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Mapping diffuse photosynthetically active radiation from satellite data in Thailand

journal contribution
posted on 2023-05-19, 14:50 authored by Choosri, P, Janjai, S, Manuel NunezManuel Nunez, Buntoung, S, Charuchittipan, D
In this paper, calculation of monthly average hourly diffuse photosynthetically active radiation (PAR) using satellite data is proposed. Diffuse PAR was analyzed at four stations in Thailand. A radiative transfer model was used for calculating the diffuse PAR for cloudless sky conditions. Differences between the diffuse PAR under all sky conditions obtained from the ground-based measurements and those from the model are representative of cloud effects. Two models are developed, one describing diffuse PAR only as a function of solar zenith angle, and the second one as a multiple linear regression with solar zenith angle and satellite reflectivity acting linearly and aerosol optical depth acting in logarithmic functions. When tested with an independent data set, the multiple regression model performed best with a higher coefficient of variance R2 (0.78 vs. 0.70), lower root mean square difference (RMSD) (12.92% vs. 13.05%) and the same mean bias difference (MBD) of −2.20%. Results from the multiple regression model are used to map diffuse PAR throughout the country as monthly averages of hourly data.

History

Publication title

Advances in Space Research

Volume

60

Issue

11

Pagination

2345-2354

ISSN

0273-1177

Department/School

School of Geography, Planning and Spatial Sciences

Publisher

Pergamon-Elsevier Science Ltd

Place of publication

The Boulevard, Langford Lane, Kidlington, Oxford, England, Ox5 1Gb

Rights statement

Copyright? 2017 COSPAR. Published by Elsevier Ltd. All rights reserved.

Repository Status

  • Restricted

Socio-economic Objectives

Forestry not elsewhere classified

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