Ground truth is usually done on site, performing surface observations and measurements of various properties of the features of the ground resolution cells that are being studied on the remotely sensed digital image.
22.
Finally, this tricky true or false : You come to conclusions based on surface observations . ( Hint : In this case, the proper answer should begin with an " F . ")
23.
Surface observations and satellite imagery indicated the formation of a tropical depression about north of Palmyra Island on July 29 . It moved west-northwestward without developing further, and eventually dissipated on August 2 over the central Pacific.
24.
At 2 : 20 p . m . weather radar and surface observations showed . . . Locally heavy showers and isolated thunderstorms across the east . . . South and eastern interior sections of puerto rico.
25.
At 0000 UTC on September 20 the depression was upgraded to the eighth named storm of the season, Tropical Storm Harvey, based on surface observations and reports from the Hurricane Hunters . while slowly beginning to turn eastward.
26.
By using archived model forecast output along with verifying surface observations, the resulting equations implicitly take into account physical effects and processes which the underlying numerical weather prediction model cannot explicitly resolve, resulting in much better forecasts of sensible weather quantities.
27.
The airport does not have a control tower, as it is has an airspace class of E . There is both an Automated Surface Observation System ( ASOS ) and Common Traffic Advisory Frequency ( CTAF ) available at Plymouth Airport.
28.
Many weather products specific to Meteocentre will then be developed in the coming years : hourly surface observations and analyses, numerical weather prediction model charts, satellite images, lightning maps, etc . In October 2000, the site adopted its actual web address : meteocentre . com.
29.
Although EDL portion was designed to last literally a few minutes, and the surface observations at most a few days, one instrument, INRRI, was a passive laser retro-reflector that could be used as long as possible, even decades later, for laser range-finding of the lander.
30.
By 1999, computer systems and software had finally become sophisticated enough to allow for the ability to underlay on the same workstation satellite imagery, radar imagery, and model-derived fields such as atmospheric thickness and frontogenesis in combination with surface observations to make for the best possible surface analysis.
