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LC-06 Abstract

Validation and Evaluation of MODIS Data Products in the Large Scale Biosphere-Atmosphere Experiment in Amazonia (LBA)

Alfredo R. Huete — University of Arizona (US-PI)
Yosio Edemir Shimabukuro — INPE - Instituto Nacional de Pesquisas Espaciais (SA-PI)

Objectives





The MODIS Instrument Land Science Team (MODLAND) proposes to provide, evaluate, and

validate an array of standard data products as tools for moderate resolution land surface

monitoring and ecology over Amazonia.


The LBA experiment and sites will enable us to evaluate the quality and performance of our

products in conjunction with in-situ measures of various ecological parameters. MODLAND

will make available level 2 and level 3 gridded MODIS data products to the LBA-ECO

Science Team so as to maximize data usefulness and evaluation by the broader scientific

community. We plan on working over both LBA transects, encompassing dry and wet tropical

forests, cerrado, and various classes of land use conversions.





Research Team Responsibilities











  • Alfredo Huete: Spectral vegetation indices.


  • Chris Justice: fire and thermal anomalies.


  • Jan-Peter Muller: albedo and BRDF.


  • Ranga Myneni: leaf area index (LAI), fraction of absorbed photosynthetically active

    radiation (fAPAR).


  • Steve Running: net primary production (NPP)


  • Yosio Shimabukuro: biophysical products.


  • Alan Strahler: BRDF and albedo.


  • John Townshend: land cover and land cover change.


  • Eric Vermote, University of Maryland: atmospherically-corrected, surface reflectances.


  • Zhengming Wan, University of California, Santa Barbara: surface temperature.













The MODIS land discipline group is developing remote sensing algorithms for deriving

time-series data products of various terrestrial geophysical parameters, useful to

regional-scale ecological studies of Amazonia.


Atmospheric Correction and Surface Reflectance: MODIS will provide atmospherically

corrected (Rayleigh, ozone, water, and aerosols) data sets over the LBA sites in bands

1-7, centered at 648 nm, 858 nm, 470 nm, 555 nm, 1240 nm, 1640 nm, and 2130 nm with

respective resolutions of 250 m (bands 1,2); and 500 m (bands 3-7).


Land Surface Temperature and Fire Products: MODIS will provide daytime and nighttime LST

at 1 km and 5 km spatial resolutions, at daily, 8-day and monthly temporal frequencies.

The MODIS fire products will provide information on the distribution of fires and their

frequency and timing. The active fire products will be generated shortly after launch

(6/98) and the burned area products are planned for release one year later.


Vegetation Indices (Vis) and Biophysical Products: Two vegetation indices will be produced

at 16-day and monthly intervals; the standard Normalized Difference Vegetation Index

(NDVI) and an Enhanced Vegetation Index (EVI) designed for extended sensitivity into high

biomass, chlorophyll-saturated, conditions. A number of vegetation biophysical parameters

will be produced to describe vegetation canopy structure (LAI) and the fraction of

absorbed photosynthetically active radiation (fPAR). The LAI and fPAR products will be

produced at 8- and 16-day intervals. MODIS will also produce a Net Photosynthesis/ Net

Primary Productivity product utilizing the spatial and temporal dynamics of the LAI/ FPAR

products in conjunction with a BIOME-BGC ecosystem simulation model.


Land Cover and Land Cover Change: MODIS is developing two products, a Land Cover

(classification) product that will map the terrestrial surface of the world into land

cover classes; and a Land Cover Change product that will detect areas of change and

identify the type of change process occurring. The algorithm for mapping global

terrestrial land cover will be at a 1 km resolution. The land cover change product will

detect areas of change and identify types of change processes as they occur.


Spectral Albedo and BRDF: The MODLAND team will produce a global BRDF product at 1km

spatial resolution for the entire terrestrial surface at 16-day intervals, utilizing both

MODIS and MISR data sets.





Preferred Site





We plan on validating our products at all LBA sites, particularly in the vicinity of

the LBA-towers.





Activities





We plan to begin providing and archiving MODIS imagery of each product in September

1998. Most of our field activities related to validation will be conducted in coordination

with the LBA science team and LBA field activities. We plan to participate in joint field

activities with the LBA science team once a clear experimental plan is formed.









Last Updated: May 18, 1998

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