At 337 feet above street level, the rooftop Thermometer Shelter
that was installed on the NW corner of the roof was 122 feet higher than the previous location and, as noted in the official station history record, the "dense city environment affected temperature readings erratically." In addition, the rain gauges--tipping bucket, Ferguson weighing, and Standard Stick--that were mounted on a 4.5-foot platform above the roof (south end) were negatively affected by the height of the building, as noted in this official climate record: "The building presented a large surface to the wind some 150 feet above the average level of surrounding structures.
The most important and frontier indicator for this new temporal and spatial distribution is the air temperature and humidity at the height of thermometer shelter in weather stations.
The spatial representativeness of the air temperature and humidity at the height of thermometer shelter in weather stations is about a few hundred square meters [4, 5].
The air temperature from the ground to the height of the thermometer shelter is caused by the advective driving force, turbulent driving force, and radiant driving force.
As for the radiant driving force mechanism, the temperature rises through absorbing the long-wave radiation of the surface through the moisture and carbon dioxide in the air; this kind of temperature rising acts on the entire atmosphere layer, and comparing to the entire atmosphere layer, the height from the surface to the thermometer shelter is quite thin; therefore, the radiant driving force is small, and the temperature rising of even thinner layer still acts on the sensor at the height of the thermometer shelter through the turbulence in the atmosphere.
The target of further optimization is the consistence comparison and difference correction of thermal driving sources of the area that the temperature of the weather station thermometer shelter is able to represent and the area of the MODIS pixel scale that it is located in.