SPIRIT DEM applications over Svalbard Chris Nuth1, Geir Moholdt1, Nora Schneevoigt1, Monica Sund2,1, Mari Svanem3, Anne Chapuis3, Wiley Bogren4,1, Andreas Kääb1 1
Department of Geosciences, University of Oslo (UiO) 2 University Centre in Svalbard (UNIS) 3 Norwegian University of Life Sciences, Ås (UMB) 4 Norwegian Institute for Air Research, Kjeller (NILU) Contact:
[email protected]
Content
Preface: • ESA DUE GlobGlacier SPOT 5 SPIRIT DEMs and Orthophotos: • Geolocation accuracy; co-registration • DEM differencing, glacier elevation changes
• Slope correction for satellite altimetry (ICESat) • Topographic phase for 2-pass InSAR • Orthoprojection of automatic camera data • Glacier outline mapping • Displacement measurement A. Kääb
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GlobGlacier consortium & user group Name
Comp.
Country-City
Role
WP
Product
F. Paul
GIUZ
CH-Zurich
Uni
1
outline, terminus
H. Rott
Enveo
AU-Innsbruck
Industry
2
snow line
A. Kääb
GUIO
NO-Oslo
Uni
3
topography
A. Shepherd SGUE
UK-Edinburgh
Uni
4
elevation change
T. Strozzi
CH-Berne
Industry
5
velocity
Gamma
Name
Role
Land
Affil.
Name
Role
Land
Affil.
M. Zemp
WGMS
CH
GIUZ
J. Oerlemans
cryo-mod.
NL
IMAU
B. Raup
GLIMS
USA
NSIDC
R. Braithwaite
slr-mod.
UK
SED
R. Wheate
WC2N
CA
UNBC
L. Andreassen
hydro-m.
NO
NVE
M. Citterio
Greenl.
DK
GEUS
T. Khromova
Russia
RU
RAS
S. Kotlarski
Climate
DE
MPI
P. Mool
Himalaya
NP
ICIMOD A. Kääb
GlobGlacier products • Outlines: 2D vector data from ms sensors (band ratio with manual corrections), three levels, total: 20’000 (size) – Level 0: corrected outlines, L1: individual glaciers, L2: L1 & topography
• Terminus: ms sensors (automated), intersection of central flow line / lowest point, total: 20’000 (length change) • Snow line: snow covered area from ms & microwave, end of ablation period, elevation from DEM, total: 5’000 (ELA) • Topography: from archives (SRTM), stereo sensors (SPOT, ASTER) or interferometry (ERS1/2), total: 5’000 (inventory) • Elevation change: from DEM differencing and altimetry, extrapolation to entire glacier, total: 1’000 (mass balance) • Velocity: feature tracking (repeat pass ms), DInSAR & offset tracking (microwave), total: 200 (mass balance, drainage)
http://www.globglacier.ch/
A. Kääb
GlobGlacier target regions
GLIMS database
A. Kääb
Content
Preface: • ESA DUE GlobGlacier SPOT 5 SPIRIT DEMs and Orthophotos: • Geolocation accuracy; co-registration • DEM differencing, glacier elevation changes
• Slope correction for satellite altimetry (ICESat) • Topographic phase for 2-pass InSAR • Orthoprojection of automatic camera data • Glacier outline mapping • Displacement measurement A. Kääb
6
Geolocation accuracy / co-registration (C. Nuth)
h sxy cos( Azs ) tan sz h a cos( b ) c tan A. Kääb
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Geolocation accuracy / co-registration (C. Nuth)
SPIRIT - NPI
Nuth and Kääb, in prep.
A. Kääb
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Geolocation accuracy / co-registration (C. Nuth)
a
c
b Solve using a robust approach in a least squares manner
a = 15 b = 3.16 ~ 180 deg c = 10.86 r 2 = 0.88
Nuth and Kääb, in prep.
A. Kääb
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Geolocation accuracy / co-registration (C. Nuth)
SPIRIT - NPI
Nuth and Kääb, in prep.
A. Kääb
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Geolocation accuracy / co-registration (C. Nuth)
SPIRIT - NPI
Nuth and Kääb, in prep.
A. Kääb
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Geolocation accuracy / co-registration (C. Nuth)
RMS decreased by 30%! From 9 to 6 meters
Nuth and Kääb, in prep.
A. Kääb
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Geolocation accuracy / co-registration (C. Nuth)
RMS decreased by 30%! From 9 to 6 meters • • • • •
Requires only simple statistics software Works on raster and point data Few iterations (1-2) DEM RMS as direct output Only 3D-shifts
Nuth and Kääb, in prep. A. Kääb
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Content
Preface: • ESA DUE GlobGlacier SPOT 5 SPIRIT DEMs and Orthophotos: • Geolocation accuracy; co-registration • DEM differencing, glacier elevation changes
• Slope correction for satellite altimetry (ICESat) • Topographic phase for 2-pass InSAR • Orthoprojection of automatic camera data • Glacier outline mapping • Displacement measurement A. Kääb
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DEM differencing / elevation changes
A. Kääb
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DEM differencing / elevation changes (C. Nuth)
A. Kääb
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DEM differencing / elevation changes (M. Sund)
Comfortlessbreen Elevation changes 2007-2008 [m] Sund et al., 2009
Base data:
Sund and Eiken, 2010
SPOT-5 2007 DTM
Sund et al., in prep.
NPI 2008 Aerial images
A. Kääb
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DEM differencing / elevation changes (M. Sund)
1990 - 2008 8595000
Elevation change in metres
8590000
8585000
Base data:
8580000
NPI 1990 DTM ASTER 2003 8575000
SPOT5 2008 DTM
514000 516000 518000 520000 522000 524000 526000 528000 530000
Sund et al., 2009 Sund and Eiken, 2010 Sund et al., in prep.
Background: SPOT
Zawadzkibreen
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2008 Nathorstbreen
Photo: F. Mehlum
2009
Photo: O. Einang
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Content
Preface: • ESA DUE GlobGlacier SPOT 5 SPIRIT DEMs and Orthophotos: • Geolocation accuracy; co-registration • DEM differencing, glacier elevation changes
• Slope correction for satellite altimetry (ICESat) • Topographic phase for 2-pass InSAR • Orthoprojection of automatic camera data • Glacier outline mapping • Displacement measurement A. Kääb
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Slope correction for altimetry (G. Moholdt)
Moholdt et al., subm.
A. Kääb
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Slope correction for altimetry (G. Moholdt)
Moholdt et al., subm.
A. Kääb
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Slope correction for altimetry (G. Moholdt)
Moholdt et al., subm.
A. Kääb
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Content
Preface: • ESA DUE GlobGlacier SPOT 5 SPIRIT DEMs and Orthophotos: • Geolocation accuracy; co-registration • DEM differencing, glacier elevation changes
• Slope correction for satellite altimetry (ICESat) • Topographic phase for 2-pass InSAR • Orthoprojection of automatic camera data • Glacier outline mapping • Displacement measurement A. Kääb
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InSAR topographic phase (N. Schneevoigt, W. Bogren)
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InSAR topographic phase (N. Schneevoigt, W. Bogren)
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InSAR topographic phase (N. Schneevoigt, W. Bogren)
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InSAR topographic phase (N. Schneevoigt, W. Bogren)
A. Kääb
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InSAR topographic phase (N. Schneevoigt, W. Bogren)
A. Kääb
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InSAR topographic phase (N. Schneevoigt, W. Bogren)
Schneevoigt et al., in prep.
A. Kääb
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InSAR topographic phase (N. Schneevoigt, W. Bogren)
Schneevoigt et al., in prep.
A. Kääb
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Content
Preface: • ESA DUE GlobGlacier SPOT 5 SPIRIT DEMs and Orthophotos: • Geolocation accuracy; co-registration • DEM differencing, glacier elevation changes
• Slope correction for satellite altimetry (ICESat) • Topographic phase for 2-pass InSAR • Orthoprojection of automatic camera data • Glacier outline mapping • Displacement measurement A. Kääb
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Orthoprojection (M. Svanem, A. Chapuis, M. Sund, C. Nuth)
A. Kääb
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Orthoprojection (M. Svanem, A. Chapuis, M. Sund, C. Nuth)
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Orthoprojection (M. Svanem, A. Chapuis, M. Sund, C. Nuth)
A. Kääb
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Orthoprojection (M. Svanem, A. Chapuis, M. Sund, C. Nuth)
A. Kääb
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Orthoprojection (M. Svanem, A. Chapuis, M. Sund, C. Nuth)
A. Kääb
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Orthoprojection
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Orthoprojection (M. Svanem, A. Chapuis, M. Sund, C. Nuth)
A. Kääb
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Content
Preface: • ESA DUE GlobGlacier SPOT 5 SPIRIT DEMs and Orthophotos: • Geolocation accuracy; co-registration • DEM differencing, glacier elevation changes
• Slope correction for satellite altimetry (ICESat) • Topographic phase for 2-pass InSAR • Orthoprojection of automatic camera data • Glacier outline mapping • Displacement measurement A. Kääb
40
Glacier outlines (C. Nuth)
A. Kääb
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Glacier outlines (C. Nuth)
– Orange: old data (1936-66) – Green: 1990 data available – Blue: Spirit data available A. Kääb
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Content
Preface: • ESA DUE GlobGlacier SPOT 5 SPIRIT DEMs and Orthophotos: • Geolocation accuracy; co-registration • DEM differencing, glacier elevation changes
• Slope correction for satellite altimetry (ICESat) • Topographic phase for 2-pass InSAR • Orthoprojection of automatic camera data • Glacier outline mapping • Displacement measurement A. Kääb
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Displacement between repeat SPOT
2008-06-07 / 2008-07-23
A. Kääb
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Displacement between repeat SPOT
2008-06-07 / 2008-07-23
A. Kääb
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Displacement between repeat SPOT
2008-06-07 / 2008-07-23 max. 45 m (1 m d-1)
300m A. Kääb
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Content
Preface: • ESA DUE GlobGlacier SPOT 5 SPIRIT DEMs and Orthophotos: • Geolocation accuracy; co-registration • DEM differencing, glacier elevation changes
• Slope correction for satellite altimetry (ICESat) • Topographic phase for 2-pass InSAR • Orthoprojection of automatic camera data • Glacier outline mapping • Displacement measurement A. Kääb
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