Feasibility of airborne imaging spectrometry for lake monitoring--a case study of spatial chlorophyll a distribution in two meso-eutrophic lakes

Authors: K. Kallio1; S. Koponen2; J. Pulliainen2

Source: International Journal of Remote Sensing, Volume 24, Number 19, 2003 , pp. 3771-3790(20)

Publisher: Taylor and Francis Ltd

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Abstract:

The spatial distribution of the sum of chlorophyll a and phaeophytin a concentrations (chl-a) under light wind (0-2 m s-1) conditions was studied in two lakes with an AISA airborne imaging spectrometer. Chl-a was interpreted from AISA radiance data using an algorithm based on the near-infrared (700-710 nm) to red (660-665 nm) ratio. The results of Lake Lohjanjärvi demonstrate that the use of one monitoring station can result in over- or underestimation by 29-34% of the overall chl-a compared with an AISA-based estimation. In Lake Hiidenvesi, the AISA-based estimation for the mean chl-a with 95% confidence limits was 25.19±2.18 µg l-1. The use of AISA data together with chl-a measured at 15 in situ sampling stations decreased the relative standard error of the mean chl-a estimation from 20.2% to 4.0% compared with the use of 15 discrete samples only. The relative standard error of the mean chl-a using concentrations at the three routine monitoring stations was 15.9 µg l-1 (63.1%). The minimum and maximum chl-a in Lake Hiidenvesi were 2 and 101 µg l-1, 6 and 70 µg l-1 and 11 and 66 µmg l-1, estimated using AISA data, data from 15 in situ stations and data from three routine in situ stations, respectively.

Document Type: Research article

DOI: 10.1080/014311603103446256

Affiliations: 1: Finnish Environment Institute P.O. Box 140 00251 Helsinki Finland, Email: kari.y.kallio@vyh.fi 2: Laboratory of Space Technology University of Technology P.O. Box 3000 02015 Helsinki Finland

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