Proba-V Antarctica Campaign 2017/2018:First Assessment and Optical ImageryE. De GrandisPROBA-V QWG#8 | 6-7 November 2018 | Hamburg, Germany

Outline

• Proba-V Antarctica Campaign 2017/2018

• Data Assessment

• Optical Imagery Analysis

Acquisition and Processing

• Period: November 2017– February 2018

• Acquisition within the calibration segment

• Processing up to L2A products

• Polar Stereographic Projection

• Data made available to the users in the MEP

Ascending Segment (night side): the 2017 Antarctica campaign was acquired using manually programmed calibration segments containing the ascending and descending part and making half of the data (dark side) useless.

Data Assessment - Feedback (I)PROBAV_L2A_20171105_042330_2_333M_V101

Saturation

Data Assessment - Feedback (II)

PROBAV_L2A_20171104_130307_2_100M_V101

Blue channel

Data Assessment - Feedback (III)

WGS84 EPSG:4326 lon/lat

WGS 84 EPSG:3031 Antarctic Polar Stereographic

-not straightforward

use

- need for additional code development

- SNAP Proba-V

not adapted:

pixels not georeferenced,

geometric

operations

not allowed

Polar Stereographic ProjectionPROBAV_L2A_20170623_115604_1_333M_V101

PROBAV_L2A_20171119_041321_2_333M_V101

Data Assessment - Feedback (IV) Cloud and cloud/shadow - cloud mask doesn’t work Land - LSM or SNAP reading LSM?

Pixel Characterization issues

PROBAV_L2A_20171119_041321_2_333M_V101

Decrease in processing efficiency: the L2A segments instead of S1 TOA products

Data Assessment - Feedback (V)

PROBAV_L2A_20170623_115604_1_333M_V101PROBAV_S1_TOA_X17Y03_20170623_333M_V101

Optical Imagery Analysis Approach

VITO Product Distribution PortalProba-V MEP VM: SNAP and Python code

--- Focus on the Antarctica Peninsula ---

Larsen C ice shelf

Larsen C iceberg detachment: final breakthrough announced by project MIDAS on 12 July 2017.

A-68 iceberg calved away from the Larsen C ice shelf, Ice front motion detected on 11 July by Terra Aqua MODIS

Total Larsen C ice shelf area ~46000 Km2

Iceberg A-68A area~5800 Km2 / A-68B area~ 60 Km2

ProbaV Antarctica Campaign started on 24 October 2017

View of the A68 iceberg on the 30 July 2017, taken from a European Copernicus Sentinel-1 satellite image. Photograph: A. Fleming, British Antarctic Survey.

ProbaV - 2017 Nov 4, Orbit # 130307 (NIR band)

A-68A

North

PROBAV_L2A_20171104_130307_2_100M_V101

Optical Imagery Analysis

Proba-V Antarctica Campaign Nov 2017– Feb 2018

The motion of A-68A northward due to the circulation of ocean currents

A-68A The iceberg A68A and

the fragment A68B (broken off in July 2017) are visible.

North

2017 Nov 04 2017 Dec 03

2018 Jan 06 2018 Feb 21

2017 Nov 4 2017 Dec 3 2018 Jan 6 2018 Feb 21

Optical imagery analysis: iceberg A-68 motion

Antarctica Campaign: Summary on preliminary analysis

Half of the data cannot be used (night side) Saturation needs to be verified (nominal processing) Polar stereographic projection requires additional development Pixel flags are not reliable (cloud and land) Optical images usable for glaciology application and for cryosphere experts

List of guidelines for the end users on known quality issues Better to have composite products and lat/lon coordinates

Q&A