rahul bajpai m.tech remote sensing & gis rsacup

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APPLICATION OF RADAR REMOTE SENSING IN FLOOD MANAGEMENT BY:RAHUL BAJPAI

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Page 1: Rahul Bajpai M.tech Remote sensing & GIS RSACUP

APPLICATION OF RADAR REMOTE SENSING IN FLOOD MANAGEMENT

BY:RAHUL BAJPAI

Page 2: Rahul Bajpai M.tech Remote sensing & GIS RSACUP

TOPICS

•INTRODUCTION TO RADAR REMOTE SENSING

•INTRODUCTION TO FLOOD MANAGEMENT

•USE OF RADAR IN FLOOD MANAGEMENT

•INTEGRATION OF GROUND BASED AND

SATELLITE RADAR DATA

•DIGITAL ELEVATION MODEL

•FLOOD MANAGEMENT MAP

Page 3: Rahul Bajpai M.tech Remote sensing & GIS RSACUP

RADAR REMOTE SENSING

RADAR stands for "Radio Detection And Ranging". By virtue of sending out pulses of microwave electromagnetic radiation this type of instrument can be classified as an "active sensor" - it measures the time between pulses and their reflected components to determine distance.

radar only shows the difference in the surface roughness and geometry and moisture content of the ground (the complex dielectric constant). Radar and infrared sensors are complimentary instruments and are often used together to study the same types of earth surfaces.Radar systems may or may not produce images

Page 4: Rahul Bajpai M.tech Remote sensing & GIS RSACUP

•Near real time flood monitoring•To assess the nature of floods e.g. magnitude, type,  recurrence intervals, etc•Mapping of flood prone areas•Assessment of risk to the bio-physical, socio-economic and service ,infrastructural elements•Assessment of vulnerability and disaster 

Though floods cannot be stopped ,its damages can be minimized by proper management measures. Flood disaster management demands efficient planning measures, implementation and policy making decisions , application of modern scientific and communications tools for smooth functioning

FLOOD MANAGEMENT

Page 5: Rahul Bajpai M.tech Remote sensing & GIS RSACUP

The Flood Forecasting involves the following four main activities :-

(i) Observation and collection of hydrological and hydro-meteorological data (ii) Transmission of Data to Forecasting Centres(iii) Analysis of data and formulation of forecast iv) Dissemination of forecast.

FLOOD FORECASTING SYSTEM

AwarenessSub-Systems

Risk Assessments

Satellite data

ForecastingSub-Systems

Rainfall Prediction

WarningSub-Systems

Secure Communications

Broadcast Media

ActionSub-Systems

Evacuation

Insurance Flash Flood Prediction

Person-to-person Emergency

Reinforcement

IT Infrastructure

Debris Flow Prediction etc

Ground based radar system

Resettlement

etc

(see Chapter 6) (see Chapter 7)

Page 6: Rahul Bajpai M.tech Remote sensing & GIS RSACUP
Page 7: Rahul Bajpai M.tech Remote sensing & GIS RSACUP

WHY?LIDAR RADAR

Page 8: Rahul Bajpai M.tech Remote sensing & GIS RSACUP

TypesDEM : Digital Elevation ModelDSM : Digital Surface Model

Elevation Data

SourcesUSGS DEM, NED, DTED, ETOPO30, SRTMInterpolated from points and linesGenerated photogrammetricallyLiDAR

Page 9: Rahul Bajpai M.tech Remote sensing & GIS RSACUP

DEM

FLOW DIRECTION

SINK

FILL

FLOWLENGTH

FLOW ACCUMULATION

WATERSHED

SNAP POUR

Depression lessDEMAre there any sinks?

No

Yes

STREAM LINE

STREAM ORDER

STREAM LINKApp

ly T

hres

hold

Function Processing

Page 10: Rahul Bajpai M.tech Remote sensing & GIS RSACUP

Determine aspects of terrain Slope, aspect, spot elevations Source for contour lines

Finding terrain features Watersheds, drainage networks, stream channels

Modeling of hydrologic functions

Uses of DEMs

Slope

Watersheds

Mean Slope per Watershed

Page 11: Rahul Bajpai M.tech Remote sensing & GIS RSACUP

SRTM DATA DERIVED DEM

Page 12: Rahul Bajpai M.tech Remote sensing & GIS RSACUP

COLOR PHOTOGRPH RADAR IMAGE

Page 13: Rahul Bajpai M.tech Remote sensing & GIS RSACUP

FLOOD MAP

•Several studies indicated that SAR can be used to delineate flood boundaries even when they are obscured by forest or other vegetation,

Page 14: Rahul Bajpai M.tech Remote sensing & GIS RSACUP

THANK YOU