Z-Earth Global dynamic topography at very-high resolution for Geohazards, Climate Change and Vulnerability mapping
Thomas Dewez (PI of Z-Earth consortium)
[email protected] Proposal to ESA’s Earth Explorer 8 call supported by CNES and Astrium
SPIRIT workshop, LEGOS, Toulouse 29 – 30 April 2010
Z-Earth mission concept for 2018
> Refine global topography to field scales (2m) > Several times during the mission life-time > Monitor seasonnal 3D topography dynamics > Instrument • • •
Combination of active and passive sensors LiDAR profilers (2 eye-safe NIR wavelengths) Imagers (Pan + RGBNIR)
> Products • • •
Digital Surface Models (2m pixels, 50cm vertical accuracy) Pan-sharpened colour orthophotos Full-waveform profiles (at 1.06 and 1.5 µm)
> Project supported by CNES and Astrium >2
Scientific themes
> 4 super-themes covering complementary scientific disciplines
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Partnership
> Climate change (7) •
Canada, Iceland, Norway, France, Germany, The Netherlands, Belgium
> Geohazards (7) •
UK, US, Germany, Spain, Italy, France, Greece
> Vulnerability (2) •
Spain, France
> Image processing (2) •
Canada, Belgium
> 11 countries (9 ESA members) >4
Mission time scales
> 5 years mission from 2018 • •
6 to 7 revisit during mission lifespan Limited by LiDAR diodes and fuel consumption
> Monitor seasonnal topographic changes • •
9 months revisit time Delay imposed by vertical precision criterion
> Daily topographic changes •
7 days between adjacent swaths
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Glaciology aspects
> LiDAR designed for glaciological applications
• •
2 tracks LiDAR 1.06 µm and 1.5µm Spots
– 12m - 100m @ 1.06µm – 5m – 1km @ 1.5µm > DSM optimized
•
20m pixel DSM to improve vertical accuracy
> Flow field •
Velocity down to 6cm/7years Aster spectral Library: JHU measurements
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Conclusion: Z-Earth concept strength and weaknesses
> Strengths • • • • • •
Combination of active and passive sensors Global coverage (includes countries which cannot invest in airborne LiDAR coverages) DSM resolution (2m) Local Bare Earth models Vertical accuracy (0.5m) Repeat passes (every 9 months)
> Weakness •
Airborne and terrestrial LiDAR do better
– But not all the time, nor everywhere
•
Optical system impeded by clouds
– Orbits minimize cloud potential (local time + dt between adjacent orbits)
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Wanna be in?
> Join Z-Earth partnership •
Contact:
[email protected]
> We need •
image correlation specialists
> Want more technical details? • •
Today: sign Astrium’s NDA Next week: the patent should be registered, we could talk freely!
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Current partnership
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