H. T. Wang* Chih-Tien Wang**

We develop the ortho-rectification model to correct the airborne SAR slant-range imagery. This model include estimation of flight parameters and ortho-rectification procedure. We estimated the flight parameters with the ground control points, both the slant range spacing and azimuth spacing are known. We rectified the SAR imagery with a given digital elevation model and the estimated flight parameters. Here we have considered the effects of layover and shadow, we checked the variation of slant range and look angle along the direction of slant range.

The tested data was taken over a mountainous area. The elevation within this area are about 350 m. We rectified the airborne SAR imagery with the digital elevation model data and 30 control points. The root mean square errors of slant range for ground control points and check points is about 6m. The resulting ground error is about 10m(1.5 pixels of slant range imagery) even in the mountainous area. The Paper is concluded by remarking on how to produce ortho SAR images which exhibit the phenomena of layover and shadow.

*Professor, Center for Spade and Remote Sensing Research, National Central University.

**Assistant Research Scientist, Center for Space and Remote Sensing Research, National Central University.

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