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KTH ROYAL INSTITUTEOF TECHNOLOGY
ESA DUE INNOVATOR III: EO4UrbanMultitemporal Sentinel-1A SAR & Sentinel-2A MSI Data
for Global Urban Services
1KTH Royal Institute of TechnologyStockholm, Sweden
2University of Pavia, Italy
Yifang Ban1 and Paolo Gamba2
ESA EOEP DUE Program
The Data User Element (DUE) is a programmatic component of the Earth Observation Envelope Programme (EOEP), an optional programme of the European Space Agency, currently subscribed by 18 ESA Member States.
The DUE mission is to favour the establishment of a long-term relationship between the User communities and Earth Observation. It is a continuation on a larger scale of the Data User Programme (DUP).
ESA DUE Innovator Program
ESA DUE Innovator III Program
ESA DUE Innovator Program
ESA DUE Innovator Program
ESA DUE Innovator III Projects
Global Urban Services
Team KTH Royal Institute of Technology, SwedenUniversity of Pavia, Italy
Users Stockholm County Administration, SwedenNational Geomatics Center, China
ESA DUE Innovator III Projects
http://due.esrin.esa.int/page_news321.php
Global Urbanization Trend In 2008, more than 50% of the world population live in cities. By 2050, the world is expected to add an additional 2.5 billion
urban dwellers; with nearly 90 percent of the increase concentrated in Asia and
Africa. (United Nations, 2014).
Shanghai, 1979
Shanghai, 2010
Environmental Consequences
High concentrations of aerosols, exhaust gases, pollution and dust Hazardous to health Increased smog, haze, fog, clouds
Source: The Associated Press
Source: Suicup via Wikimedia Source: zmescience.com
Environmental Consequences
Source: BBC News Source: www.theatlanticcities.com
Source: rendezvous.blogs.nytimes.com
Paved surfaces -> rainfall water -> flooding– Urbanization results in more impervious surfaces, thus
reducing the area where infiltration to ground water canoccur. Thus, more storm water runoff occurs.
– 79 people died in July 2012 Beijing flooding
Environmental ConsequencesUrban heat island (UHI) and heat waves UHI – urban air temperatures higher than surrounding rural areas. The average air temperature in a city with 1 million inhabitants is 1-
3 degrees warmer. Heat waves: In the afternoon, the difference can be 12 degrees
warmer, no night time cooling. Death rate increases during heat waves.
Environmental Impact
The growth of urban areas & subsequent transportationnetworks generates a host of environmental impacts
Deforestation, habitat fragmentation and loss of biodiversity Loss of high quality farmland Contamination of Lakes and other waterways Increases in fossil fuel consumption & emissions of greenhouse
gases
Derived from optical data (TM, MERIS, MODIS, etc.)
Data gaps: difficulties to acquire images in appropriate seasons
Information gaps: confusions among various classes such as baresoil and builtup areas, and among vegetation classes
Existing Global Urban Data in GLC Products
Existing Global Urban Data in GLC Products
Spaceborne SAR Systems
SEASATNASA/JPL (USA)
L-Band, 1978
ERS-1European Space Agency (ESA)
C-Band, 1991-2000
SIR-C/X-SARNASA/JPL, L- and C-Band (quad)
DLR / ASI, X-bandApril and October 1994
J-ERS-1Japanese Space Agency (NASDA)
L-Band, 1992-1998
RadarSAT-1Canadian Space Agency (CSA)
C-Band, 1995-today
ERS-2European Space Agency (ESA)
C-Band, 1995-today
Shuttle Radar Topography Mission (SRTM)NASA/JPL (C-Band), DLR (X-Band)
February 2000
ENVISAT / ASAREuropean Space Agency (ESA)
C-Band (dual), 2002-today
ALOS / PALSARJapanese Space Agency (NASDA)
L-Band (quad), 2004
TerraSAR-XGerman Aerospace Center (DLR) / Astirum
X-Band (quad), 2005
RadarSAT-IICanadian Space Agency (CSA)
C-Band (quad), 2005
SAR-LupeBWB, GermanyX-Band, 2005
Range / Azimuth Resolution
10m 3m 1m 10cm
ENVISAT / ASAR
ERS 1&2 RADARSAT 1 RADARSAT 2
ALOS SENTINEL-1 Cosmo-Skymed SAR-Lupe
HJ-1-C TerraSAR-X
FGAN - PAMIR
ONERA - RAMSES
ONERA - SETHI
TerraSAR-X
Urban Extraction: ENVISAT ASAR Data
Beijing Berlin Jakarta Lagos Mexico City
Mumbai New York City Rio de Janeiro Stockholm Sydney
Average values Kappa Overall Accuracy Std. Dev. Comission Omission
KTH - UNIPV 0,707 85,36% 4% 5,47 23,75
GlobCover 0,471 72,67% 13% 17,10 40,47
MODIS 500 0,525 76,31% 11% 20,03 31,12
Ban, Y. and A. Jacob & P. Gamba, 2014. Spaceborne SAR Data for Global Urban Mapping at 30m Resolution Using a Robust Urban Extractor. ISPRS J. of Photogrammetry & Remote Sensing
KTH-Pavia vs. MODIS 500 & GlobCover
KTH‐Pavia Modis 500 Glob Cover false colorx x x redx o x bluex x o bluex o o yellowo x x greeno o x greeno x o green
Beijing 2009 Lagos 2010
Sentinel-1A SAR & -2A MSI Data
EO4Urban: Objectives
The overall objective is to evaluate multi-temporalmulti-resolution Sentinel-1A SAR and Sentinel-2AMSI data for developing a pilot global urbanservices based on user requirements to supportsustainable urban development.
The Stockholm County Administrative Board's Challenges
Very high demand for housing and regional development
VSNational interests for sustainable developmentclimate impactInfrastructureGreen structure and biodiversity
Stockholm County User Needs
Up-to-date, accurate information on urban development in the region (Urban Structures map).• No viable way to see what areas are being
developed after approved planning.• Construction process is often several years.• Up to two years delay for finished
construction to be registered in the national database.
Temporal information regarding green structure• SCAB is charged with maintaining the biodiversity and
oversee green structure• Mapping green structure and monitoring changes• No accurate biotope database exists for the region• Lots of field work, lots of manual image interpretation
Stockholm County User Needs
Accurate spatiotemporal information on waterbodies and their developments.• Climate change is a very important factor in
sustainable planning.• We lack good information on impervious
surface classes for flooding analysis.• We lack a good information on soil moisture for
risk analysis. • The coastline today is derived from Swedish
National Land Survey data and provides staticmaps. We wish to follow the developments.
Stockholm County User Needs
National Geomatics Center of China User Needs
Study Areas
Sentinel-1A SAR Data
Study area Image Date Image Type Orbit Type Polarization Incidence Angle
Bei jing 2015‐05‐12 IW DSC VV IW(1‐2)
Jakarta 2015‐05‐12 IW DSC VV IW(1‐2)
Mexico 2015‐05‐15 IW DSC VV IW(3)
Milan 2015‐03‐10 SM DSC HH/HV ~ 35° (S4)
2015‐03‐11 SM ASC HH/HV ~ 43° (S6)
Stockholm 2015‐05‐16 IW DSC VV IW(2‐3)
ENVISAT ASAR: NanchangSentinel-1A SAR: Milan
Sentinel-1A SAR: Nanchang
Sentinel-1A SAR DataStockholm Beijing
Date Orientation Polarization2014-10-08 Descending VV2014-10-22 Ascending VV2015-04-18 Descending VV2015-05-02 Ascending VV2015-05-12 Descending VV2015-05-24 Descending VH VV2015-05-26 Ascending VV
Date Orientation Polarization2014-10-12 Descending VH VV2014-10-31 Descending VH VV2015-04-10 Ascending VH VV2015-04-22 Ascending VH VV2015-05-16 Ascending VH VV2015-05-23 Descending VH VV
Methodlogy
36
Methodology
Methodology
Ban, Y. and A. Jacob, 2013. Object-based Fusion of Multitemporal Multi-angle ENVISAT ASAR and HJ-1 Multispectral Data for Urban Land-Cover Mapping. IEEE Transaction on GeoScience and Remote Sensing, Vol. 51, No. 4, pp. 1998-2006.
KTH-SEG: Stepwise Example
Preliminary Results
Study area Observation Image Overall Accuracy Urban Precision
Milan (1 image) SM ASC HH 81.81% 69.9%
Milan (dual pol) SM ASC HH & HV 78.57% 55.1%
Milan (2 images) SM ASC & DSC HH 83.21% 79.5%
Stockholm IW ASC VV 77.29% 52.3%
Preliminary Results
2015‐06‐18 4035th EARSeL Symposium, Stockholm
Preliminary Results
Preliminary Results
Preliminary Results
Preliminary Results
Preliminary Results
2015‐06‐15 4535th EARSeL Symposium, Stockholm
Preliminary Results
2015‐06‐15 4635th EARSeL Symposium, Stockholm
Preliminary ResultsChengdu 1998 -> 2003 ->2008->2011
Results: Stockholm
2015-06-15 48EARSEL SYMPOSIUM 2015 STOCKHOLM
Results: Stockholm
KTH-SEG (2015) Urban Atlas (2010)
Results: StockholmName Testing Urban AtlasWater 97,6 83Roads 36,5 17,6
High Density Builtup 72,3 31,7Low Density Builtup 59,4 53,8
Golf course 89,3 29,5Forest 81 61,9
Urban Green Structure 22,5 20,2Agricultural Open Land 77,7 37,6
Airport 55,8 36,4Average Accurracy 65,8 41,3
KTH‐SEG Urban Classification Stockholm
Confustion Matrix with Producer's and User's Accuracy in %
Name ID 1 2 3 4 5 6 7 8 9 UserWater 1 97,6 0 0 0 0,5 0 0 0 1,8 97,6Roads 2 0 36,5 6 34,2 4,9 2,6 9,4 4,2 2,2 36,5
High Density Builtup 3 0 7,4 72,3 18,7 0 0 1,6 0 0 72,3Low Density Builtup 4 0 4,1 3,6 59,4 0,2 19 12,7 1,1 0 59,4
Golf course 5 1,2 3,5 0 0,2 89,3 0,2 1,3 0,2 4,1 89,3Forest 6 0 0,2 0 10,1 0 81 8,7 0 0 81,0
Urban Green Structure 7 0 21,4 1,4 25,1 7,3 18,9 22,5 1,2 2,2 22,5Agricultural Open Land 8 0 8,4 0 3,6 2,1 0,1 1,5 77,7 6,7 77,7
Airport 9 0 4 0 4,1 33 0 0,2 2,9 55,8 55,8Producer's Acc. 100,0 14,0 79,5 64,0 60,0 83,4 10,2 98,6 14,9
Results: Beijing
2015-06-15 51EARSEL SYMPOSIUM 2015 STOCKHOLM
Results: Beijing
Sentinel-1A SAR Data are promising for urbanextent extraction, especially when multiple images intwo orbit orientations were used, the urbanextraction accuracies were significantly improved.
The preliminary results also show higher resolutionSM mode to be advantageous.
Further research and testing will be performed toevaluate and compare multitemporal Sentintel-1ASM and IW data in dual polarization in bothascending and descending orbits for urban extentextraction when more data become available
Conclusions
Conclusion
Sentinel-1A IW mode imagery showed promising potential for urban classifications.
However, Sentinel-1A IW images lack the spatial resolution required for detailed urban land cover classification
Future Research
Fusion of Sentinel-1A SAR and Sentinel-2A MSI data
Improved implementation of KTH-Pavia Urban Extractor and KTH-SEG for parallel processing environments (GPU & cluster computing)
Multi-scale segmentation & multi-level classification