High Resolution 1:10,000 scale Mapping Strategy of Multi ... - NDMA

� Some sensors do have only a limited radiometric calibration and improvement
of the delivered images, visible in a striping effect. The human eye is very
sensitive for this. By a simple shift of the grey values by half the mean
difference of neighbored lines the effect can be removed.
� Direct Sensor Orientation- The satellites are equipped with a positioning
system like GPS, gyroscopes and star sensors. So without control points the
geo-location can be determined with accuracies depending upon the system.
For example IKONOS can determine the imaged positions with a standard
deviation of approximately 4m.
� Often more problems do exist with not well known national datum.
DATA PROCESSING IN SATELLITE MAPPING
The quality of remote sensing data consists of its spatial, spectral, radiometric and
temporal resolutions.
SN RESOLUTION DESCRIPTION
1
Spatial
resolution
The size of a pixel that is recorded in a raster image
typically pixels may correspond to square areas
ranging in side length from 1 to 1,000 meters (3.3 to
3,300 ft).
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