WP6 Demonstrators

Estimating inundation extent from a distance

May 2014

Paul Brewer

Barry Evans

Crona Hodges

Mark Macklin

Richard Williams

Overview

• User interface design

– Navigating interface

– Drawing on photos

• Calculating inundation extents

– Location at a distance

– Uncertainties

– Fuzzy inundation

• Next steps

User interface design

• Simple to use in field

• Encourages capture of useful data

• Data capture divided up into actions

User interface design

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User interface design

• Additional interaction

• Guided steps

Calculating Flood extent

x

• User position

• Estimated height

• Orientation

• Angle of device

• Terrain

Uncertainties

Device:

• GPS Accuracy

• Height of device

• Orientation (Compass bearing)

• Angle of tilt

• Generalisation of Terrain

User:

• Placement of marker

• Accuracy of “swipe line”

Capture information from device & metadata

Reduce uncertainty via multiple photos

Uncertainties

Graph of distance vs. error (Meek et al., 2013)

Uncertainties

x

One unique location for X becomes an area that depicts the likely locations for X based on uncertainties during capture.

Inundation calculation

• Derive inundation extent from user values

• Multiple possibilities due to uncertainties

• Derived likelihood of inundation based on user data

Next steps

• Field test

– Data collection

– App usability

– GPS Accuracy

• Development

– Derive geo-fences for Quality Control

– Automate inundation extent calculation

– Flood modelling

– Boulder Berms with Lichenometry assessment for deriving historical flood record