![]() ![]() ![]() Colour film is also sensitive to the reflected energy over the visible portion of the spectrum, but has higher spectral resolution, as it is individually sensitive to the reflected energy at the blue, green, and red wavelengths of the spectrum. Its spectral resolution is fairly coarse, as the various wavelengths of the visible spectrum are not individually distinguished and the overall reflectance in the entire visible portion is recorded. The finer the spectral resolution, the narrower the wavelength range for a particular channel or band.īlack and white film records wavelengths extending over much, or all of the visible portion of the electromagnetic spectrum. Spectral resolution describes the ability of a sensor to define fine wavelength intervals. Thus, we would require a sensor with higher spectral resolution. ![]() Other more specific classes, such as different rock types, may not be easily distinguishable using either of these broad wavelength ranges and would require comparison at much finer wavelength ranges to separate them. Broad classes, such as water and vegetation, can usually be separated using very broad wavelength ranges - the visible and near infrared - as we learned in section 1.5. Different classes of features and details in an image can often be distinguished by comparing their responses over distinct wavelength ranges. In Chapter 1, we learned about spectral response and spectral emissivity curves which characterize the reflectance and/or emittance of a feature or target over a variety of wavelengths. ![]()
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