Copernicus Sentinel-2 Global Mosaic · 2018-10-18 · Copernicus Sentinel-2 Global Mosaic Objective...
Transcript of Copernicus Sentinel-2 Global Mosaic · 2018-10-18 · Copernicus Sentinel-2 Global Mosaic Objective...
www.s2gm.eu Copernicus Sentinel-2 Global Mosaic
Copernicus Sentinel-2 Global Mosaic
A short introduction
9th October 2018Carsten Brockmann, Brockmann Consult, Service Coordinator S2GM
www.s2gm.eu Copernicus Sentinel-2 Global Mosaic
www.s2gm.eu Copernicus Sentinel-2 Global Mosaic
Objective and scope• Generating composites of Sentinel-2 L2A
surface reflectance data consisting of original observations, the best representative pixel approach
• Global coverage
• Different compositing periods from 1-day to annual, three different spatial resolutions
• Analysis-ready data for direct and convenient usage
• Use cases include but are not limited to REDD+ activities, i.e. monitoring land use and deforestation
• State-of-the-art service provision
• Expert support
• Opening to public in October 2018
www.s2gm.eu Copernicus Sentinel-2 Global Mosaic
Service Offer
10m 20m 60
Yearly
Quarterly
Monthly
10-days
Daily
Surface reflectances (from sen2cor L2A)Best representative spectrum
Quality information at pixel and product level
Products
Service• User defined area selection• Configurable output (bands, format)• Processing on-demand• Downloader tool
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Processing Chain – Main Concepts
Input tile QC
Mosaicking pixel-level
I/O QC
Output tile QC pass
reject
pass
reject
tile-level QC rules
tile-level QC rules
pixel-level QC rules
L2A tile stack
recordrecord
QC meta-data
L3 mosaic
tile product
L2A filtered
tile stack
L3 mosaictile with per-pixel
QC
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Two Mosaicking Algorithms • Short-term composite < 4 valid observations:
Decision tree approach evaluating scene classification, similar to Landsat WELD
• MEDOID >= 4 observations: Multidimensional median on the entire spectrum, statistical approach
• Rigid pre-processing to eliminate invalid observations
• Generating mosaics pixel by pixel from original observations
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Valenciennes T31UER – spectral analysissufficient number of valid spectra for MEDOID
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Composite Algorithm - Wilhelmshaven V1-Delivery
28/09/2018
Wilhelmshaven Yearly composite: April 2017 – March 2018
60m spatial resolutionRGB + Mask – STC-Algorithm + Medoid-Algorithm
Monthly composites
04/2017 05/2017
03/2018
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Composite Algorithm - Wilhelmshaven V1-Delivery
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Spectra - Urban - 5x5
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Wilhelmshaven Yearly composite: April 2017 – March 2018
60m spatial resolution
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Spectra - Lake - 5x5
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Composite Algorithm - Wilhelmshaven V1-Delivery
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Wilhelmshaven Yearly composite: April 2017 – March 2018
60m spatial resolution
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Spectra - Forest - 5x5
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Composite Algorithm - Wilhelmshaven V1-Delivery
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Wilhelmshaven Yearly composite: April 2017 – March 2018
60m spatial resolution
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Spectra - Agriculture - 5x5
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Composite Algorithm - Wilhelmshaven V1-Delivery
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Wilhelmshaven Yearly composite: April 2017 – March 2018
60m spatial resolution
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Spectra - Bare area - 5x5
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Composite Algorithm - Wilhelmshaven V1-Delivery
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Wilhelmshaven Yearly composite: April 2017 – March 2018
60m spatial resolution
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Mosaic generation and distribution
• On-request generation of tailored mosaics
• Interactive user interface for productordering
• Mosaic image products
• Time-series feature for single pixel and 3x3 pixels
• Desktop applicationwith convenient download manager
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Tailoring mosaics
• Mosaics products can be tailored with respect to• Compositing period (day, 10-day,
month, quarter, year)
• Area of interest
• File format (GeoTIFF, JP2, NetCDF)
• Spatial resolution (10, 20, 60m)
• Coordinate system (WGS84, UTM)
• Bands to be included
• Auxiliary information (AOT, geometry, scene classification, etc.)
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Documentation and support• Algorithm Theoretical Basis Document
(ATBD)
• Online User Manual
• Expert support via CLMS service desk
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Consortium
• Three European SMEs with complementary expertise in Earth Observation since many years.
• Clearly defined roles in S2GM service
• Managing contract and consortium
• Mosaicking algorithms• Sentinel-2 (pre-)
processing expertise
• Maintaining S2 L2A archive
• Mosaic Hub technology• Distribution of products
• Internal quality control• Thematic expertise land
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SummaryCopernicus Sentinel-2 Global Mosaic service
• provides scientifically sound mosaics of Sentinel- 2 surface reflectance data on a global scale
• is fit for various applications
• is free to use by everyone
• accessible via Copernicus Land Monitoring Service (CLMS)
• will be publicly advertised in October
• is operated by a team of dedicated experts ready to support users
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Thank you
Contact [email protected] the Service desk of CLMS at
https://land.copernicus.eu/contact-form for more information!