The Multi-angle Imaging SpectroRadiometer (MISR) captured these views of the dust and sand that swept over northeast China on March 10, 2004. Information on the height of the dust and an indication of the probable dust source region are provided by these images, which include a natural-color snapshot from MISR’s nadir camera (left), a stereoscopically-retrieved height field (center) and a map of terrain elevation (right).
The dust appears in the natural-color image as the pale brownish ripples that traverse the image from Inner Mongolia toward the southeast, over Beijing, Liaoning and Jilin Provinces. MISR’s stereoscopic feature matching algorithm retrieves height above the surface where there is sufficient spatial contrast between several view angles. When the stereo matcher determines that a location is not covered by a feature above the surface, the terrain elevation data are displayed instead. The surface elevation map at right shows that the eastern portion of the image area, Liaonang and Jilin Provinces, is mostly low, flat terrain. These are the areas where the dust appears to be thickest and where the stereo height field indicates that the tops of the dust attain heights of up to about 1500 meters above the surface terrain. Clouds are situated between about 1 and 4 kilometers above the surface. The retrieved heights shown here are uncorrected for wind effects. The square-shaped area near the center of the stereo map is an artifact of the data processing. Areas where height could not be retrieved are shown in dark grey.
The Multiangle Imaging SpectroRadiometer observes the daylit Earth continuously and every 9 days views the entire globe between 82° north and 82° south latitude. The MISR Browse Image Viewer provides access to
low-resolution true-color versions of these images. These data products were generated from a portion of the imagery acquired during Terra orbit 22481. The panels cover an area of 380 kilometers x 685 kilometers, and utilize data from blocks 54 to 58 within World Reference System-2 path 121.
Image courtesy NASA/GSFC/LaRC/JPL, MISR Team. Text by Clare Averill (Raytheon/JPL).
This pair of Multi-angle Imaging SpectroRadiometer images, acquired 16 days apart, covers the Liaoning region of China and parts of northern and western Korea. They contrast a relatively clear day (March 23, 2002) with one in which the skies were extremely dusty (April 8, 2002). In the later view (right-hand image), the dust obscures most of the surface, although the Liaodong Peninsula extending between the Bo Hai Sea and Korea Bay is faintly visible at the lower left. Wave features are apparent within the dust layer.