Xiangming Xiao Department of Botany and Microbiology, College of Arts and Sciences Center for Spatial Analysis, College of Atmospheric.

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Presentation transcript:

Xiangming Xiao Department of Botany and Microbiology, College of Arts and Sciences Center for Spatial Analysis, College of Atmospheric & Geographic Sciences Geoinformatics, College of Atmospheric & Geographic Sciences University of Oklahoma, Norman, Oklahoma Annual Maps of Tropical Evergreen Forests -- using MODIS images NASA MODIS/VIIRS Science Team Meeting, Washington, DC., January 26-28, 2010

Acknowledgement University of Oklahoma Chandrashekhar M. Biradar, Sage Sheldon, Audrey Wang, University of New Hampshire Pavel Dorovskoy, Christina Czarnecki, Michael Keller Brazilian National Institute for Space Research, INPE, Brazil Yosio Simabukuro International Institute of Tropical Agriculture, Nigeria Tunrayo Alabi Funding Sources NASA, NIH, NSF, start-up fund to faculty at University of Oklahoma

Outline of the presentation 1.Do we need to have simple algorithms for rapid mapping of tropical evergreen forests at annual scale? 2. A brief introduction on the simple algorithm 3. Annual maps of tropical evergreen forests from 2000 – 2008

Motivation in Rapid Mapping of Tropical Evergreen Forests -- Tropical evergreen forests (both broadleaf and needleleaf trees) are essential timber resources. -- Tropical evergreen forests play an important role in global carbon cycle, water cycle, climate and biodiversity. -- Deforestation in the tropical zone occurs rapidly and extensively.

Major research approaches to map tropical forests 1. Compile forest inventory statistics from individual countries, e.g. FAO Global Forest Resources Assessment (FRAs) in 1990, 2000, 2005 and Use fine resolution images (tens of meters), e.g., Landsat images from Global Land Survey projects, GLS2000, GLS2005 and GLS2010 at 5-year interval. 3. Use moderate resolution images (hundreds of meter), e.g., AVHRR  DISCover data (1-km) in SPOT Vegetation Sensor  GLC2000 MODIS  MOD12Q1 All these approaches and algorithms are time-consuming and resource-intensive, and often cannot provide annual maps of tropical forests for rapid assessment.

Normalized Difference Vegetation Index (NDVI) Enhanced Vegetation Index (EVI) Land Surface Water Index (LSWI) Biochemical perspective --- chlorophyll & water Structural perspective --- leaf area index A simple algorithm for identifying and mapping tropical evergreen forests -- Phenology-based analysis of vegetation indices of individual pixels

A simple algorithm for identifying and mapping tropical evergreen forests Evergreen forest: LSWI> 0 throughout a year (from Xiao et al., 2009, Remote Sensing,)

Global implementation of algorithms Web data portal & service: 1.A web-based data portal for automatic MODIS data acquisition from USGS EDC, data inventory, and visualization 2.Run IDL programs for vegetation indices 3.Run IDL programs for phenology-based algorithms, which identify paddy rice, wetlands, water bodies, cropping intensity, crop calendar, phenology, evergreen forests, 4.Algorithm Evaluation

Global implementation of algorithms Algorithm Evaluation -- use geo-referenced field photos as ground truth data. The photo library allows users to upload, query, interpret, and download geo-referenced field photos. It is a web tool for seeking community and citizen participation in land cover and land use mapping. Web data portal & service:

Global implementation of algorithms Algorithm Evaluation -- visualize time series data of land surface reflectance and vegetation indices of individual pixels over year(s). The web tool has an user- friendly graphical interface for users to retrieve time series MODIS data of individual pixels over the global land surface. Users can also download reflectance data for further analysis. Web data portal & service:

Global implementation of algorithms Algorithm Evaluation -- visualize and compare two maps, either from two sensors of different spatial resolutions, two vegetation indices, or two time periods of the same vegetation index. The web tool will further be developed to enable community and citizen participation in evaluating land cover and land use maps. Web data portal & service:

Annual Map of Tropical Evergreen Forests, derived from MODIS images in 2001 (from Xiao et al., 2009, Remote Sensing)

from Xiao et al., 2009, Remote Sensing MOD100 MOD12Q1 Agreement Legend Annual maps of tropical evergreen forests -- Compared with the MODIS standard land cover product (MOD12Q1)

From Xiao et al., 2009, Remote Sensing Annual maps of tropical evergreen forests -- Compared with the MODIS standard land cover product (MOD12Q1) South America

Forest Cover Annual maps of evergreen forests in Amazon, using MODIS data Rapid assessment of tropical evergreen forests and deforestation in Amazon Annual maps of tropical evergreen forests

Forest Cover Tropical evergreen forests from 2000 to 2008

Country-level comparison in State-level comparison in Annual maps of tropical evergreen forests -- Compared with the PRODES forest maps in 2000 – 2005 (state and country summaries) PRODES - Amazon Deforestation Monitoring project the Brazilian National Institute for Space Research (INPE) Landsat images

L-band PALSAR 500m mosaic browse product (9-cycles) 2007 – 2009 (HH, HV, HH/HV) Annual maps of tropical evergreen forests

Thank you for your attention! and Welcome to visit Oklahoma, USA!