In the broadest sense, remote sensing is the measurement or acquisition of information of an object or phenomenon, by a recording device that is not in physical or intimate contact with the object.
It is the utilization at a distance (as from aircraft, spacecraft, satellite, or ship) of any device for gathering information about the environment. The technique can make use of devices such as a camera, laser, radar, sonar, seismograph or a gravimeter. Modern remote sensing normally includes digital processes but can as well be done with non-digital methods.
This kind of data collection normally makes use of the emitted or reflected electromagnetic radiation of the examined object in a certain frequency domain (infrared, visible light, microwaves). This is possible due to the fact that the examined objects (plants, houses, water surfaces, air masses ...) reflect or emit radiation in different wavelengths and in different intensity according to their current condition. Some remote sensing systems use sound waves in a similar way, and others measure variations in gravitational or magnetic fields.
While all astronomy could be considered remote sensing (in fact, extremely remote sensing) the term "remote sensing" is normally only applied to terrestrial observations.
Examples of remote sensing are very numerous. For example:
- Topographical maps were often produced from stereographic pairs of aerial photographs. Trained personnel would then trace the shape of the land onto maps.
- Earthquakes are located (after the fact) by comparing seismograms taken at different locations; the relative intensity and precise timing yield information about the location and nature of the tremor.
- Digital elevation maps can be produced by interferometric synthetic aperture radar, a process in which an aircraft, spacecraft, or satellite passes over the target area while emitting a series of radar pulses. Combining the data from these pulses yields a detailed map containing information about ground cover and possibly elevation or movement on a scale of centimeters. The data usually covers a swath many kilometers wide.
See also: GIS, Aerial photography
Source | Copyright
Webmasters: Add your website here:
Readers: Edit |
Center for Airborne Remote Sensing and Technology and Applications Development
Promotes remote sensing through the support of the airborne remote sensing business and of activities related to airborne remote sensing.
Andrew S. Milman
Papers related to remote sensing and information on research into synthetic aperture radar.
Airborne Laser Mapping Web Site
A reference site dedicated to the emerging technology of airborne laser mapping. Of interest to surveyors, GIS specialists, aerial photogrametrists or others involved in remote sensing or mapping industries.
James Williamson, Ph.D., uses the available photographs or videos along with the Reports and Statements made by Investigators to provide suitable data to have 2D drawings and expand the 2D drawings into 3D frame/animation.
United States Geological Survey (USGS): Landsat 7 satellite images.
ScanEx Satellite Imagery Archive
Archive of images from Russian earth observation satellites. Imagery data for remote sensing applications.
Collaborative effort between researchers and forest resource managers on integrating satellite technologies into forest inventory and field methods.
Remote Sensing Principles
Introduction from the Virtual Science Center.
Free GIS data, daily industry news, GIS events listing, discussion forums, and software downloads.
Remote Sensing Institute at Michigan Tech
Promotes research and education in imaging science, atmospheric science, data/signal processing, data visualization and remote sensing instrumentation.
Interactive Visualizer and Image Classifier for Satellites
General purpose satellite image visualization software which supports MODIS, ASTER, AVHRR, and VIRS data.
The World-Wide Web Virtual Library
Remote sensing links.
Advances in Environmental Monitoring and Modelling
Collection of abstracts and papers on monitoring volcanic hotspots using thermal remote sensing.
InfraMation - The Thermographers Conference
Annual conference to be held September 29 through October 2 in Orlando, Florida, for infrared camera users and thermographers involved in predictive maintenance, online process monitoring and non destructive testing.
Epsilon Nought - Radar Remote Sensing
Epsilon nought gives an introduction into radar remote sensing and related problems with tutorials, excercises, demo data sets as well as software examples.
Earth Observation Data from the European Space Agency.
Space Satellite Sensing
MSN community focused on space imagery and online discussion of related topics.
Manuel Arbelo - Department of Physics, University of La Laguna
Personal page of a researcher focused on remote sensing and development of satellite algorithm to derive surface temperature (SST and LST).
Land Use and Land Cover Group
New York Climate and Health Program study to determine the effects of urban growth on public health and air quality in the greater New York using remote sensing data.
The German Remote Sensing Data Center
Information about remote sensing, evaluation and monitoring, with animated satellite data.
Canada Centre for Remote Sensing - Glossary
Database includes radar, optical and airborne remote-sensing terms and their related acronyms.
MODIS (the MODerate Resolution Imaging Spectroradiometer)
Provides extensive and updated information about the Moderate Resolution Imaging Spectroradiometer, flown on two NASA spacecraft (Terra and Aqua)