Remote sensing technology is most effective at scientists?

"Remote sensing technology" is most effective at helping scientists in "observing the Earth from a distance".

Explanation:

The remote sensing technology, as the name suggests, serves the purpose of collecting crucial information of places that cannot be easily reached. For example - deep-sea floors, deep space, etc. The remote sensing technology has made it possible for scientists to get hold of the data that otherwise would have been impossible to fetch. Remote sensing technology makes use of advanced sensors and compact cameras to fetch data from even the most inaccessible areas.

Sequoia national park  /  inyo national forest, california, u.s. mount whitney is the tallest mountain in california, as well as the highest summit in the contiguous united states and thesierra nevada—with an elevation of 14,505 feet (4,421 m).