Full text: Mapping without the sun

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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