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• display of SRF header and footer information, and of
data values around a specified point,
• creation of histograms and statistics for SRFs as well
as for shapefiles.
7.4 Data Visualization
The data can also be visualized. The following functionalities
lie at hand:
• creation of color shaded DEM models from given
SRFs,
• creation of DEM models from given SRFs,
• visualization of information contained in shapefiles.
7.5 Information Fusion and Mosaicking
Information fusion in our case means the combination of
evidences contained in different layers for the same area,
whereas mosaicking is understood as the process of producing a
dataset for a wider area from sources not intersecting each other.
Information fusion has to be differentiated into fusion between
raster and vector data and fusion of information contained in
vector data, and fusion between raster file layers. The latter is
implemened as documented in (Knopfle et al., 1998).
7.6 Resampling
There are functions for the calculation of cartographic
transformations for Sun Raster Files. They have to be adopted
to work on shapefiles as well. These functions not only invoke a
resampling process but also lead to a re-projection of the values
onto a different coordinate system.
8. CONCLUSIONS
The design of a scalable database for Digital Elevation Models
has been shown. The concept for efficiently holding and
accessing the data has been discussed. The data types supported
at the moment have been presented. An overview of the datasets
currently held in the database has been given. With this
background algorithms that already have been implemented or
which have to be implemented have been discussed.
The performance of the algorithms in preparation and support
of the TanDEM-X Mosaicking and Calibration Processor has to
be shown.
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