Wim van Rossum 
  
is an Figure I. Example of a fully polarimetric PHARUS image of Amsterdam and Schiphol. The colors are assigned in the 
itary, following way: HH channel to red, HV+VH to green and VV to blue. 
f data | 
RUS 
The applications for which data have been acquired and analyzed are e.g. land use classification, cartography, road 
array detection, ocean bottom topography, detection of ships and ship wakes, (moving) target detection, crop classification 
odes, and forestry applications. For these applications the 
light capability of PHARUS to obtain fully polarimetric 
Pass images with a high resolution is extensively used. 
Overall, most applications could be carried out 
successfully. 
ng of 
tenna For example land use could be classified into six 
[SAT classes: water, urban, forest, grass, bare soil and moor. 
Shown in Figure 2 is the Heerde test site near Enschede 
(the Netherlands) which has been classified in five 
classes (no moor has been found in this region). The 
river dividing the figure is the IJssel, the urban area is 
the village of Olst. The dominating light areas are 
XAR) classified as grass, the darker areas without texture are 
atory classified as bare soil, the darker areas with texture as 
logy forest. The intensity of the colors in the original image 
lands are scaled with the backscatter intensity of the SAR 
nany image, adding details to the figure which are not seen in 
on II the classified image by itself. 
Another exampie: for road detection a PHARUS image 
| and has been compared to a road graph file. The shift 
t the between the road file and the PHARUS image could for 
) and the greatest part be attributed to the inaccuracy of the 
ty of road graph file. 
d the 
1 VV 
  
Figure 2. A classified image of the Heerde test area. 
More advanced SAR applications require both high resolution and the flexibility that is offered only by phased array 
SAR systems. The PHARUS system, since it has an active array, which is fully programmable in its operating modes, 
allows investigations of these applications. Advanced SAR modes that are being investigated are: (sliding) spotlight 
SAR and interferometric SAR (both along- and across-track).. In the following sections the investigation into these 
advanced applications will be discussed. The use of PHARUS as an test bed for ASAR data will also be shown. 
  
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part Bl. Amsterdam 2000. 341