Remote Sensing - The collection and interpretation of information about the Earth from a distance. Information from space, the air and ships (taking measurements of the ocean depths) significantly aids our understanding of the Earth., Passive Sensing - Sensing radiation that is naturally emitted or reflected by earth or the atmosphere. MODIS and Landsat sense passive radiation., Active Sensing - Sensing signals transmitted from a device and reflected back to it. Radar, lidar and sonar are active sensing technologies., Resolution - The detail with which a map depicts a geographic feature. The larger the map’s scale, the higher the resolution., Scale - Can be indicated with a descriptive term such as local, regional, national or global., Electromagnetic Spectrum - The range of all types of electromagnetic radiation. Radiation is energy that travels and spreads out as it goes., Multispectral and Hyperspectral Imaging - Measures and interprets many bands or segments from the electromagnetic spectrum. They are used in mining, agriculture and environmental management., Panchromatic Sensors - These are sensitive to light of all wavelengths in the visible spectrum., Radar (RAdio Detection And Ranging) or Microwave Sensors - They detect surface features on the earth by bouncing radio waves. This has the advantage of being used in all seasons and at any time of the day. They are useful because microwaves can penetrate haze, light rain and snow, clouds and smoke. They are good for viewing the earth from space., Lidar and Sonar - They detect features by bouncing laser or sound pulses respectively., Polar-orbiting Satellites - They are placed between 500 km and 800 km above the earth. It takes approximately 99 minutes for these satellites to make a single orbit. These are also called lower-orbiting or low-earth-orbit satellites., Geostationary Satellites - They are places at 36 000 km and usually hover over the same area, as their orbit coincides with the rotation of the earth so they orbit once every 24 hours. These are also called lower-orbiting satellites and good examples of these are weather-observing satellites., Spatial Resolution - The scale you are working at or the level of detail of data you are working with., Spectral Resolution - A term used in remote sensing and refers to the range of wavelengths or bands that an imaging system can detect., Temporal Resolution - How often the image is taken and how long the image is sensed each time.,

GIS - remote sensing

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