copernicus sentinel-2 global mosaicphiweek2018.esa.int/agenda/files/presentation175.pdf ·...
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ESA UNCLASSIFIED - For Official Use www.s2gm.eu | ESRIN | 15/11/2018 | Slide 1
Copernicus Sentinel-2 Global Mosaic
ESA Phi week 201815 November 2018
BRANDT, GUNNAR (1); KIRCHES, GRIT (1); PETERS, MARCO (1); WEVERS, JAN (1); BROCKMANN, CARSTEN (1); MILČINSKI, GREGA (2); KOLARIČ, PRIMOŽ (2); MOČNIK, ROK (2) RIFFLER, MICHAEL (3), GIRTLER, FLORIAN (3)1: BROCKMANN CONSULT GMBH, GERMANY2: SINERGISE LABORATORY FOR GEOGRAPHICAL INFORMATION SYSTEMS, LTD.3: GEOVILLE INFORMATION SYSTEMS GMBH
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ESA UNCLASSIFIED - For Official Use www.s2gm.eu | ESRIN | 15/11/2018 | Slide 2
Objective and scope
• Generating composites of scientifically sound Sentinel-2 L2A surface reflectancedata on global scale
• Analysis-ready data for direct and convenient usage
• Use cases include but are not limited to REDD+1 activities, i.e. monitoring land use and deforestation
• Expert support• State-of-the art service provision
1Reducing Emissions from Deforestation and Forest Degradation and the role of conservation, sustainable management of forests and enhancement of forest carbon stocks in developing countries,
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ESA UNCLASSIFIED - For Official Use www.s2gm.eu | ESRIN | 15/11/2018 | Slide 3
Offer in a nutshell
• User-tailored mosaics and composites of Sentinel-2 L2A, best representative pixel approach
• European coverage, global coverage expected soon, conditional to global availability of Sentinel-2 L2A
• Near real-time product availability, typically few days after observation
• Free, full, and open!
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ESA UNCLASSIFIED - For Official Use www.s2gm.eu | ESRIN | 15/11/2018 | Slide 4
60m, Annual mosaic 2017
Sentinel-2 Global Mosaic allows users to tailor products 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.)Sentinel-2 data volumes and permutations of options make traditional approach of full-archive processing, storage, and distribution prohibitive. Instead: on-the-fly processing upon user request!
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ESA UNCLASSIFIED - For Official Use www.s2gm.eu | ESRIN | 15/11/2018 | Slide 5
Two Compositing Algorithms
• Short-term composite < 5 valid observations: Decision-tree approach evaluating scene
classification, similar to Landsat WELD
• MEDOID > 4 observations: Multidimensional median on entire spectrum
• Rigid pre-processing to eliminate invalid
observations
• Generating mosaics pixel
by pixel from original
observations, no spectrum averaging or
other image blending applied
• Spatial resampling of bands to non-native resolutions if needed
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ESA UNCLASSIFIED - For Official Use www.s2gm.eu | ESRIN | 15/11/2018 | Slide 6
Ordering S2GM products via Mosaic Hub
• On-request generation oftailored mosaics leveraging on cloud resources and free availability of S-2 L2A
• Mosaic Hub as interactiveuser interface
• Website and desktop application with convenient download manager
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ESA UNCLASSIFIED - For Official Use www.s2gm.eu | ESRIN | 15/11/2018 | Slide 7
Tailoring & Requesting
Dialogue-based Mosaic specification
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ESA UNCLASSIFIED - For Official Use www.s2gm.eu | ESRIN | 15/11/2018 | Slide 8
Download
• User area lists all requests
• Download manager ensures convenient and robust distribution
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ESA UNCLASSIFIED - For Official Use www.s2gm.eu | ESRIN | 15/11/2018 | Slide 9
SNAP pluginS
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ESA UNCLASSIFIED - For Official Use www.s2gm.eu | ESRIN | 15/11/2018 | Slide 10
Analysis Ready products
• Three file formats: jp2, GeoTIFF, NetCDF
• INSPIRE-compliant• Accompanied by extensive
metadata (xml, json, NetCDF Metadata)
• Atmospherically corrected, quality controlled, fixed grid, fixed periods
• Example: Exploit stack of S2GM products with Python’s xarray
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ESA UNCLASSIFIED - For Official Use www.s2gm.eu | ESRIN | 15/11/2018 | Slide 11
Analysis Ready products
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ESA UNCLASSIFIED - For Official Use www.s2gm.eu | ESRIN | 15/11/2018 | Slide 12
Analysis Ready products
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ESA UNCLASSIFIED - For Official Use www.s2gm.eu | ESRIN | 15/11/2018 | Slide 13
Time-series tool
• Generation of time-series at arbitrary locations• Single pixels or 3x3 • Direct inspection of data in the Mosaic Hub• Download as csv for further analysis
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ESA UNCLASSIFIED - For Official Use www.s2gm.eu | ESRIN | 15/11/2018 | Slide 14
S2GM website
Central entry point to all service components:• Mosaic Hub• Documentation• User support• News
https://land.copernicus.eu/imagery-in-situ/global-
image-mosaics/w
www.s2gm.eu
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ESA UNCLASSIFIED - For Official Use www.s2gm.eu | ESRIN | 15/11/2018 | Slide 15
Documentation and support
• Algorithm Theoretical Basis Document (ATBD)
• Online User Manual • Expert support via CLMS service
desk
https://land.copernicus.eu/contact-form
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ESA UNCLASSIFIED - For Official Use www.s2gm.eu | ESRIN | 15/11/2018 | Slide 16
Consortium
• Three European SMEs with complementary expertise in Earth Observationsince 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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ESA UNCLASSIFIED - For Official Use www.s2gm.eu | ESRIN | 15/11/2018 | Slide 17
Summary
Copernicus 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• is accessible via www.s2gm.eu and
via CLMS• is operated by a team of dedicated
experts ready to support users
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ESA UNCLASSIFIED - For Official Use www.s2gm.eu | ESRIN | 15/11/2018 | Slide 18
Contact [email protected] the Service desk of CLMS at
www.s2gm.eu for more information!