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LEAF AREA INDEX MAPS AT 30-M RESOLUTION, VALERI SITE, LAROSE, CANADA

Entry ID: LAI_MAPS_30M_VALERISITE

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Summary

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.

Related URL

Link: GET DATA

Geographic Coverage

(Click for Interactive Map)

Spatial coordinates

N: 45.39

S: 45.37

E: -75.2

W: -75.24

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/829

Online Resource: http://mercury.ornl.gov/ornldaac/send/query?term2=829&term2attribut...

Temporal Coverage

Start Date: 2003-05-08

Stop Date: 2003-08-19

Location Keywords

CONTINENT > NORTH AMERICA > CANADA > ONTARIO

Data Resolution

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

Science Keywords

ATMOSPHERE > PRECIPITATION > PRECIPITATION AMOUNT

ATMOSPHERE > PRECIPITATION > RAIN

ISO Topic Category

CLIMATOLOGY/METEOROLOGY/ATMOSPHERE

Platform

FIXED OBSERVATION STATIONS

METEOROLOGICAL STATIONS

Instrument

RAIN GAUGES

MSU > Microwave Sounding Unit

Use Constraints Please cite the data set originator if you use this data.

Data Set Progress

COMPLETE

Originating Center

UWA/JISAO

Data Center

Center for Science in the Earth System, Joint Institute for the Study of the Atmosphere and Ocean, Department of Atmospheric Sciences, University of Washington

Data Center URL: http://www.cses.washington.edu/

Data Center Personnel
Name: TODD MITCHELL Email: mitchell at atmos.washington.edu

Distribution

Distribution Media: Online (HTTP)

Distribution Format: netCDF, ASCII

Fees: no Fee

Personnel

TODD MITCHELL

Role: TECHNICAL CONTACT

Role: INVESTIGATOR

Email: mitchell at atmos.washington.edu

SCOTT A. RITZ

Role: TECHNICAL CONTACT

Phone: 301-614-5126

Fax: 301-614-5268

Email: Scott.A.Ritz at nasa.gov

Contact Address:

NASA Goddard Space Flight Center

Global Change Master Directory

City: Greenbelt

Province or State: Maryland

Postal Code: 20771

Country: USA

Publications/References

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

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