HR: 0830h
AN: B21E-0764 [PDF]
TI: New Features of the Collection 4 MODIS LAI and FPAR Product
AU: * Bin, T
EM: tanbin@crsa.bu.edu
AF: Boston University, 675 Commonwealth Ave., #457, Boston, MA 02215 United States
AU: Yang, W
EM: ywze@crsa.bu.edu
AF: Boston University, 675 Commonwealth Ave., #457, Boston, MA 02215 United States
AU: Dong, H
EM: dh@crsa.bu.edu
AF: Boston University, 675 Commonwealth Ave., #457, Boston, MA 02215 United States
AU: Shabanov, N
EM: shabanov@crsa.bu.edu
AF: Boston University, 675 Commonwealth Ave., #457, Boston, MA 02215 United States
AU: Knyazikhin, Y
EM: jknjazi@crsa.bu.edu
AF: Boston University, 675 Commonwealth Ave., #457, Boston, MA 02215 United States
AU: Myneni, R
EM: rmyneni@crsa,bu.edu
AF: Boston University, 675 Commonwealth Ave., #457, Boston, MA 02215 United States
AB:
An algorithm based on physics of radiative transfer in vegetation canopies for the retrieval of vegetation green leaf area
index (LAI) and fraction of absorbed photosynthetically active radiation (FPAR) from MODIS surface reflectance data was
developed, prototyped and is in operational production at NASA computing facilities since June 2000. This poster highlights
recent changes in the operational MODIS LAI and FPAR algorithm introduced for collection 4 data reprocessing. The changes to
the algorithm are targeted to improve agreement of retrieved LAI and FPAR with corresponding field measurements, improve
consistency of Quality Control (QC) definitions and miscellaneous bug fixes as summarized below.
* Improvement of LUTs for the main and back-up algorithms for biomes 1 and 3. Benefits: a) increase in quality of retrievals;
b) non-physical peaks in the global LAI distribution have been removed; c) improved agreement with field measurements
* Improved QA scheme. Benefits: a) consistency between MODLAND and SCF quality flags has been achieved; b)ambiguity in QA has
been resolved
* New 8-day compositing scheme. Benefits: a) compositing over best quality retrievals, instead of all retrievals; b) lowers
LAI values, decreases saturation and number of pixels generated by the back-up
* At-launch static IGBP land cover, input to the LAI/FPAR algorithm, was replaced with the MODIS land cover map. Benefits: a)
crosswalking of 17 classes IGBP scheme to 6-biome LC has been eliminated; b) uncertainties in the MODIS LAI/FPAR product due
to uncertainties in land cover map have been reduced
DE: 0400 Biogeosciences
SC: Biogeosciences [B]
MN: 2003 Fall Meeting