3. Present Problems
1. The number of samples is limited.
2. It is difficult to measure a wide water area.
3. Research depends on the weather.
4. Water quality changes every moment.
3Actual water quality survey 3
4. Objectives
1. Estimate water quality at high resolution that can not be
measured with satellites.
2. Improve limit for the number of sample.
3. Capture changes of water quality in time
series.
Phantom4
4
4
8. Result on Multivariate analysis
Water Quality Indices Deterministic
Coefficient
Evaluation
Chlorophyll-a R² =0.974 Very good
Conductivity R² =0.736 Good
Turbidity R² =0.997 Very Good
pH R² =0.809 Good
Salt Content R² =0.863 Good 8
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11. Discussion
・Only RGB has limit for water quality mapping.
Thus, multivariable analysis should be added by
infrared imagery.
・Four multivariable analysis will be needed for every
seasons.
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12. Conclusions
1. Continuous distribution map of water quality was obtained by
UAV
2. The temporal and spatial resolution of water quality can be
greatly improved with UAV.
3. Turbidity and chlorophyll-a had high correlations with RGB
bands. Other water quality will be improved by adding infrared
bands.
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