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� � �..r�a,,,,.�`a' '�; .. x . .._. .. <br /> • Slope of terrain should be less than five degrees to avoid having to consider aspect on <br /> surface radiation measurements. <br /> Temperature and Relative Humidity: <br /> • To be compliant with existing observations and airport stations, temperature and RH <br /> should be made at the standard height of 1.5 m. <br /> Pressure: <br /> • Sensors must be designed to minimize dynamic pressure. <br /> Precipitation: <br /> • Reduce the effects of wind by using a wind shield. <br /> • Gage should be over level ground and surrounding objects should not be closer to the <br /> gage than a distance equal to four times their height. <br /> Soil Temperature and soil moisture <br /> • Soil should be representative of the entire area. <br /> • Standard depths for soil temperature measures are 5, 10, 20, 50, and 100 cm <br />