An attempt has been made to develop a monitoring procedure taking advantage of two different sources of data (e.g., spectral reflectance data collected by Field Spectradiometer are used to calibrate and check the accuracy of results generated from Landsat-TM data.)
Ten sites were monitored along the Blood River Embayment of Kentucky Lake. A Trimble GPS unit has been used for precise location of sampling points. Water Quality Parameters, such as turbidity, suspended sediment, chlorophyll, vertical extinction coefficient, dissolved oxygen & Ph have been analyzed for these sites. The FieldSpec® FR spectradiometer has been used to measure spectra from 350 - 2500 nm at the above locations during the Landsat-TM overpass on May the 31st, 1998 (see the location map). Satellite image DN's and ground reflectance values computed from the spectradiometer have been correlated with the values derived from water samples collected during the overflight of the Landsat-TM. The satellite image DNs and the water parameter values were used as input to a regression analysis. The relationships generated using regression analysis were used to transform the satellite reflectance data to the water parameters of interest.
The following spectral data were collected using the FieldSpec® FR portable spectroradiometer (350-2500 nm) on 31 May 1998. The maximum reflectance is 1 (=100%) :
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