Images of Fiji
Mati Kahru, mkahru@ucsd.edu
Explanation: shown here are 2 types of images, generated from atmospherically corrected MODIS data.
- RGB = a true color like image using band 1 (620-670 nm) for Red, band 3 (459-479 nm) for Blue, and band 4 (545-565 nm) for Green.
- Reflectance = Combined reflectance by bottom and materials in the water calculated by subtracting band 2 (841-876 nm) reflectance from band 1 (620-670 nm) reflectance.
- More
details on processing of the MODIS data can be found in: Kahru et al.,
MODIS detects a devastating algal bloom in
- Two periods (January-March of 2000 and 2004) are compared to detect any possible changes due to coral bleaching, etc. Bleached corals should have higher reflectance. However, the potential influence of water depth due to different tidal cycle has not been eliminated.
2000 January-March
MOD02QKM.A2000058.2230, RGB RGB, Large Reflectance
MOD02QKM.A2000065.2235, RGB RGB, Large Reflectance
MOD02QKM.A2000067.2225, RGB RGB, Large Reflectance
MOD02QKM.A2000074.2230, RGB RGB, Large Reflectance
MOD02QKM.A2000081.2235, RGB RGB, Large Reflectance
MOD02QKM.A2000083.2235, RGB RGB, Large Reflectance
MOD02QKM.A2000090.2235, RGB RGB, Large Reflectance
2004 January-March
MOD02QKM.A2004037.2215, RGB RGB, Large Reflectance
MOD02QKM.A2004053.2215, RGB RGB, Large Reflectance
MOD02QKM.A2000062.2210, RGB RGB, Large Reflectance
MOD02QKM.A2004076.2220, RGB RGB, Large Reflectance
MOD02QKM.A2004078.2210, RGB RGB, Large Reflectance
Map of reef areas for time series analysis
Reflectance of reef areas 1 and 2 in 2000 and 2004.
Each point is a median reflectance (MODIS band1 – band2)
for the selected reef area.
