Improvement of remote monitoring on water quality in a subtropical reservoir by incorporating grammatical evolution with parallel genetic algorithms into satellite imagery.
Parallel GEGA was constructed by incorporating grammatical evolution (GE) into the parallel genetic algorithm (GA) to improve reservoir water quality monitoring based on remote sensing images. A cruise was conducted to ground-truth chlorophyll-a (Chl-a) concentration longitudinally along the Feitsui Reservoir, the primary water supply for Taipei City in Taiwan. Empirical functions with multiple spectral parameters from the Landsat 7 Enhanced Thematic Mapper (ETM+) data were constructed. The GE, an evolutionary automatic programming type system, automatically discovers complex nonlinear mathematical relationships among observed Chl-a concentrations and remote-sensed imageries. A GA was used afterward with GE to optimize the appropriate function type. Various parallel subpopulations were processed to enhance search efficiency during the optimization procedure with GA. Compared with a traditional linear multiple regression (LMR), the performance of parallel GEGA was found to be better than that of the traditional LMR model with lower estimating errors.
Chen
Li
L
Department of Civil Engineering and Engineering Informatics, Chung Hua University, Hsinchu, Taiwan 30067, ROC. lichen@chu.edu.tw
Tan
Chih-Hung
CH
Kao
Shuh-Ji
SJ
Wang
Tai-Sheng
TS
D000465:Algorithms; D002734:Chlorophyll / Q000032:analysis*; D000077194:Chlorophyll A; D004784:Environmental Monitoring / Q000379:methods*; D015233:Models, Statistical; D017215:Satellite Communications; D013624:Taiwan; D014329:Tropical Climate; D014876:Water Pollution / Q000032:analysis*; D014881:Water Supply / Q000032:analysis
D002734:Chlorophyll; D000077194:Chlorophyll A