Information Extraction in Remote Sensing
Information extraction in remote sensing can be categorized into five types as shown in Table 7.1.1. Classification is a type of categorization of image data using spectral, spatial and temporal information. Change detection is the extraction of change between multi-date images. Extraction of physical quantities corresponds to the measurement of temperature, atmospheric constitutients, elevation and so on, from spectral or stereo information. Extraction of indices is the computation of a newly defined index, for example, the vegetation index (see 10.6) from satellite data. Identification of specific features is the identification, for example, of disaster, lineament, archaeological and other features, etc.