Remote Sensing For Environmental Impact And Monitoring

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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

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Remote sensing for environmental impact and monitoring

Video

LIDAR – Light Detection and Ranging

Hyper-spectral sensing

INSAR

3d visualisation

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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

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Remote sensing for environmental impact and monitoring

Video

LIDAR – Light Detection and Ranging

Hyper-spectral sensing

INSAR

3d visualisation

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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)

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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?