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Flood modelling and management
Glasgow University
September 8 2004
Paul Shaw - GeoVision
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Remote sensing for environmental impact and monitoring
Video
Hydrographic LIDAR
Hyper-spectral sensing
INSAR from space
3d visualisation
www.geovision.co.uk Global Solutions
Remote sensing for environmental impact and monitoring
Video
Hydrographic LIDAR
Hyper-spectral sensing
INSAR
3d visualisation
www.geovision.co.uk Global Solutions
Video
• Digital video taken from helicopter• Each video frame aligned with a GPS position• Background map and video integrated into GIS• GIS functionality allows extra inputs and database
interrogation• Uses include environmental monitoring and impactThe following examples are from a software called GeoFilm
developed by RSK Orbital - Link
www.geovision.co.uk Global Solutions
Remote sensing for environmental impact and monitoring
Video
LIDAR – Light Detection and Ranging
Hyper-spectral sensing
INSAR
3d visualisation
www.geovision.co.uk Global Solutions
Hydrographic LIDAR
• Uses Blue/Green part of the EM spectrum to penetrate water
• Operates up to 60m depth in clear water• Survey up to 30 sq km in 1 hour• Horizontal accuracy – 3m, vertical accuracy 0.15m• 4m maximum grid Examples of Optech ‘Shoals’ system at Link
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LIDAR – Other uses• Natural resource management • Chemical and biological detection and analysis • Wind field profiling• Atmospheric aerosols and cloud studies • Ozone depletion, climate change, global transport
of pollutants • Urban pollution, dust transport • Polar cloud monitoring Examples at Link
www.geovision.co.uk Global Solutions
Remote sensing for environmental impact and monitoring
Video
LIDAR – Light Detection and Ranging
Hyper-spectral sensing
INSAR
3d visualisation
www.geovision.co.uk Global Solutions
Hyper-Spectral Sensors
CASI - Compact Airborne Spectrographic Imager• Pushbroom scanner• Measures up to 288 wavebands simultaneously in
the visible and near infrared regions• Can identify specific vegetation, minerals or rock
because each has a unique absorption characteristic in a defined wavelength
• Resolution up to 1m• Examples at Link and link• New research into satellite sensors – Link
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Modern Remote Sensing Technologies
Video
LIDAR – Light Detection and Ranging
Hyper-spectral sensing
INSAR
3d visualisation
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INSAR – Interferometric SAR
• ERS, Radarsat or ENVISAT available satellites• Measure phase difference from ‘before and after’ • Millimetre accuracy from space• Applications include earthquakes, subsidence,
landslips, dam movement
Phase changes
original groundposition displaced ground
position
satellite position at
first acquisition
satellite position at second acquisition
Different signal pathlengths means difference
in signal phase
Slide courtesy of NPA associates, UK
Stoke-on-Trent – displacement between 18-Oct-93 & 28-Feb-96 (Picture courtesy NPA Group)
www.geovision.co.uk Global Solutions
Remote sensing for environmental impact and monitoring
Video
LIDAR – Light Detection and Ranging
Hyper-spectral sensing
INSAR
3d visualisation
www.geovision.co.uk Global Solutions
3 Dimensional Visualisation
• Ortho-rectified imagery can be combined with design information to create 3 dimensional virtual reality
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Link to video
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Summary
• Over the last 10 years LIDAR, CASI, SAR, high resolution satellite imagery and RTK GPS have been introduced.
• These technologies have been adapted and integrated with other technologies like video to solve many geospatial information issues.
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.......................and the next 10 years?
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Questions?