SSASSCAL ObservationNet
 HomeSonop InfosheetSonop Remote Sensing
 Sonop (S03) - Remote Sensing
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.
Satellite Image
Observatory Sonop (S03)
Info In the displayed image the observatory is given as a dotted rectangular box of 1km x 1km extension.
WRS2 Path-Row 177-73
Acquisition Date 24.04.2000
Image Details The observatory (black dotted rectangle) is located in a Kalahari sand dune landscape. The dunes are east-west orientated, about 20 meters high and covered by open tree savanna vegetation (red). The vegetation in the dune valleys is more open and thus displayed in greenish tones. Recent grazing impact and logged fields appear as white rectangles. Intense red rectangles indicate fields with standing crop. West and South-West of the observatory two vegetated calcrete pans appear as dark green “eyes”.
In general, the colours refer to the following land cover types:
  • 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.