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Remote Sensing

Remote Sensing is the scientific process of acquiring information (spectral, spatial, temporal) about material objects, area, or phenomenon, without coming into physical contact with the objects, or area, or phenomenon under investigation. In remote sensing since there is no physical contact, information is transferred using electromagnetic radiation (EMR).

The Electro-Magnetic Radiation (EMR), which is reflected or emitted from an object, is the usual source of Remote Sensing data. However, any medium, such as gravity or magnetic fields, can be used in remote sensing. Wavelength regions of electro-magnetic radiation have different names ranging from Gamma ray, X-ray, Ultraviolet (UV), Visible light, Infrared (IR) to Radio Wave, in order from the shorter wavelengths.
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There are two main types of remote sensing –

  1. Passive remote sensing
  2. Active remote sensing

Passive sensors detect natural radiation that is emitted or reflected by the object or surrounding area being observed. Reflected sunlight is the most common source of radiation measured by passive sensors. Examples of passive remote sensors include film photography, Infrared, charge-coupled devices and radiometers.

Active collection, on the other hand, emits energy in order to scan objects and areas whereupon a sensor then detects and measures the radiation that is reflected or backscattered from the target. RADAR is an example of active remote sensing where the time delay between emission and return is measured, establishing the location, height, speed and direction of an object.

Schnell’s Remote Sensing services includes capturing, storing, integrating, manipulating, analyzing, and displaying data related to positions on the Earth's surface. We have strong experience in -

  • Image Correction
  • Image Enhancement
  • Land use land cover mapping for environmental applications
  • Change Detection Services
  • Forest density mapping and species level forest mapping
  • Forest fire mapping
  • Feature extraction and Digital Terrain and Surface Modeling
  • Hyperspectral based mineral mapping