100468122-Photogrammetry-and-Remote-Sensing

Application g apply extracted information about the

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Application (G): Apply extracted information about the target in order to: Gain better understanding of that object, Reveal some new information, or Assist in solving a particular problem. Remote Sensing Ayman F. Habib 10 Resolutions The characteristics of remote sensing systems can be described by the following types of resolutions: Spatial resolution, Radiometric resolution, Spectral resolution, and Temporal resolution. These resolutions control our ability to interpret remote sensing data. Remote Sensing Ayman F. Habib 11 Spatial Resolution Spatial resolution dictates the amount of discernible details in an image: The size of the smallest possible feature that can be detected. In general the spatial resolution depends on the Instantaneous Field of View (IFOV) , A, of the implemented sensor. The IFOV is the angular cone of visibility of the sensor. The projection of the IFOV into the surface of the earth is known as the resolution cell (B). The spatial resolution is mainly controlled by the separation between the sensor and the target (C). Remote Sensing Ayman F. Habib 12 Spatial Resolution
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Remote Sensing Ayman F. Habib 13 Spatial Resolution For a homogeneous feature to be detected, its size has to be equal to or larger than the resolution cell. If the feature is smaller than this, it may not be detectable as the average brightness of all features in that resolution cell will be recorded. However, smaller features may sometimes be detectable if their reflectance dominates within a particular resolution cell allowing sub-pixel or sub-resolution cell detection. Remote Sensing Ayman F. Habib 14 Spatial Resolution LANDSAT (15m) SPOT (10m) KOMPSAT-1 (6m) IKONOS (1m) LANDSAT (30m) Remote Sensing Ayman F. Habib 15 Electromagnetic Radiation Remote Sensing Ayman F. Habib 16 Spectral Resolution Spectral resolution describes the ability of a sensor to define fine wavelength intervals. The finer the spectral resolution, the narrower the wavelength range for a particular channel or band. Black and white film records wavelengths extending over much, or all of the visible portion of the electromagnetic spectrum. Color film is individually sensitive to the reflected energy at the blue, green, and red wavelengths of the spectrum. Color film has higher spectral resolution when compared to black and white film. Remote Sensing Ayman F. Habib 17 Spectral Resolution Spectral sensitivity of black and white films Spectral sensitivity of color film Remote Sensing Ayman F. Habib 18 Spectral Resolution
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Remote Sensing Ayman F. Habib 19 Spectral Resolution multi-spectral sensors record energy over several separate wavelength ranges at various spectral resolutions. Advanced multi-spectral sensors called hyper- spectral sensors, detect hundreds of very narrow spectral bands throughout the visible, near- infrared, and mid-infrared portions of the electromagnetic spectrum.
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