By Ramon F. Hanssen
This booklet is the made from 5 and a part years of analysis devoted to the und- status of radar interferometry, a comparatively new space-geodetic strategy for m- suring the earth’s topography and its deformation. the most cause of venture this paintings, early 1995, used to be the truth that this method proved to be super helpful for wide-scale, fine-resolution deformation measurements. in particular the interf- ometric items from the ERS-1 satellite tv for pc supplied appealing first results—several interferometric photographs seemed as highlights at the disguise of journals akin to Nature and technology. Accuracies of some millimeters within the radar line of sight have been claimed in semi-continuous picture info got globally, without reference to cloud disguise or sun illumination. regrettably, as a result of the relative loss of supportive observations at those resolutions and accuracies, validation of the precision and reliability of the implications remained a subject matter of shock. From a geodetic perspective, a number of survey strategies are quite often on hand to degree a selected geophysical phenomenon. To make an optimum selection among those ideas it is very important have a uniform and quantitative method for describing the blunders and the way those error propagate to the envisioned parameters. during this context, the examine defined during this booklet was once initiated. It describes matters concerned with kinds of blunders, brought on by way of the sensor, the information processing, satellite tv for pc positioning accuracy, atmospheric propagation, and scattering personality- tics. however, because the first merchandise within the subtitle “Data Interpretation and mistake research” indicates, info interpretation isn't regularly straightforward.
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Extra info for Radar Interferometry: Data Interpretation and Error Analysis
Hence, the scattered signal is directed away from the radar (Raney, 1998). 1 43 Image selection Image selection is perhaps one of the most vital decisions in the application of radar interferometry, assuming that several SAR acquisitions are available. The criteria depend on the specific application of the study. Main decisions regard the type of sensor, the availability of the data, the temporal and spatial distribution of the baselines, and the characteristics of the terrain and atmosphere during the image acquisitions.
Especially data from the ERS-1/2 “tandem mission” are currently used for these purposes (van der Kooij, 1999a). Due to the regular acquisitions of the ERS satellites, aimed at full coverage of the world, mosaicing of many interferometric elevation models enables the mapping of large areas, up to continental scales. Main applications of the elevation models include telecommunication, hydrological mapping and flooding predictions, cartography, and geophysics. The availability of topographic maps (status 1997) is shown in fig.
5 Interferometric processing overview This section gives an overview of the sequence of most important decisions and processing steps to create interferograms and geocoded products from SAR data. The interferometric processing can start with focused complex SAR data, sometimes referred to as Single-Look Complex (SLC) data, which may be available as a product from the agency exploiting the satellite. Nevertheless, raw (unfocused) SAR data are often preferred over SLC data, since they are usually cheaper, can be delivered faster, and exclude the possibility of different focusing strategies at the various processing facilities.