By: Jumadi

Presentation Outline

Introduction Problems Objectives Research Area System Development Processes Mapping Environment Database Development Decision Making Processes Case Study Conclusions

Introduction The eruption of Merapi Volcano in 2010

released ± 130 milion3 material (Magelang

Local Government and UN-OCHA, 2011). The material was deposited on the upslope

of Merapi. During rainy sesion of 2011 about 1/3

(BPPTK , 2011) of the material caused damaging of numbers of setlements, bridges, roads and agricultural lands.

The rest is predicted will be potential threath during rainy season until 4 year (BPPTK , 2011).

Problems

Several institution in 4 municipality and 2 province involved to manage the disaster in collaborative work.

Spatial information is needed to support decision making proceses.

Unfortunately, in some cases each institution has different priority and prefference.

At the same time, it is lack of spatial data sharing among institution.

Proposed Solution

Widely accesible spatial information system (Web-based)

Support democratic decision making. Fullfil users requirements from various

institution with different administrative area.

Objective

To develop prototype of web-based spatial information system for collaborative lahars disaster management.

Reserach Area

Merapi

Nr District Area of Damaged Road (m2)

1 Cangkringan 202,500.00

2 Donokerto 1,535.00 3 Ngemplak 2,100.00

4 Pakem 137,129.00 5 Tempel 106,400.00

6 Turi 89,929.00 7 Wonokerto 160.00

Grand Total 539,753.00

Nr District Number of Damaged Bridges

1 Cangkringan 32 Ngalik 2

3 Pakem 34 Turi 1

Grand Total 9

Source: BBWS Serayu Opak, 2011

Infrastructure damages from the previous lahars events

Example of Lahars Disaster Events in 2011

Source: www.antaranews.com Source: http://wwwabbee-keren.blogspot.com/

Development Processes Spatial Multi-

criteria Decision Analysis is used

Mapping Environment

Hexagonal grid as surface model of the area was created.

The spatial data is stored into geometry field in PostgreSQL/PostGIS.

Infrastructures Data

Infrastructures is stored using different geographic model.

Nr Object Geographic

Model

1 Road network line

2 Irigation Network line

3 Building polygon

4 Bridges point

Storing the Criterion Map

Weighting method and Decision Rule

Rating Method (Malczewski, 1999) for the criterion weighting based on the users’ preferences.

Simple Additive Weighting Method

(Malczewski, 1999). The model was implemented in the

spatial query analysis in PostGIS.

Single User Decision Making Procedure

Collaborative Decision Making

User Preference Input

User Preference Input

User Preference Input

Statistical Analysis

Running The Decision Rule

Result

Case StudyTemporary housing site selection

Criteria Map Used:

•Slope Map •Landuse Map •Proximity to Population

•Proximity to local road network •Constraint 1 (hazard Map) •Constraint 2 (conservation Map)

Criteria Weigting Input

•Normalized weighting result.

•User Preference Input of the Criterion Importance Level

•Statistical Analysis of the decision result.

Example of The Result

Making the Result Interoperable using Web Feature Service (WFS)http://localhost:91/lahars-sdss/wfs/index.php?

CA=0.359712230216_0.280575539568_0.169064748201_0.190647482014&C1=0.328719723183_0.256055363322_0.200692041522_0.141868512111_0.0726643598616_0&C2=0.292418772563_0.0938628158845_0.223826714801_0.162454873646_0_0.227436823105&C3=0.699300699301_0.300699300699_0&C4=0.694444444444_0.305555555556_0&CT=0.328719723183_0.256055363322_0.200692041522_0.141868512111_0.0726643598616_0

•WFS link generation

•WFS link

•Accessing the WFS link using Quantum GIS

Conclusions

Spatial data is important on collaborative disaster management, mainly in data communication and decision making processes.

Collaborative decision making through spatial information involve various users with various understanding and skill GIS, so that, the application interface should be as simple as possible.

Data sharing is important.

Thank You

This paper was writen based on MSc ResearchDouble Degree MSc Programme

Geoinformation for Spatial Planning and Risk Management ITC, Univ. Of Twente, The Netherlands - UGM