Question
Discuss the image characteristics of a metamorphic terrain.
Answer :
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Metamorphic terrains exhibit distinctive image characteristics on aerial photographs and satellite imagery due to the transformation of pre-existing rocks under conditions of high temperature and pressure. These terrains are commonly associated with mountain belts, shields, and ancient crystalline regions, and their appearance on remote sensing data reflects structural complexity, mineralogical variations, and intense deformation. One of the most prominent image characteristics of metamorphic terrain is the presence of strong linear and curvilinear features. These lineaments correspond to foliations, schistosity, gneissic banding, shear zones, faults, and folds, which are typical structural elements produced during metamorphism. On satellite images, especially in medium to high spatial resolution data, these structures appear as aligned ridges, valleys, tonal streaks, or elongated drainage patterns. Texture is another important characteristic of metamorphic terrains. Due to the alternating bands of light and dark minerals in rocks such as gneiss and schist, these terrains often display a coarse to medium texture on images. The banded nature of gneissic rocks produces a streaky or striped appearance, particularly noticeable in panchromatic and false colour composite images. In contrast, massive metamorphic rocks like quartzite and marble may appear relatively smooth-textured compared to highly foliated schists. The degree of deformation and grain size influences the overall roughness
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