[ISO_Topic_Category='IMAGERY/BASE MAPS/EARTH COVER']
LEAF AREA INDEX MAPS AT 30-M RESOLUTION, VALERI SITE, LAROSE, CANADAEntry ID: LAI_MAPS_30M_VALERISITE
Abstract: This data set provide local LAI maps for the Larose (Ontario) site in Canada. These derived maps may also be useful for validating other LAI maps over this same site given that the area is protected from disturbance. The maps should be used for the given period of validity. The LAI data are suitable for use in modeling the carbon, water, energy, energy and trace gas exchange between the land ... surface and the atmosphere at regional scales. The dataset may also be useful for monitoring changes in the land surface. A complete description of producing the maps for the Larose site and the ground measurement campaign is provide in the companion document (Larose2003FTReport.pdf (link)).The Leaf Area Index (LAI) maps are at 30-m resolution for the 3x3-km Larose site. LAI is defined here as half the total (all-sided) live foliage area per unit horizontal projected ground surface area. Overstory LAI corresponds to all tree foliage except for treeless areas where it corresponds to total foliage. The algorithms were developed from ground measurements and Landsat TM and ETM+ images (Fernandes et. al., 2003). A mask was developed using the Landsat ETM+/TM5 image and available land cover maps to identify only those areas with land cover belonging to the sample land cover classes and with Landsat ETM+/TM5 spectral reflectance values that fell within the convex hull of the spectral reflectance values over the plots. LAI was mapped within the masked region using the Landsat ETM+/TM5 image and the developed transfer function. The final LAI map was scaled by a factor of 20 (offset 0). The LAI maps are in Tagged Image File Format (TIFF).The VALERI project (Validation of Land European Remote sensing Instruments) is dedicated to the validation of the products derived from medium resolution satellite sensors ( http://www.avignon.inra.fr/valeri/ ). The objectives of the VALERI project are: (1) to evaluate the absolute accuracy of the biophysical products (LAI, fAPAR, fCover) derived from large swath sensors (e.g., AVHRR, POLDER, VEGETATION, SEAWIFS, MSG, MERIS, AATSR, MODIS, MISR, GLI) using a range of possible algorithms; and (2) to inter-compare the products derived from different sensors and algorithms. For this purpose, the VALERI project has developed a network of sites distributed over the Earth's surface and a methodology designed to directly measure the biophysical variables of interest at proper spatial and temporal scales.
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Data Set Citation
Dataset Originator/Creator: ABDUELGASIM, A.BUTSON, C.FERNANDES, R.A.KHURSHID, S.K.SYLVAIN., L.
Dataset Title: LEAF AREA INDEX MAPS AT 30-M RESOLUTION, VALERI SITE, LAROSE, CANADA
Dataset Release Date: 2006
Dataset Release Place: Oak Ridge, Tennessee, U.S.A.
Dataset Publisher: Oak Ridge National Laboratory Distributed Active Archive Center
Data Presentation Form: Online Files
Dataset DOI: doi:10.3334/ORNLDAAC/829Online Resource: http://mercury.ornl.gov/ornldaac/send/query?term2=829&term2attribut...
Start Date: 2003-05-08Stop Date: 2003-08-19
Latitude Resolution: 2.5 degrees
Longitude Resolution: 2.5 degrees
Horizontal Resolution Range: 250 km - < 500 km or approximately 2.5 degrees - < 5.0 degrees
Temporal Resolution: Monthly Climatology
Temporal Resolution Range: Monthly Climatology
ISO Topic Category
Use Constraints Please cite the data set originator if you use this data.
Data Set Progress
Distribution Media: Online (HTTP)
Distribution Format: netCDF, ASCII
Fees: no Fee
Role: TECHNICAL CONTACT
Email: mitchell at atmos.washington.edu
Role: TECHNICAL CONTACT
Email: Scott.A.Ritz at nasa.gov
NASA Goddard Space Flight Center Global Change Master Directory
Province or State: Maryland
Postal Code: 20771
Legates, D. R. and C. J. Willmott, 1990. Mean seasonal and spatial
variability in gauge-corrected, global precipitation. Int. J. Climatology, 10, 111-127.
Spencer, R. W., 1993: Global oceanic precipitation from the MSU during 1979-91 and comparisons to other climatologies. J. Climate, 6, 1301-1326.
Creation and Review Dates
DIF Creation Date: 2004-10-08
Last DIF Revision Date: 2012-09-24