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The result is shown in Figure 11. In the resulting image no aliasing is visible. The resolution is improved by a factor of 
two, because structures up to 8 Ip/mm are resolvable. 
This laboratory experiment shows very simple and evidently the resolution enhancement by staggering. 
    
Figure 11. Resulting (staggered) image 
43 Airborne test with infrared sensor HSRS 
HSRS (Hot Spot Recognition Sensor) is a prototype of the IR sensor system on board the small satellite mission BIRD 
to be launched in 2001. The BIRD sensor system designed for high temperature event detection and evaluation consists 
of two IR sensors in the mid and thermal IR, respectively, together with a modified WAOSS camera (Oertel et al., 
1992). The HSRS Mercury Cadmium Telluride sensors are staggered lines of 2 x 512 pixels each (Skrbek, Lorenz, 
1998). With HSRS some airborne experiments have been carried out in order to check the system performance. 
Figures 12 and 13 show staggered and non-staggered images of one of those experiments. The aliasing in the non- 
staggered image is obvious. With staggering no aliasing occurs and a resolution improvement can be observed. 
Figure 12. Non-staggered HSRS image 
Figure 13. Staggered HSRS image 
  
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part Bl. Amsterdam 2000. 171