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Ogongo

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	Ogongo (S42)
Info	In the displayed image the observatory is given as a dotted rectangular box of 1km x 1km extension.
WRS2 Path-Row	180-72
Acquisition Date	22.04.2003
Image Details	The North Central region of Namibia is under high land use pressure. The entire region is covered by dispersed settlements and crop fields (small bright green patches). Only in the Ogongo Research Station, where the right observatory is located, the original Mopane woodland was conserved (closed dark brown region). The entire region is temporally affected by flooding along the Oshana aquifer systems, which are on this image either covered by dense grass and herb cover (bright green) or are flooded (blue grey patches).

• 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.