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Overview

Area of application

Process flowsheets

Detailed specifications

Examples

Example 1

Example 2

Example 3

Example 4

Example 5

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Example 4

Example of processing of the RADARSAT-1 SAR stereo pair for "Trieste" site.

As an example of processing of the RADARSAT-1 SAR stereo data the pair of images acquired over south Europian region was selected. It is an area of intersection of the three state borders: Austrian, Slovenian, and Italien. The Alps occupy the most part of scenes. In lower part of map — a part of Venetian bay, Adriatic sea.

 

The input scenes have been presented in SGF (SAR georeferenced) format. These are images in the ground path projection and with axes "radar slow time — ground range". The scenes were acquired in standard stripmap mode by S3 and S7 beams. The viewing geometry is shown on the figure below:

These images cover a surface area more than 10000 sq. km. Imaged terrain is mostly mountained and contains elevations up to 3000 m. Incidence angles on the scene center for the beams S3 and S7 are 34 and 47 degrees, so the difference of 12 degrees for the mountained relief provides the clear distinguished parallaxes. As the master image the scene S3 was selected. The images of processed stereo pair are shown on the picture below:

On the first stage, according to adopted methodology of processing, the co-registration of stereo images was performed. The goal of this operation is a spatial overlapping of images and the interesting subset selection.

The co-registration has been performed with use of ground tie points, which were set on the input images. Tie points have been selected over simple identified objects on the both images. The process was interactive and included the control of RMS errors, introduced by each tie point.

On the second stage — automatic digital matching  — the processing was performing with use of approach exploited adaptive correlation window. The window sizes on the each matching level and for each image point were selecting automatically. Other processing parameters (number of matching levels, search range boundaries, and compression factor for each particular level) were selecting by operator. They are shown below:

The step by step dynamic of output file generation during hierarchical matching is shown on the picture below:

 

The result of digital matching — parallaxes matrix expressed in gray levels and pseudo color presentation looks like following:

On the next stage the parallaxes file was geocoded (orthorectified), i.e. transformed with account of its own elevations into a normal projection on the geographic grid above the reference ellipsoid WGS84. Created raster presents the digital elevation map:

The perspective presentation of created elevations matrix and anaglyph picture of its part are shown below:

 

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Last modified: 10.10.2018© Racurs, 2004-2018