The best data available come from a study based on systematic, on-the-ground observation.
2.
The rover also completed a miniature thermal emission spectrometer sky and ground observation.
3.
Ground observation was acceptable during the day but useless at night and in conditions of reduced visibility.
4.
Vegetation planted to obscure the base from ground observation had the opposite effect when viewed from overhead.
5.
The British had little ground observation of the German rear areas and valleys east of the ridges.
6.
The German incursions showed that the Yugoslav ground observation post network and supporting radio communications were inadequate.
7.
But Oberg said that after some initial developments, such as advanced sensors and ground observation, those plans largely fizzled.
8.
His work provided poignant on the ground observations complementing the statistical analysis of polling data by partner Nate Silver.
9.
The 28th Reserve Division positions in the Ancre valley were exposed to British ground observation and made Grandcourt a death-trap.
10.
During WWII, the British developed an air defense reporting system that combined newly-developed radar technology with intelligence and ground observation.
