Define "ground resolution."

Ground resolution refers to the area on the ground that is represented by a single pixel in an image taken from a remote sensing platform, such as a satellite or aircraft. This measurement is crucial because it determines the level of detail that can be discerned in the imagery. A higher ground resolution implies smaller areas per pixel, allowing for more detailed and finer observations of the Earth's surface features. This aspect is essential in various applications such as urban planning, agriculture monitoring, and environmental studies, where precise spatial measurements are necessary.

Other options relate to different aspects of remote sensing or digital imaging but do not directly define ground resolution. For example, the accuracy of a digital map involves how closely the map aligns with actual geographic features, which is a different concept than ground resolution. Similarly, the level of detail in a graphic file pertains to the digital representation of the image rather than the ground area depicted by each pixel. Lastly, the ability to sense objects from space describes the general capability of remote sensing technologies but does not address the specific measurement of ground resolution.