What are advantages of Remote sensing?

The major advantages of remote sensing over ground based methods are   

a)    Synoptic view: It facilitates the study of various features of earth surface in their spatial relation to each other & helps to delineate the required features & phenomenon.

b)    Accessibility: It makes it possible to gather information about inaccessible areas where it is not possible to gather information through ground surveys.

c)    Time: These techniques save time & efforts as information about large area can be gathered quickly.

d)    Multidisciplinary applications: Remote sensing data are useful to different disciplines such as geology, fisheries, forestry, land use etc.

Advantages of Remote Sensing is that you can produce useful information without getting in physical contact with the area of interest, you dont have to visit an area for survey or data gathering.