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INTERNATIONAL INSTITUTE FOR GEO-INFORMATION SCIENCE AND EARTH OBSERVATION Flood Hazard Assessment: ILWIS Case study. Drs. Nanette C. Kingma.

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Presentation on theme: "INTERNATIONAL INSTITUTE FOR GEO-INFORMATION SCIENCE AND EARTH OBSERVATION Flood Hazard Assessment: ILWIS Case study. Drs. Nanette C. Kingma."— Presentation transcript:

1 INTERNATIONAL INSTITUTE FOR GEO-INFORMATION SCIENCE AND EARTH OBSERVATION Flood Hazard Assessment: ILWIS Case study. Drs. Nanette C. Kingma

2 Generalized physiographic map. From: Geological map of Bangladesh, 1990.

3 Flood map Bangladesh.

4 Extreme flooding: 1988.

5 1987 : Dry Season. (SPOT band 1) SPOT band dry-season

6 1987 : Dry Season. (SPOT band 2) SPOT band dry-season

7 1987 : Dry Season. (SPOT band 3). SPOT band dry-season

8 1987 : Dry Season. SPOT band dry-season SPOT band dry-season SPOT band dry-season

9 1987 : Moderate Flood. (SPOT band 1). SPOT band flood

10 1987 : Moderate Flood. (SPOT band 2). SPOT band flood

11 1987 : Moderate Flood. (SPOT band 3). SPOT band flood

12 Moderate Flood 1987 SPOT band flood SPOT band flood SPOT band flood

13 1988 Severe Flood. (SPOT band 1). SPOT band flood

14 1988 Severe Flood. (SPOT band 2). SPOT band flood

15 1988 Severe Flood. (SPOT band 3). SPOT band flood

16 Severe flood 1988 SPOT band flood SPOT band flood SPOT band flood

17 False Color Composite DRY False color composite: FCCdry87.

18 False Color Composite MFL87 False color composite: FCCmfl87.

19 False Color Composite Severe Flood False color composite: Fccfl88.

20 Overview DRY 87 FL 88 MFL 87

21 Why band ratios Clouds Shadows

22 Band Ratio DRY Brdry87: Band ratio: band3/band1 dry-87.

23 Band Ratio Moderate Flood 1987 Brmfl87: Band ratio: band3/band1 mfl-87.

24 Band Ratio Severe Flood 1988 Brfl88: Band ratio: band3/band1 flood-88.

25 Slicing of Brdry87 into land and water. Dry87wl: Slicing into water and land of band ratio 3/1 dry 87.

26 Slicing of Brmfl87 into land and water. Slicing into water and land of band- ratio 3/1 mfl-87.

27 Slicing of Brfl88 into land and water. Fl88wl: Slicing into water and land of band- ratio 3/1 flood88.

28 Cross operation result: dry87wl and mfl87wl. Cross dry87wl and mfl87wl output map Dryfl.

29 Crossing of: DryFl with fl88wl. Final result map Crossing of: dry87wl, mfl87wl, and fl88wl.

30 Bangladesh: Confluence Ganges - Meghna. Cross table: maps drywl-mfl87wl Cross table:final map drymflcr - fl88wl.

31 Bangladesh: Confluence Ganges - Meghna. Final result map crossing of: dry87wl, mfl87wl, and fl88wl; with legend.

32 Map Layout.


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