Skip all navigation and jump to content Jump to site navigation
NASA Logo - Goddard Space Flight Center

+ NASA Homepage

    
Goddard Space Flight Center
About MODIS News Data /images2 Science Team Science Team Science Team

   + Home
ABOUT MODIS
MODIS Publications Link
MODIS Presentations Link
MODIS Biographies Link
MODIS Science Team Meetings Link
 

 

 

Li, SH; Hu, ZC; Liu, BS; Zhao, LS; Li, ZY (2012). Parameters Optimization of Remote Sensing Drived Vegetation Gross Primary Production Model Using Ground Flux Measurement. SENSOR LETTERS, 10(6-May), 1265-1269.

Abstract
Gross primary production (GPP) is the rate of carbon fixation or gross assimilation per unit ground surface area. In general, there are two common approaches for GPP estimation: model based estimation and filed flux measurement. However, there may be patchy, and have gaps or biases using one of the methods. This study combines filed measurement with remote sensing drived GPP model, and explore the parameters optimization using the ground flux measurements. Region Production Efficiency Model (REG-PEM) is adopted in this study. 8-day GPP is calculated using REG-PEM model based on Moderate Resolution Imaging Spectroradiometer (MODIS) products and the Total Ozone Mapping Spectrometer (TOMS) ultraviolet reflectance data at Qianyanzhou station in Jiangxi province, south of China in 2003 and 2004. Comparison between field measurements and model estimation suggest that GPP from flux data are greater than REG-PEM model estimation. Correlation coefficient between flux GPP and model GPP is 0.889. In order to improve accuracy of model estimated GPP, GPP calculated from flux data at Qianyanzhou station is assimilated to REG-PEM and the model parameters are optimized. The optimization is implemented by PEST software using Gauss-Marquardt-Levenberg algorithm. Optimized parameters include carbon dioxide concentration in inner leaf, the optimum air temperature, linear parameter and uncertainty parameter.

DOI:
1546-198X

ISSN:
10.1166/sl.2012.2290

FirstGov logo Privacy Policy and Important Notices NASA logo

Curator: Brandon Maccherone
NASA Official: Shannell Frazier

NASA Home Page Goddard Space Flight Center Home Page