Remote Sensing Scanners. Introduction to Remote Sensing Dr. Stuart Murchison. Multispectral Scanners. Advantages over multiband camera systems: Photographic systems: 0.3-0.9 m spectral range of sensing, wider bands Multispectral scanners: 0.3-14 m, more (and narrower) bands
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Introduction to Remote Sensing
Dr. Stuart Murchison
Each line is scanned from one side of the sensor to the other, using a rotating mirror (A). As the platform moves forward over the Earth, successive scans build up a two-dimensional image of the Earth´s surface. The incoming reflected or emitted radiation is separated into several spectral components that are detected independently. The UV, visible, near-infrared, and thermal radiation are dispersed into their constituent wavelengths. A bank of internal detectors (B), each sensitive to a specific range of wavelengths, detects and measures the energy for each spectral band and then, as an electrical signal, they are converted to digital data and recorded for subsequent computer processing.
Characteristics of the Daedalus Airborne Multispectral Scanner
Charge coupled devices, called CCD, are mostly adopted for linear array sensors. Therefore it is sometime called a linear CCD sensor or CCD camera. HRV of SPOT, MESSR of MOS-1, and OPS of JERS-1 are examples of linear CCD sensors as is the Itres CASI airborne system. As an example, MESSR of MOS-1 has 2048 elements with an interval of 14 mm. However CCD with 5,000 - 10,000 detector elements have been developed and available recently made available.
physicists and chemists for over 100 years for identification
of materials and their composition.
features due to specific chemical bonds in a solid, liquid, or
gas. With advancing technology, imaging spectroscopy has
begun to focus on identifying and mapping Earth surface
mid-80's and to this point has been used most widely by
geologists for the mineral mapping.
Atmosphere: water vapor, cloud properties, aerosols
Ecology: chlorophyll, leaf water, cellulose, pigments, lignin
Geology: mineral and soil types
Coastal Waters: chlorophyll, phytoplankton, dissolved organic materials, suspended sediments
Snow/Ice: snow cover fraction, grain size, melting
Biomass Burning: subpixel temperatures, smoke
Commercial: mineral exploration, agriculture and forest production