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Due to the high ground resolution and height accuracy,
one can have the following products from the AeS-
System:
e Fully geocoded DEM's with following parameters:
- Grid of 0.25 m and height accuracy of 0.5 m
- Grid of 2.5 m and height accuracy of 0.1 m
« Fully geocoded SAR images, i.e. Orthoimages, with
following parameters:
- Grid of 0.25 m and a geometric distortion less than
0.5m
- Grid of 2.5 m and a geometric distortion less than
25m
e l'opographical maps in scale of 1:25,000 and larger;
- with contour lines having a spacing of 0.1 m and
larger.
e Transformation of SAR products into thematic and
topographic maps showing, for example, roads, urban
areas, or other area features on the scale of 1:25,000
and larger as well as printed and/or coded data for
specific subsequent treatment.
* Detailed measurement of the extent of local or area
flooding to assist in the avoidance and/or protection
from high water, representation of flood containment
areas as well as cartographic representation of other
environmental catastrophies and their chronological
development.
* Update of geographical, topographic, land use, or
other data banks and comparison between present and
historical (also optical) data.
* Classification and representation of land surface as
well as of vegetation and its change over time.
* Volume calculations of trash dumps, land fills, coal
heaps, and other such areas.
* Measurements of the flow velocity of rivers and canals
to an accuracy of 0.1 m/s with the along track
interferometry technique.
* Evaluation of optimum sites for telecommunication
stations
257
AeS-1 Swath Mode
Parameter A B C D E
Spatial Resolution (m) 0.5-2.0 0.5-2.0 0.5-2.0 0.5-2.0 0.5-2.0
Height Accuracy (m) 0.5 0.5 0.5 0.5 0,5
Swath Width (km) 1 3 4 7.4 14.8
Radiometric Resolution (dB) < 1.8 «1.8 « 1.8 < 1,8 < 1.8
Throughput of the Processing Chain (km?/day) 120 240 480 880 1760
Table 1. Main parameters of the AeS-1-System.
4. PRODUCTS 5. RESULTS
First results of the interferometric processor were
obtained by processing the interferometric data of the
E-SAR (Horn, 1994). The E-SAR, designed and
manufactured in DLR, is a research tool to elaborate
SAR related problems concerning both system
performance and data analysis. The instrument is
installed on board a DLR Dornier DO-228 aircraft. At the
present the radar is operational in P-, L-, C- and X-
bands with selectable vertical or horizontal
polarizations.
Fig. 1 shows a C-band image with 2 x 2 m resolution. A
small river and some trees can be seen very clear.
Fig. 2 shows a geocoded image with 3 x 3 m resolution.
The E-SAR flight measurement and the processing of
the slant range image were produced by DLR under
contract for the Remote Sensing Laboratories (RSL) of
the University of Zürich. The geocoding was then
performed by RSL. A topographic map in the scale
1:25.000 is now being derived from this image.
Fig. 3 shows the terrain modell of a trash dump in
Germany. The height accuracy was measured and is
better than 20 cm.
6. REFERENCES
G. Fornaro, G. Franceschetti, R. Lanari, ,Interferometric
SAR phase unwrapping using Green's formulation",
IEEE Transactions for Geosc. and Remote Sensing, to
be printed in May 1996.
R. Lanari et al., ,Generation of Digital Elevation Models
by using SIR-C/X-SAR Multifrequency Two-pass
Interferometry: the Etna Case Study“, [EEE
Transactions for Geosc. and Remote Sensing, to be
printed in September 1996.
R. Horn, ,DLR Airborne SAR Project, Objectives and
Status“, First Intern. Airborne Remote Sensing
Conference and Exhibition, Strasbourg, France, 11-15
September 1994.
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B2. Vienna 1996
