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United States Department of Agriculture (USDA) 2002

DEVELOPMENT OF SATELLITE-DERIVED VEGETATION MEASURES SPECIFIC TO ARID/SEMIARID REGIONS

Satellite Vegetation Measures

United States Department of Agriculture (USDA) Research, Education & Economics Information System (REEIS)

Titre : DEVELOPMENT OF SATELLITE-DERIVED VEGETATION MEASURES SPECIFIC TO ARID/SEMIARID REGIONS

Identification : ARZT-136748-H-21-128

Pays : Etats Unis

Durée : Oct 1, 2002 à Sep 30, 2005

Domaine : Appraisal of Soil Resources ; Rangelands and grasslands, general ; Remote sensing equipment and technology ; Soil and land, general ; Meteorology and climatology ;

Partenaire : UNIVERSITY OF ARIZONA TUCSON,AZ 8572

Objectifs
In this proposal we wish to investigate various ’optical’ indicators and early warning signals of land degradation, land conversion, and desertification with the use of multi-sensor remote sensing data derived from EO-1 Hyperion, the Landsat ETM+, and the Terra- MODIS sensors. Our objective is to analyze simultaneous spatial variations in vegetation cover, species, physiognomy, albedo, and soil properties at various sites representing different stages of land degradation in the Southwest U.S.A. Our objectives include refining remote sensing methodologies for discrimination of degraded areas and the calibration of both models and algorithms over the range of vegetation conditions in arid and semiarid regions.

Descriptif
Our approach is to utilize a light aircraft-based radiometric system for rapid measurements of vegetation parameters over our degraded and transitional land cover types. The light aircraft system will allow us to sample landscape variability and analyze the interdependencies of sampling geometry, target scene, sun angle, and atmosphere conditions on satellite data. We will also conduct field based transects to measure soil and plant biophysical parameters, such as leaf area index, percent cover, and soil albedo and use the aircraft data to couple the field measures with optical measures and extend to the much larger satellite footprint.

Présentation : USDA

Page publiée le 8 décembre 2015, mise à jour le 30 octobre 2017