Canadian Centre for Remote Sensing
Land Surface Characterization
Monitoring land cover and land cover change
Workshop of ABCC Program Ottawa, Canada
23 - 24 September 2009
Canadian Centre for Remote Sensing
Rasim Latifovic, Darren Pouliot and Ian Olthof
Regional scale land cover characterization
EO based methodology for producing highly consistent annually updated land cover time series at regional scale to support environmental status and trends assessments and ecosystem process modeling.
Improved EO techniques for monitoring land cover change provide consistent and accurate multi year land cover information.
Better understanding of cause – effect relation /land cover change – global change
ABCC Project Title ABCC Project Title
Expected Results and Objectives Expected Results and Objectives
Outcome(s) and Potential Impact Outcome(s) and Potential Impact
- data collection and processing;
- methodology development;
- land cover change mapping;
- analysis and synthesis.
Canada coverage
1999-2010 data record from MODIS, Landsat-TM, and other higher resolution images.
Timeframe for Activities & Stage(s) Completion Date(s)
Study area Study area
Data Collection Plan & Timetable Data Collection Plan & Timetable
Data collection and processing Data collection and processing
• Long Term Satellite Data Record
• Medium resolution coverage
• Medium resolution coverage
• Cal\Val ground truth data
AVHRR NOAA 1km Record: 1982-2009 Transition: MetOp 2006-2020
-
---- -
MODIS NASA 0.25 km Period: 2000-2009 Transition: NPOESS,VIIRS
Long Term Satellite Data Record Long Term Satellite Data Record
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
400 900 1400 1900 2400
Wave length (nm)
Leafe reflectance AVHRR VIS/NIR/SWIR
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
400 900 1400 1900 2400
Wave length (nm)
Leafe reflectance MODIS Land bands
SPOT/VGT 1 km Period: 1998-2009
Transition: PROBA, SENTINEL 3 2012
MERIS ESA 1,0.3km Period: 2008-2009
Transition: SENTINEL 3 2012
Long Term Satellite Data Record Long Term Satellite Data Record Long Term Satellite Data Record Long Term Satellite Data Record
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
400 600 800 1000 1200 1400 1600 1800 2000 Wave length (nm)
Leafe reflectance MERIS bands
17000 17500 18000 18500 19000 19500
1980 1985 1990 1995 2000 2005 2010 2015 Year
(NDVI+1)*10000
AVHRR 1km MODIS 250m SPOT VGT 1 km
Cross calibration for multi sensors applications Cross calibration for multi sensors applications Cross calibration for multi sensors applications Cross calibration for multi sensors applications
AVHRR 1km MODIS 250m SPOT VGT 1 km
17000 17500 18000 18500 19000 19500
1980 1985 1990 1995 2000 2005 2010 2015
Year
(NDVI+1)*10000
AVHRR Calibrated to VGT 1km AVHRR uncalibrated 1 km
AVHRR/2 NOAA-06 - 14
AVHRR/3 NOAA16-18
E PoS length Int T
Medium resolution coverage Medium resolution coverage Medium resolution coverage Medium resolution coverage
S PoS
0501 0511 0521 0601 0611 0621 0701 0711 0721 0801
E PoS
0721 0801 0811 0821 0901 0911 0921 1001 1011 1021 length
30 40 50 60 70 80 90 100 110 120 130 140 150 160 170
• 2005-2010 SPOT 4-5 ortho data from CTI GeoBase
• Determine annual length of Peak of Season (PoS) from AVHRR for 2005-2009
– Lowess smoothed 10-day NDVI – 95% threshold of max NDVI
• Filter SPOT scenes to include only PoS
• Normalize to long-term median composite from 1 km VGT
1383 normalized SPOT 4-5 scenes, each acquired within peak-of-season window for its corresponding location in Canada, are included in the current database.
This sample represents approximately 42% of Canada’s landmass (excluding water).
Medium resolution coverage Medium resolution coverage Medium resolution coverage Medium resolution coverage
1km SPOT VGT 9-year median R, NIR, SWIR
Selected SPOT 20m scene Normalized SPOT 20m scene
First Acquisition – Aug 19-22, 2010 Planned Acquisition –Province of Quebec
ScanSAR Wide A Coverage in Dual Polarization ScanSAR Wide A Coverage in Dual Polarization ScanSAR Wide A Coverage in Dual Polarization ScanSAR Wide A Coverage in Dual Polarization
PJ Farris-Manning
Ground truth data Ground truth data
Land cover characterization:
Land cover characterization:
methodology development methodology development
• Land cover time series
• Abrupt land cover change (annual change)
• Abrupt land cover change (annual change)
• Gradual land cover change (multi year change)
Land cover time1
A imagem não pode ser exibida. Talv ez o computador não tenha memória suficiente para abrir a imagem ou talv ez ela esteja corrompida. Reinicie o computador e abra o arquiv o nov amente. Se ainda assim aparecer o x v ermelho, poderá ser necessário excluir a imagem e inseri-la nov amente.
Change detection abrupt and long term
A imagem não pode ser exibida. Talv ez o computador não tenha memória suficiente para abrir a imagem ou talv ez ela esteja corrompida. Reinicie o computador e abra o arquiv o nov amente. Se ainda assim aparecer o x v ermelho, poderá ser necessário excluir a imagem e inseri-la nov amente.
Map update Land cover time 2 Low spatial and high temporal resolution (yearly update)
Integrated earth observation data sources Land Cover Monitoring SystemLand Cover Monitoring SystemLand Cover Monitoring SystemLand Cover Monitoring System
Land cover time1
A imagem não pode ser exibida. Talv ez o computador não tenha memória suficiente para abrir a imagem ou talv ez ela esteja corrompida. Reinicie o computador e abra o arquiv o nov amente. Se ainda assim aparecer o x v ermelho, poderá ser necessário excluir a imagem e inseri-la nov amente.
Change detection abrupt and long term
A imagem não pode ser exibida. Talv ez o computador não tenha memória suficiente para abrir a imagem ou talv ez ela esteja corrompida. Reinicie o computador e abra o arquiv o nov amente. Se ainda assim aparecer o x v ermelho, poderá ser necessário excluir a imagem e inseri-la nov amente.
Map update Land cover time 2 High spatial and low temporal resolution (5 to 10 year update)
Calibration\Validation\Sampling
Integrated earth observation data sources
Land cover time series trough land cover update Land cover time series trough land cover update Land cover time series trough land cover update Land cover time series trough land cover update
198519851985 19901990 19951995 20002000 1985 19901990 19951995 20002000
Land CoverImage Data
Change Area
Land cover
map to be updated AVHRR Composite data (Red, NIR, NDVI) for year to be updated
Inter-map consistency = 93 %
Land Cover
Land Cover Change Land Cover Change Land Cover Change Land Cover Change
Abrupt (1-5 years) Progressive\Gradual (> 5 years)
• Fire
• Biomass harvesting
(agriculture, forest, other)
• Vegetation composition change
• Re-vegetation of disturbed lands
• Pollution related forest decline
• Storm damage (e.g. severe winds\ice)
• Permanent flooding
• Land slides
• Drought
• Urban development
• Pollution related forest decline
• Continuous low to moderate insect defoliation
• Consistent long term hydrologic changes
• Permafrost changes –active layer increase\decrease, subsidence
• Coastal\shoreline erosion
Change Detection Methodology Change Detection Methodology Change Detection Methodology Change Detection Methodology
2) Change features:
Feature1,Feature2,,Feature3, ……Feature167
3) Bootstrap feature selection 1) Radiometric normalization
4) Decision tree change classification – annual change results
5) Change persistence evaluation
Pouliot, D., R. Latifovic, R. Fernandes, and I. Olthof. (2009). Evaluation of annual forest disturbance monitoring using a static decision tree approach and 250 m MODIS data. RSE, 113:1749-1759.
Disturbances
Fraction of forest change within an 8 km pixel from 2001-2006
Abrupt land cover change (annual change) Abrupt land cover change (annual change) Abrupt land cover change (annual change) Abrupt land cover change (annual change)
Percent forest change within Landsat footprint 2000-2006
MODIS 2001 MODIS 2006 Change
Decision Tree Change Detection:
Decision Tree Change Detection: Mountain pine Mountain pine beetle damage
beetle damage
Decision Tree Change Detection:
Decision Tree Change Detection: Mountain pine Mountain pine beetle damage
beetle damage
Photo by Lorraine Maclauchlan, Ministry of Forests, Southern Interior Forest Region, Canada
2006 2005 2004 2003 2002
Disturbance year
• A system based on moderate to coarse resolution high temporal frequency EO data for monitoring seasonality events and features of snow, ice, and vegetation completing existing in situ networks.
DVD – Duration of vegetation dormancy
RLG – Rate of leaf growth
DPG – Duration of peak growing season
DGS – Duration of the growing season 0.7
0.9 DPG
RLG PGS RSLRLS
Seasonal change Seasonal change Seasonal change Seasonal change
DGS – Duration of the growing season RLS – Rate of leaf senescence
LGS – Leaf growth start LGE – Leaf growth end
PGS – Peak of growing season LSS - Leaf senescence start LSE - Leaf senescence end SMS – Snow\ice melt start SME – Snow\ice melt end
SAS – Snow\ice accumulation start SC – Snow covered
-0.5 -0.3 -0.1 0.1 0.3 0.5
0 50 100 150 200 250 300 350 400
Day of year
AVHRR NDVI RSLRLG
DVD
LGE PGS
LGS
LSS
LSE
SMS
SME SAS SC
DVD
DGS
Courtesy of http://pheno-eye.org RLS
1. Time series is divided into seasons based on
1. Season extraction 2. Initial parameter estimation
Scaled NDVI Scaled NDVI
Julian Day Julian Day
1. Time series is divided into seasons based on the least squares polynomial and harmonic basis fit of Jönsson and Eklundh (2004) Computers and Geosciences, 30:833-845.
2. Initial Lowess filter is applied to estimate logistic function parameters.
3. Double logistic function is fit:
4. Weights are adjusted through an iterative process to adjust fit to upper envelope.
(
1 ( 1 ( 1)) (
1 2 () 2))
)
( mn s t imx smnt i
e e
NDVI NDVI NDVI
t
NDVI − × − × −
+ + +
+ −
=
3&4 logistic fit & adjustment
Scaled NDVI
Julian Day
12000 12500 13000 13500 14000 14500 15000 15500 16000 16500 17000
1980 1985 1990 1995 2000 2005 2010 2015
Year
(NDVI+1)*10000
Gradual land cover change (multi year change) Gradual land cover change (multi year change) Gradual land cover change (multi year change) Gradual land cover change (multi year change)
Sturm, M., C. Racine, and K. Tape (2001). Increasing shrub abundance in the Arctic. Nature, 411, 546-547.6 AVHRR Calibrated to VGT 1km MODIS 250m SPOT VGT 1 km
Pouliot, D., R. Latifovic, and I. Olthof. (2008).Trends in vegetation NDVI from 1 km AVHRR data over Canada for the period 1985-2006. International Journal of Remote Sensing, in press.
0%
5%
10%
15%
20%
25%
30%
35%
Ice cover [%]
Trend analysis sea ice extent in Hudson and James Bay Trend analysis sea ice extent in Hudson and James Bay Trend analysis sea ice extent in Hudson and James Bay Trend analysis sea ice extent in Hudson and James Bay
1985 1993
1994
1986 1987 1988 1989 1990
1995 1996 1997 1998 1999 2000
2003 2004 2005 2006 2007 2008
2001 2002
1991 1992
2009 0%
1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 Time [year]
Latifovic, R. et .al. (2005) Generating historical AVHRR 1 km baseline satellite data records over Canada suitable for climate change studies. Canadian Journal of Remote Sensing, 31:324- 621 348.
– Maintain and improve Long Term Satellite Data Record – Completion of the medium resolution (20m) coverage of
Canada
– Reference database generation for training and validation – Further development and improvements on land cover
change detection and updating methodologies
– Testing methods for land cover change monitoring (various
Future Development Future Development Future Development Future Development
– Testing methods for land cover change monitoring (various options of combining coarse and fine resolution data)
– Development or related Canada-scale products at 0.25 km – Enhance collaborative efforts within ABCC involving
exchange of data and methods between partners.