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6 e 1 8A <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 />