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Scientific Investigations Report 2009–5162

Table Rock Lake Water-Clarity Assessment Using Landsat Thematic Mapper Satellite Data

By Gary W. Krizanich and Michael P. Finn

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Abstract

Water quality of Table Rock Lake in southwestern Missouri is assessed using Landsat Thematic Mapper satellite data. A pilot study uses multidate satellite image scenes in conjunction with physical measurements of secchi disk transparency collected by the Lakes of Missouri Volunteer Program to construct a regression model used to estimate water clarity. The natural log of secchi disk transparency is the dependent variable in the regression and the independent variables are Thematic Mapper band 1 (blue) reflectance and a ratio of the band 1 and band 3 (red) reflectance. The regression model can be used to reliably predict water clarity anywhere within the lake. A pixel-level lake map of predicted water clarity or computed trophic state can be produced from the model output. Information derived from this model can be used by water-resource managers to assess water quality and evaluate effects of changes in the watershed on water quality.

Posted July 15, 2009

For additional information contact:
Director
U.S. Geological Survey
Mid-Continent Geographic Science Center
1400 Independence Road, Mail Stop 236
Rolla, MO 65401
(573) 308–3593
Or visit the Mid-Continent Geographic Science Center website at:
http://mcgsc.usgs.gov/

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Suggested citation:

Krizanich, G. W., and Finn, M. P., 2009, Table Rock Lake water-clarity assessment using landsat thematic mapper satellite data: U.S. Geological Survey Scientific Investigations Report 2009–5162, 9 p.



Contents

Abstract

Introduction

Methods

Results

Summary

Acknowledgments

References Cited


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