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Mapping without the sun
Zhang, Jixian

Figure 3: CDM SAR Change Detection
Map - Earthquake.
The Subsidence Map (SUB SAR ) provides information on
long-term surface displacement in urban areas and settlements.
Such vertical surface displacement may be caused e.g. by tec
tonics, subsurface mining, earthquakes. The resulting maps
can be used for risk diagnostics. The displacement is
calculated from image pairs using Differential Interferometric
SAR (DInSAR) or Persistent Scatterer Interferometric SAR
(PSInSAR). These are images of the same area observed
under a slightly different squint angle. TerraSAR-X can
acquire these image pairs with repeat pass interferometry with
a temporal off-set of 2.5 to 11 days depending on the
geographical location of the area of interest. The longest time
interval will be reached at the equator, the shortest the closer
the location is to the poles. The detectible difference in height
is related to the wavelength and thus in case of TerraS AR-X
is a fraction of approx. 3cm.
Figure 4: CDM SAR Change Detection
Map - Airfield.construction
Change Detection Map (CDM SAR ) can provide information
on long-term Land use/Land cover changes e.g. in surface
sealing and urban sprawl. Such information can be used e.g.
for urban/construction monitoring, urban planning appli
cations or topographic map updates. It is generated from
repeat pass interferometric image pairs over an area of interest
in which image coherence changes are detected. Changes are
mapped of a period of time long enough to be significant for
the phenomenon to be mapped, i.e. the period depends on the
mapping topic of interest and is defined by the customer. The
product is generated from StripMap or SpotLight images.
Image interpreters may get into analyzing capacity problems
e.g. in case of crises. Infoterra GmbH offers additional
products and services that can be adjusted according to
customers needs in order to support image interpreters during
peak work loads. For example, the customer can define the
depth and quality of the image interpretation of the ordered
Figure 5. Annotated dual polarisation SAR image.
Harbour of Duisburg, Germany
■ Clearly defined objects or infrastructure
characteristics are highlighted and (pre-) interpreted.
■ Interpretation keys could follow the NATO
Standardization Agreement ( STANAG) or others.
■ Legends and map styles are adjusted to customers
Thus, decision makers are relived from certain steps in the
image analysis process and will gain support for their
strategic decisions.
Other options for fast object extractions to create GIS layers
are: Line elements (e.g. roads, power transmission lines,
railways) through line detection and context evaluation or
single man-made objects (e.g. bridges, storage tanks, lattice
masts) through fast screening methods.
The TanDEM-X mission aims at generating a global Digital
Elevation Model (DEM) with an extremely high accuracy
corresponding to HRTI-3 specifications defined by the U.S.
National Geospatial-Intelligence Agency (NGA). This goal
will be achieved by means of a second SAR satellite
TanDEM-X flying in a combined orbit with TerraS AR-X.
Thus SAR image and DEM data will synchronously be
available for the same site.
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