Use ATTLIST if possible


8

Exchanging “Update Data”

GIS - A

Base Map(XML)

Update operation

GIS - BUpdate Data

(XML)

Added

Deleted

Modified

Get Update Information

( Experiment II )Conformed to 19107, 19108, 19109 and 19118


9

Defining “Application Schema Description File”

Application Schema Description File

Class definitions by UML <Class_A>

<Data1> …… </Data1>

<Data2> …… </Data2>

</Class_A>

Class_A

DataType 1 DataType 2

<Class name=“HighwayNode” tag="HighwayNode“ abstract="NO" stereotype="Feature">

<Property name=“BoundaryType” tag="meshuKyokai" datatype="Boolean" multiplicity="1" value="false"/>

<Composition name=“Point” tag="pt“ targetClass="GM_Point" stereotype="geometry" multiplicity="1“ />

<Composition name=“Period” tag="pd“ targetClass="TM_Period“ stereotype="temporal" multiplicity="0..1“ />

Instantiation of classes by XMLGeneral

EncodingRule

HighwayNode

GM_Point TP_Node

Class

Property Composition

Application Schema by UML

MetaClass definitions by UML

Instantiation of MetaClasses by XML= Definition of Application Schema by XML

GeneralEncoding

Rule

Data2Data1

Instances of any UML class diagrams can be encoded with XML.


10

Characteristics of “Application Schema Description File”

All contents of UML class diagrams are described in “Application S

chema Description File” as an XML document.

Contents of “configuration table” for Encoding are also included.

Both of machine and human readable.

Independent from commercial UML tools.

Information of Application Schema can be stored and interchange

d.

( Experiment II )


11

Overview of on-going

Spatial Data Exchange Experiment III


12

Highlights

Base Map + Thematic data (Point data) overlay

Dynamic recognition of Application Schema

Implementation of Portrayal Catalogs / Specifications

( Experiment III )


13

Functional Overview

GIS ( 6 different systems )

Base Map(XML)

Application Schema of

Thematic Data(XML)

( Experiment III )Conformed to 19107, 19108, 19109 and 19118

Thematic Spatial Data

(XML)

Portrayal Catalogs and Portrayal Specificat

ions

(XML)

Load Standardized format file of Base Map data.

Application Schema of Base Map is statically defined in GIS-A.

Load Application Schema Description File of thematic data, and recognize new classes and their attributes dynamically.

According to the recognition of Application Schema, load Thematic Data and overlay them on Base Map.

Load Portrayal Catalogs / Portrayal Specifications, and change the way to draw each features.

Based on 19117

(1)

(2)

(3)

(4)


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Schedule and Current Phase( Experiment III )

Aug Sep Oct Nov Dec Jan Feb

External Design Detail Design /

Development

Test

Documentation

External Design has been completed.

Now


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Considerations


16

Considerations around Application Schema

Differences between spatial attribute and thematic attributes.

( Experiment I ~ III )

Open standard format file for Application Schema descriptions.

〒ABC Post

Office

PostOffice+name : CharacterString

+symbol_pos : GM_Point+name_pos : GM_Point

≪Feature≫

+shape : GM_Surface

Essential spatial Attr. for the feature

Thematic spatial Attr. to draw additional data

No wayto distinguisheach other.

An alternative:=> Add stereotypes at the top of attribte statement to identify “spatial” or “thematic”


17

Considerations around Encoding

File size problem with XML

Rule for general UML class diagrams.

Exchange Configuration table

( Experiment I ~ III )


18

Demonstrations


19

Thank you

an experiment on spatial data exchange october 24, 2001 murao, yoshiaki (ibm japan) email:...

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