Promoting Earth Observation ServicesSenSyF: Sentinels Synergy FrameworkPromoting Earth Observation Services
S5: Multitemporal Cloud DetectionAntonio Ruiz-Verdú, Julia Amorós-López, Luis Gómez-Chova,
Jordi Muñoz-Marí, Gustavo Camps-Valls and José MorenoSenSyF Users WorkshopMadrid. 11th March 2015
Promoting Earth Observation Services
2SenSyF Workshop. Madrid. 11th March 2015
Service Overview
• Sentinel-2 will provide systematic global coverage at high spatial and temporal resolutions.
• Challenges: advanced approaches are required to handle the incoming time series
• SenSyF Service 5 is intended to demonstrate the Sentinels capabilities for multitemporal applications
• A Multitemporal Cloud Detection (MCD) algorithm was chosen for demonstrating those capabilities
Promoting Earth Observation Services
3SenSyF Workshop. Madrid. 11th March 2015
Overview of the MCD processorTime series Cloud mask
• Main assumptions: – Land covers change smoothly– Abrupt changes are mainly due to clouds
Promoting Earth Observation Services
4SenSyF Workshop. Madrid. 11th March 2015
Sentinel-2
• Dedicated 5-day revisit time series of SPOT-4 (February - July 2013), available at ESA’s DUE (Take 5 dataset)
• Landsat-8 time series at 16-day revisit times
Input Test Data
Promoting Earth Observation Services
5SenSyF Workshop. Madrid. 11th March 2015
Deployment and testing in SenSyF Sandbox
• MCD processor implemented for 3 options with different degree of parallelizarion
• Image time series dataset (SPOT4-
take5 & Landsat-8) uploaded
• MATLAB functions deployed
• Processor tested
Promoting Earth Observation Services
6SenSyF Workshop. Madrid. 11th March 2015
Deployment and testing in SenSyF Sandbox
• Demonstration and Validation Tests implemented in 8 SPOT-4 and Landsat-8 time series
• Good results compared with other cloud screening approaches
Promoting Earth Observation Services
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DT1 ARGENTINA SITE
SPOT-4 TAKE 5 RGB
SenSyF Workshop. Madrid. 11th March 2015
Promoting Earth Observation Services
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ARGENTINA SITE
SenSyF S5MCD Cloud Mask
SenSyF Workshop. Madrid. 11th March 2015
Promoting Earth Observation Services
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DT1 ARGENTINA SITE
MULTITEMPORAL L2A SAT.TIF
SenSyF Workshop. Madrid. 11th March 2015
Promoting Earth Observation Services
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DT1 ARGENTINA SITE
MONOTEMPORAL L2A SAT.TIF
SenSyF Workshop. Madrid. 11th March 2015
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ARGENTINA SITE
• Crop lands• Monotemporal
mask fails with cirrus clouds
Deployment and testing in SenSyF Sandbox
SenSyF Workshop. Madrid. 11th March 2015
Promoting Earth Observation Services
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DT2 ARGENTINA SITE
SPOT-4 TAKE 5 RGB
SenSyF Workshop. Madrid. 11th March 2015
Promoting Earth Observation Services
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DT2 ARGENTINA SITE
SenSyF S5MCD Cloud Mask
SenSyF Workshop. Madrid. 11th March 2015
Promoting Earth Observation Services
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DT2 ARGENTINA SITE
MULTITEMPORAL L2A SAT.TIF
SenSyF Workshop. Madrid. 11th March 2015
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DT2 ARGENTINA SITE
MONOTEMPORAL L2A SAT.TIF
SenSyF Workshop. Madrid. 11th March 2015
Promoting Earth Observation Services
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• A processor for cloud detection and masking, based on image time series, was successfully implemented in the SenSyFcloud computing framework
• Some key benefits:– The framework allowed us to test computationally demanding versions
of the algorithm – Learning cloud computing usage and capabilities– Possibility to offer service to a big potential user’s community– User’s feedback
Summary
Promoting Earth Observation ServicesSenSyF: Sentinels Synergy FrameworkPromoting Earth Observation Services
S5: Multitemporal Cloud DetectionAntonio Ruiz-Verdú, Julia Amorós-López, Luis Gómez-Chova,
Jordi Muñoz-Marí, Gustavo Camps-Valls and José MorenoSenSyF Users WorkshopMadrid. 11th March 2015
Promoting Earth Observation Services
18SenSyF Workshop. Madrid. 11th March 2015
Deployment and testing in SenSyF Sandboxapplication.xml run.sh
Promoting Earth Observation Services
19SenSyF Workshop. Madrid. 11th March 2015
Deployment and testing in SenSyF Sandbox
Promoting Earth Observation Services
20SenSyF Workshop. Madrid. 11th March 2015
Migration to Operational Cloud Environment (OCE)