</p>
<p>

Although limited verification data exists, validation of satellite LST retrivals with in situ measurements shows general agreement to within 1.5 degrees Celsius. A crude validation conducted using bucket samples with a standard thermometer and a Raytec infrared sensor found satellite-derived LST measurements accurate to within 1.5 degrees Celsius on all but one occasion:

<center><a href="Tvali1.gif/view"><img src="Tvali1.gif/variant/medium"/> </a><br/>Satellite-derived LST versus In Situ Observations </center>
</p>
<p>

Surveys of lake temperature conducted by the Utah Division of Wildlife Resources (DWR) GSL Ecosystem Project on 2 November 2004 under clear sky conditions also show that the satellite retrievals appear to be describing the magnitude of spatial LST variability relatively well.

<center><a href="Tvali2.gif/view"><img src="Tvali2.gif/variant/medium"/> </a><i><br/></i>Comparision of in situ temperature (black dots) and AVHRR LST (shading) on 2 and 3 November 2004</center>

</p>
<p>
There are many sources of in situ data that may be used in the future for a complete validation study. The Hat and Gunnison Island weather stations both are equipped with lake temperature sensors, although the Hat Island station is above water level (the Gunnison station was resubmerged in September 2005). In addition, lake temperature data is also available from the USGS, Utah Geological Survey, and NOAA bouy data from the summer of 1991.