Earth observation
scientific field based on gathering information about planet Earth's physical, chemical and biological systems via remote sensing technologies
Earth observation (EO) is the gathering of information about the physical, chemical, and biological systems of the planet Earth. It can be performed via remote-sensing technologies (Earth observation satellites) or through direct-contact sensors in ground-based or airborne platforms (such as weather stations and weather balloons, for example).
According to the Group on Earth Observations (GEO), the concept encompasses both "space-based or remotely-sensed data, as well as ground-based or in situ data". Earth observation is used to monitor and assess the status of and changes in natural and built environments.
Terminology
In Europe, Earth observation has often been used to refer to satellite-based remote sensing, but the term is also used to refer to any form of observations of the Earth system, including in situ and airborne observations, for example. The GEO, which has over 100 member countries and over 100 participating organizations, uses EO in this broader sense.
In the US, the term remote sensing has been used since the 1960s to refer to satellite-based remote sensing. Remote sensing has also been used more broadly for observations utilizing any form of remote sensing technology, including airborne sensors and even ground-based sensors such as cameras. Perhaps the least ambiguous term to use for satellite-based sensors is satellite remote sensing (SRS), an acronym which is gradually starting to appear in the literature.
Types
Earth observations may include:
numerical measurements taken by a thermometer, wind gauge, ocean buoy, altimeter or seismometer
photos and radar or sonar images taken from ground or ocean-based instruments
photos and radar images taken from remote-sensing satellites
decision-support tools based on processed information, such as maps and models
Applications
Just as Earth observations consist of a wide variety of possible elements, they can be applied to a wide variety of uses.
This brief starts where responsible research should: with the source description of “Earth observation” as scientific field based on gathering information about planet Earth's physical, chemical and biological systems via remote sensing technologies. Everything that follows is an evidence route, not borrowed authority.
Why this record matters
The subject matters to the science & nature register because the source frames it as scientific field based on gathering information about planet Earth's physical, chemical and biological systems via remote sensing technologies. Its deeper value depends on whether names, dates, institutions and citations support that framing.
The date and method of observation matter as much as the stated conclusion, especially where classification or consensus has changed. The source revision retrieved here is dated Jun 12, 2026. The linked authority identifier is Q1348989. None of the 0 selected statements returned an explicit reference.
Scientific names, classifications and consensus can change while older terminology persists in catalogues and historical literature. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “Earth observation” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.