utc

Coordinated Universal Time (UTC) is the local time at Greenwich-England, which is at 0° longitude. Satellite images and other weather observations are recorded in UTC so scientists can refer to a global time frame. You can convert UTC to local time zones in the U.S. by subtracting one hour for every 15 degrees longitude.

Resolution
The resolution of an image refers to the potential detail provided by the imagery. In remote sensing we refer to three types of resolution: spatial, spectral and temporal.
Spatial Resolution refers to the size of the smallest feature that can be detected by a satellite sensor or displayed in a satellite image. It is usually presented as a single value representing the length of one side of a square. For example, a spatial resolution of 250m means that one pixel represents an area 250 by 250 meters on the ground. 
 
Spectral Resolution refers to the ability of a satellite sensor to measure specific wavlengths of the electromagnetic spectrum. The finer the spectral resolution, the narrower the wavelength range for a particular channel or band.

Temporal resolution refers to the time between images. The capability for satellites to provide images of the same geographical area more frequently has increased dramatically since the dawn of the space age.