ICEFLOW: short-term movements in the Cryosphere

Bas AltenaDepartment of Geosciences, University of Oslo.

now at: Institute for Marine and Atmospheric research, Utrecht University.

Bas Altena, project Iceflow

geometric properties from optical remote sensing

Bas Altena, project Iceflow

Sentinel-2 Fast flow through icefall

[published] Ensemble matching of repeat satellite images applied to measure fast-changing ice flow,verified with mountain climber trajectories on Khumbu icefall, Mount Everest. Journal of Glaciology.

[outreach] see also ESA Sentinel Online: Copernicus Sentinel-2 monitors glacier icefall, helping climbers ascend Mount Everest

Bas Altena, project Iceflow

Sentinel-2 Fast flow through icefall

glacier surface speed [meter/day]

0.2 0.4 0.6 0.8 1.0 1.2

Western Chm

Khumbu Glacier

Mt. Everest

Nuptse LR

1800 1200 600 0

-300

0

300

righ

tle

ft

terrain slope [deg]

40◦30◦20◦10◦

5/44/4

3/4

4/4

2/4

2/4

interval per 1/4 [meter/day]surface velocity contours

10 2 km

[outreach] see also Adventure Mountain: Mount Everest: The way the Khumbu Icefall flows

Bas Altena, project Iceflow

Sentinel-2 Fast flow through icefall

∆H

H

icefall

internalvelocityprofile

αU = − 2A

3+2 H(tanαρgH ∂H

∂x

)3

Ut=2000

Ut=2020

MSc thesis research at Wageningen University

Bas Altena, project Iceflow

Quantifying precision in velocity products

search spacetemplate/chip correlation surface

zoom in

scoreNCC

557 200 557 600

7 665 600

7 665 800

7 666 000

7 666 200

557 460557 480

557 5007 665 800557 520

00.5

1

557 200 557 600

7 665 600

7 665 800

7 666 000

7 666 200

557 200 557 600

7 665 600

7 665 800

7 666 000

7 666 200

Θ

[submitted] Dispersion estimation of remotely sensed glacier displacements for better error propagation. The Cryosphere.

Bas Altena, project Iceflow

Quantifying precision in velocity products

69.2◦N

49.5◦E 49.0◦E 48.5◦E

69.1◦N

0.100.321.003.1610.031.6

10 km5 km0surface velocity [ m · d-1 ]

streamlines

Radon crevasse orientation

Shear strain rate+1/16

-1/16

0

0◦

180◦

10 kmN

10 km

N0.0

1.0

0.5

[submitted] Dispersion estimation of remotely sensed glacier displacements for better error propagation. The Cryosphere.

Bas Altena, project Iceflow

Monitoring river ice break-up

spatial resolution

1995 2000 2005 2010 2015 20209:00

10:00

11:00

12:00

13:00

14:00Aqua Sentinel-3A

Sentinel-3B

Terra PROBA-V

Landsat 7 EO1CBERS-2

IRS P6

DoveFlock-3P &

Landsat 8

Sentinel-2A

VenµsCBERS-4

coarse (500-100m)medium (100-10m)high (10-3m)

IRS 1C

CBERS-1

SPOT5

3P’

local equatorial crossing time [hh:mm]

Sentinel-2

PROBA-V

upsampling

entropy filter

search space

weights template

10m

100m

redfeature

similarity score

∏

30m

locations

image matching

rawdisplacements

centerline &

mathematicalmorphology

direction

directionalfilter

displacementsfinalpost processing

Global RiverWidths fromLandsat

[outreach] see also ESA Sentinel Online: Copernicus Sentinels observe vast and fast movements in the Arctic

Bas Altena, project Iceflow

Monitoring river ice break-up

500 000

600 000

700 0007 500 000 7 600 000 7 700 000 7 800 000 7 900 000

0 1 2 3

100 km N

ice speed [m/s]

KystatyamZhigansk

Kyusyur

UTM [m]yx

[in review] Noticing river ice movement through a combination of European satellite monitoring services.International Journal of Applied Remote Sensing and Geo-information.

Bas Altena, project Iceflow

Wiley book

bookchapter in

Surface Displacement Measurementby Remote Sensing Imagery

or

Mesure de Deplacement de Surfacepar Imagerie de Teledetection

Glaciology: Studying glaciers dynamics from remote sensing images.

Bas Altena, project Iceflow