Comparison of NIR/RED ratio and first derivative of reflectance in estimating algal-chlorophyll concentration: A case study in a turbid reservoir

✍ Scribed by Luoheng Han; Donald C. Rundquist

• Book ID: 104165461
• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 892 KB
• Volume: 62
• Category: Article
• ISSN: 0034-4257
• DOI: 10.1016/s0034-4257(97)00106-5

✦ Synopsis

well-documented ratio of near-infrared (NIR; 705 nm) to red (670 nm) re$ectance in estimating chlorophyll

content in a relatively turbid midwestern reservoir. The results were compared with those obtained by analyzing the first derivative of refectivity near 690 nm. Data were collecten in three different months over a 2-year period, and the charactetistic spectra1 features of surface reflectante asson'ated with al& chlorophyll were analyzed. Re-.sults indicated that the NIWred ratio was not an eflective predictor of algal-chlorophyll concentration in our case, except on one occasion. The first derivative of refectance, on the other hand, was better correlated with chlorophyll concentration than the 70,5/670 band ratio. The highest correlation between the jìrst derivative and chlorophyll was at 690.7 nm.