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**Training samples — the foundation.** - Must be **homogeneous** areas of known class (land-use) type. - Ways to pick them: - **Fieldwork** (ground truthing with GPS). - **Aerial photography** at higher resolution than the sensor being classified. - **Existing maps / GIS layers.** - **Personal experience** / local knowledge. - Their **spectral characteristics** are then used to generate the class signatures.

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