Remote sensing is the assessment of information about an object or phenomenon without any physical contact with the particular object and thus in contrast to in situ observation. Remote sensing generally refers to the use of aerial sensor technologies to detect and classify objects on Earth by means of propagated signals. Remote sensing is of two types they are active and passive. Active remote sensing means when a signal is first emitted from aircraft or satellites and passive means when information is recorded.
High-impact journals are those considered to be highly influential in their respective fields. The impact factor of journal provides quantitative assessment tool for grading, evaluating, sorting and comparing journals of similar kind. It reflects the average number of citations to recent articles published in science and social science journals in a particular year or period, and is frequently used as a proxy for the relative importance of a journal within its field. It is first devised by Eugene Garfield, the founder of the Institute for Scientific Information. The impact factor of a journal is evaluated by dividing the number of current year citations to the source items published in that journal during the previous two years.
Last date updated on June, 2014