7/24/02 MODIS Science Meeting Seasonal Variability Studies Across the Amazon Basin with MODIS Vegetation Indices Alfredo Huete 1, Kamel Didan 1, Piyachat.

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Presentation transcript:

7/24/02 MODIS Science Meeting Seasonal Variability Studies Across the Amazon Basin with MODIS Vegetation Indices Alfredo Huete 1, Kamel Didan 1, Piyachat Ratana 1, Laerte Ferreira 2, Yosio Shimabokuro 3, Tomoaki Miura 1 Gao Xiang 1 MOD13 *Terrestrial Biophysics and Remote Sensing Lab University of Arizona 1 University of Arizona, Tucson, Arizona USA 2 Universidade Federal de Goiás – UFG 3 Instituto Nacional de Pesquisas Espaciais - INPE

7/24/02 MODIS Science Meeting Validation Validation concerns the outputs or the intended uses of the VI’s so as to help the user community understand the reliability, credibility, and limitations of the products. MOD09 (SR)---> MOD13(VI) Phenology (seasonality) Change detection (Interannual) Biophysical (growth models)

7/24/02 MODIS Science Meeting MODIS Vegetation Indices ARVI Atmosphere Resistance SAVI Canopy Background Correction Soil-adjusted Vegetation Index NDVI Normalized Difference Vegetation Index EVI Enhanced Vegetation Index

7/24/02 MODIS Science Meeting Long term, time series AVHRR-NDVI data (Pathfinder 8km -yearly averaged) Accurate and stable time series data is needed for studies on interannual variation of vegetation in response to climate and for characterization of vegetation anomalies at continental and regional scales. Pinatubu Sensor degradation El Niño

7/24/02 MODIS Science Meeting *20 year averaged monthly AVHRR - NDVI in Brazil (Pathfinder 8 km) Seasonality & Phenology Role

7/24/02 MODIS Science Meeting Objectives ˚Evaluate the initial two years of MODIS Vegetation Index (VI) time series data over the Amazon Basin and surrounding regions of Brazil, ˚Examine the usefulness of MODIS data in characterizing seasonality along a climate-based ecological transect from the Brazilian cerrado to the seasonal tropical rainforests, ˚Examine the usefulness of MODIS data in discriminating land use/conversion patterns and in characterizing the resulting changes in seasonality.

7/24/02 MODIS Science Meeting MODIS EVI Seasonality ( )

7/24/02 MODIS Science Meeting

7/24/02 MODIS Science Meeting EVI NDVI Histograms of VI’s at 250 m, 500 m, and 1 km resolutions South America (August 12 to August 27, 2000)

7/24/02 MODIS Science Meeting

7/24/02 MODIS Science Meeting Brasilia National Park Blue = ASD Yellow = Digital Images

7/24/02 MODIS Science Meeting MQUALS and MODIS (Global) MODIS

7/24/02 MODIS Science Meeting EVI EVI Histogram of Brasilia Tile (Cerrado + conversions) Dry 8/00 8/01 Wet 3/02 4/01

7/24/02 MODIS Science Meeting

7/24/02 MODIS Science Meeting Cerrado Physiognomies

7/24/02 MODIS Science Meeting Cangaçu & Santana do Araguaia Red = ASD Yellow = Digital Images

7/24/02 MODIS Science Meeting MODIS VI Seasonal Profiles of Land Converted Areas biomass: to t / ha LAI: 5.61 to 7.06 biomass: ~1.3 t / ha LAI: ~2.82 biomass: 6.85 to t / ha LAI: 4.11 to 6.27 Primary Forest (“High”) Pasture site Regeneration site MODIS 250m EVI

7/24/02 MODIS Science Meeting Cerrado Forest Converted Pastures Land Conversion at Santana do Araguaia & Cangaçu (Forest - Cerrado Transition)

7/24/02 MODIS Science Meeting

7/24/02 MODIS Science Meeting Dry 11/00 11/01 Wet 7/01 4/ EVI EVI Histogram of Tapajos Tile (Seasonal Forest)

7/24/02 MODIS Science Meeting

7/24/02 MODIS Science Meeting

7/24/02 MODIS Science Meeting Litterfall Seasonal Dynamics (Tapajos) (Woods Hall/ LBA/ )

7/24/02 MODIS Science Meeting

7/24/02 MODIS Science Meeting Forest Cerrado open closed

7/24/02 MODIS Science Meeting Forest Cerrado open closed

7/24/02 MODIS Science Meeting

7/24/02 MODIS Science Meeting Conclusions (Brazil) We found MODIS to be useful in characterizing the spatial and temporal dynamics of the Amazon Basin, Multitemporal profiles of the MODIS data revealed well- defined seasonal patterns in the cerrado region with decreasing dry-wet seasonal patterns in the transitional areas near Santana do Araguaia, Seasonality was observed to a small and uncertain extent at the Tapajos National Forest site, however, it was unclear whether this was associated with seasonal changes in forest leaf area or temporal changes in understory vegetation, We further found MODIS VI seasonal patterns to significantly vary in land converted areas.

7/24/02 MODIS Science Meeting

7/24/02 MODIS Science Meeting Algorithm summary Composite result

7/24/02 MODIS Science Meeting

7/24/02 MODIS Science Meeting

7/24/02 MODIS Science Meeting Clouds, cloud shadow, and BRDF induce the largest uncertainties.

7/24/02 MODIS Science Meeting Snow Problem in VI’s NDVIEVI Snow effects: Blue > Red > NIR NDVI gives false negative signal EVI gives false positive signal

7/24/02 MODIS Science Meeting EVI & SAVI Relationships for Snow EVI RT-Model MODIS Data ( )

7/24/02 MODIS Science Meeting NDVI & EVI Relationships RT-Model MODIS Data ( )

7/24/02 MODIS Science Meeting Biophysical Validation

7/24/02 MODIS Science Meeting Trac Fpar MODIS NDVI Trac SZA 10° to 30° Trac SZA 30º to 50º Trac SZA 50º to 75º Huemmrich and Privette

7/24/02 MODIS Science Meeting Conclusions VI products are provisionally validated from radiometric, seasonal, interannual and biophysical perspectives, product accuracy has been assessed by a number of independent measurements, at a number of locations or times representative of conditions portrayed by the product. Residual cloud, cloud shadow, BRDF, topography, and snow induce the largest uncertainties in the VI’s, Assessment of feasibility of using snow product and BRDF products. VI product accuracy varies with QA.