Journal of Geo-information Science >
Design and Implementation of the PAR Calculation System Based on MODIS Data
Received date: 2012-05-07
Revised date: 2012-10-22
Online published: 2013-02-25
In this paper we developed a PAR (photosynthetically active radiation) calculation system based on PARcalc algorithm which was driven by MODIS data. Before designing, we compared the characteristic of IDL with ArcGIS Engine, and analyzed the requirements of system functions. Therefore we designed a technical scheme which integrated IDL with ArcGIS Engine together, and chose C# as the main programming language. The communication between C# and IDL is dependent on the IDL ActiveX component. Then we gave a detailed introduction to the main modules and functions of the system and analyzed the key techniques for the implementation such as programming with C# and IDL in the same environment, data partition, batch computation of incident PAR, and batch computation of daily PAR by LM (Levenberg-Marquardt) algorithm. Finally we calculated the annual and seasonal PAR in Inner Mongolia in 2007 by the system, and made a statistic of the characteristic value. The results showed that the system provided a friendly man-machine interaction. It was easy to use and met the demands of practical applications. It had great reference value for PAR calculation in regional scale.
Key words： photosynthetically active radiation; PARcalc; MODIS; IDL
CAO Wei, SHAO Quan-Qin, CHEN Zhuo-Ai . Design and Implementation of the PAR Calculation System Based on MODIS Data[J]. Journal of Geo-information Science, 2013 , 15(1) : 144 -151 . DOI: 10.3724/SP.J.1047.2013.00144
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