wp6 demonstrators estimating inundation extent from a distance - brewar, evans, hodges, macklin,...
DESCRIPTION
Brewar, P., Evans, B., Hodges, C., Macklin, M. and Williams, R. 2014. WP6 Demonstrators Estimating inundation extent from a distance. Presentation as part of the COBWEB Workshop, 22nd May 2014, y Plas, Dyfi, UK.TRANSCRIPT
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
1 32
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