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Ratelgat

Explanations for ETM-subsets

This image is a subset of a Landsat 7 ETM+ image, covering a size of about 30 km by 25 km, which was acquired during the rainy season. It is visualized as a so-called false colour composite. On the Red, Green and Blue channels the spectral bands 4: NIR (near Infrared), 5: MIR1 (Mid Infrared 1) and 3: visible red of the Landsat ETM+ sensor are displayed (RGB: 4-5-3).This band combination suits best for a detailed visualization of different land cover properties. Due to that, the displayed colours are not natural.

Details
Observatory	Ratelgat (S27)
Info	In the displayed image the observatory is given as a dotted rectangular box of 1km x 1km extension.
WRS2 Path-Row	176-82
Acquisition Date	26.10.2000
Image Details	The very sparsely vegetated quartz fields of the Knersvlakte appear in white and bright green tones. At the satellite image no vegetation difference is visible between the Goedehoop observatory (North-West) and Ratelgat (South-East). Vegetation at the mountains in the West is slightly denser (green). The dark patches at the North-Eastern edge are shadows from diffuse clouds (white).

• Dark Blue: Water bodies, dams and lakes without Algae.
• Light Blue: in populated places mainly buildings, outside of towns mainly rocks, and very sparsely vegetated soils.
• Red: Very dense and vital vegetation like bush thickets, forests or planted fields, in towns: gardens.
• Green: "middle dense" or less vital vegetation, like grass savanna (light green) and dry bush (dark green).
• White: bare soil or sparsely vegetated areas, independently from the natural soil colour, also gravel roads and pads.
• Intermediate colours are representing mixed pixels with information of several land cover types.