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High-frequency remote monitoring of large lakes with MODIS 500 m imagery

Remote Sensing of Environment

By:
, , and
https://doi.org/10.1016/j.rse.2012.05.018

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Abstract

Satellite-based remote monitoring programs of regional lake water quality largely have relied on Landsat Thematic Mapper (TM) owing to its long image archive, moderate spatial resolution (30 m), and wide sensitivity in the visible portion of the electromagnetic spectrum, despite some notable limitations such as temporal resolution (i.e., 16 days), data pre-processing requirements to improve data quality, and aging satellites. Moderate-Resolution Imaging Spectroradiometer (MODIS) sensors on Aqua/Terra platforms compensate for these shortcomings, although at the expense of spatial resolution. We developed and evaluated a remote monitoring protocol for water clarity of large lakes using MODIS 500 m data and compared MODIS utility to Landsat-based methods. MODIS images captured during May–September 2001, 2004 and 2010 were analyzed with linear regression to identify the relationship between lake water clarity and satellite-measured surface reflectance. Correlations were strong (R² = 0.72–0.94) throughout the study period; however, they were the most consistent in August, reflecting seasonally unstable lake conditions and inter-annual differences in algal productivity during the other months. The utility of MODIS data in remote water quality estimation lies in intra-annual monitoring of lake water clarity in inaccessible, large lakes, whereas Landsat is more appropriate for inter-annual, regional trend analyses of lakes ≥ 8 ha. Model accuracy is improved when ancillary variables are included to reflect seasonal lake dynamics and weather patterns that influence lake clarity. The identification of landscape-scale drivers of regional water quality is a useful way to supplement satellite-based remote monitoring programs relying on spectral data alone.

Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
High-frequency remote monitoring of large lakes with MODIS 500 m imagery
Series title:
Remote Sensing of Environment
DOI:
10.1016/j.rse.2012.05.018
Volume:
124
Year Published:
2012
Language:
English
Publisher:
Elsevier
Contributing office(s):
Coop Res Unit Leetown
Description:
8 p.
First page:
234
Last page:
241
Online Only (Y/N):
N
Additional Online Files (Y/N):
N