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General Approach for Phase 1

Two algorithms (secchi depth, chlorophyll a) were implemented which utilize collected imagery to provide water quality assessments. Secchi depth analysis was done by adapting protocols developed by Water Resource Center (WRC) and partners to provide regional lake water quality assessment of the 10,000 Lakes region at a lake or sub-lake granularity using Landsat ETM+ satellite imagery [1-3]. Microtel intends to adapt these protocols to derive a pixel level secchi depth and chlorophyll characterization of the Chesapeake Bay EO-1 satellite using EO-1 Advanced Land Imager (ALI) instrument imagery. The processing outlined in the protocol will be used to perform analysis for both algorithms, with alternate regression equations used to predict secchi depth and chlorophyll. Two regression equations were used to predict secchi depth to assess their suitability – one suggested in the protocol [1], and a second which provided superior results for Michigan Lakes [4]. Although WRC has been working to perform regional chlorophyll characterization, there experience has been that Landsat multispectral imagery does not provide reliable chlorophyll characterization for all lakes, and at this time they do not have a protocol developed for chlorophyll. Microtel elected to use a regression equation providing reasonable results in Michigan lakes [4], and an alternate equation sited as used effectively to estimate inland water quality at respective sites [5].
*Visit Data Collection to see the results of Phase 1.

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