SPIRIT DEM applications over Svalbard
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1 SPIRIT DEM applications over Svalbard Chris Nuth 1, Geir Moholdt 1, Nora Schneevoigt 1, Monica Sund 2,1, Mari Svanem 3, Anne Chapuis 3, Wiley Bogren 4,1, Andreas Kääb 1 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: kaeaeb@geo.uio.no
2 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 2
3 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 GUIO NO-Oslo Uni 3 topography A. Shepherd SGUE UK-Edinburgh Uni 4 elevation change T. Strozzi Gamma CH-Berne Industry 5 velocity 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
4 GlobGlacier products Outlines: 2D vector data from ms sensors (band ratio with manual corrections), three levels, total: (size) Level 0: corrected outlines, L1: individual glaciers, L2: L1 & topography Terminus: ms sensors (automated), intersection of central flow line / lowest point, total: (length change) Snow line: snow covered area from ms & microwave, end of ablation period, elevation from DEM, total: (ELA) Topography: from archives (SRTM), stereo sensors (SPOT, ASTER) or interferometry (ERS1/2), total: (inventory) Elevation change: from DEM differencing and altimetry, extrapolation to entire glacier, total: (mass balance) Velocity: feature tracking (repeat pass ms), DInSAR & offset tracking (microwave), total: 200 (mass balance, drainage)
5 GlobGlacier target regions GLIMS database
6 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 6
7 Geolocation accuracy / co-registration (C. Nuth) h s xy cos( Az s ) tan s z h tan a cos( b ) c 7
8 Geolocation accuracy / co-registration (C. Nuth) SPIRIT - NPI Nuth and Kääb, in prep. 8
9 Geolocation accuracy / co-registration (C. Nuth) c a Solve using a robust approach in a least squares manner b a = 15 b = 3.16 ~ 180 deg c = r 2 = 0.88 Nuth and Kääb, in prep. 9
10 Geolocation accuracy / co-registration (C. Nuth) SPIRIT - NPI Nuth and Kääb, in prep. 10
11 Geolocation accuracy / co-registration (C. Nuth) SPIRIT - NPI Nuth and Kääb, in prep. 11
12 Geolocation accuracy / co-registration (C. Nuth) RMS decreased by 30%! From 9 to 6 meters Nuth and Kääb, in prep. 12
13 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. 13
14 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 14
15 DEM differencing / elevation changes 15
16 DEM differencing / elevation changes (C. Nuth) 16
![2007-2008 [m] Sund et al.](/docs-images/92/109315415/images/17-3.jpg ", 2009 Base data: Sund and")
17 DEM differencing / elevation changes (M. Sund) Comfortlessbreen Elevation changes [m] Sund et al., 2009 Base data: Sund and Eiken, 2010 SPOT DTM Sund et al., in prep. NPI 2008 Aerial images 17
18 DEM differencing / elevation changes (M. Sund) Elevation change in metres Base data: NPI 1990 DTM ASTER SPOT DTM Sund et al., 2009 Sund and Eiken, 2010 Sund et al., in prep. Background: SPOT Zawadzkibreen 18
19 2008 Nathorstbreen Photo: F. Mehlum 2009 Photo: O. Einang 19
20 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 20
21 Slope correction for altimetry (G. Moholdt) Moholdt et al., subm. 21
22 Slope correction for altimetry (G. Moholdt) Moholdt et al., subm. 22
23 Slope correction for altimetry (G. Moholdt) Moholdt et al., subm. 23
24 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 24
25 InSAR topographic phase (N. Schneevoigt, W. Bogren) 25
26 InSAR topographic phase (N. Schneevoigt, W. Bogren) 26
27 InSAR topographic phase (N. Schneevoigt, W. Bogren) 27
28 InSAR topographic phase (N. Schneevoigt, W. Bogren) 28
29 InSAR topographic phase (N. Schneevoigt, W. Bogren) 29
30 InSAR topographic phase (N. Schneevoigt, W. Bogren) Schneevoigt et al., in prep. 30
31 InSAR topographic phase (N. Schneevoigt, W. Bogren) Schneevoigt et al., in prep. 31
32 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 32
33 Orthoprojection (M. Svanem, A. Chapuis, M. Sund, C. Nuth) 33
34 Orthoprojection (M. Svanem, A. Chapuis, M. Sund, C. Nuth) 34
35 Orthoprojection (M. Svanem, A. Chapuis, M. Sund, C. Nuth) 35
36 Orthoprojection (M. Svanem, A. Chapuis, M. Sund, C. Nuth) 36
37 Orthoprojection (M. Svanem, A. Chapuis, M. Sund, C. Nuth) 37
38 Orthoprojection 38
39 Orthoprojection (M. Svanem, A. Chapuis, M. Sund, C. Nuth) 39
40 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 40
41 Glacier outlines (C. Nuth) 41
42 Glacier outlines (C. Nuth) Orange: old data ( ) Green: 1990 data available Blue: Spirit data available 42
43 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 43
44 Displacement between repeat SPOT /
45 Displacement between repeat SPOT /
46 Displacement between repeat SPOT / max. 45 m (1 m d -1 ) 300m 46
47 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 47
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