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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 1 1987 dry-season

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

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

8 1987 : Dry Season. SPOT band 1 1987 dry-season SPOT band 3 1987 dry-season SPOT band 2 1987 dry-season

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

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

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

12 Moderate Flood 1987 SPOT band 1 1987 flood SPOT band 2 1987 flood SPOT band 3 1987 flood

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

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

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

16 Severe flood 1988 SPOT band 1 1988 flood SPOT band 2 1988 flood SPOT band 3 1988 flood

17 False Color Composite DRY 1987. False color composite: FCCdry87.

18 False Color Composite MFL87 False color composite: FCCmfl87.

19 False Color Composite Severe Flood 1988. False color composite: Fccfl88.

20 Overview DRY 87 FL 88 MFL 87

21 Why band ratios Clouds Shadows

22 Band Ratio DRY 1987. 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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