Description of the DIAPASON software developped by CNES current
and future applications
| Didier Massonnet, Frederic Adragna
||Space Image Quality and Processing Division, Centre National d'Etudes Spatiales, 18, avenue Edouard Belin, 31055 Toulouse Cedex, phone: (33) 18.104.22.168 / (33) 22.214.171.124, fax : (33) 126.96.36.199
Didier.Massonnet@cst.cnes.fr, Frederic Adragna@cst.cnes.fr
SAR interferometry has demonstrated its capability to produce
large scale digital elevation models or to detect small moves
of various origins, such as surface deformation produced by large
earthquakes, landslide, subsidence, smaller earthquakes or fault
slip as small as 2 cm. More studies detected glaciers movements
or phase surface changes.
CNES engaged itself in an effort to give interferometry a scientific
and operational status which requires a lot of activity along
- The precise understanding and quantification of the phenomena
involved in the interferometric measurement
- The assessment of the extent and the gravity of coherence
losses, which is critical for interferometric applications assessment
and scene selection.
- This have been made possible by an in-depth analysis of a
large amount of data, that in turn, demands the availability of
an almost fully operational interferometric processing chain.
Such a tool (called DIAPASON) has been developed at CNES and processed
more than one million square kilometres of interferograms and
spotted interesting phenomena: landslide, earthquake, volcano
atmospheric propagation errors, ...
New applications may be much more demanding in terms of scene
length and calibration accuracy.
An example where interferometry would be pushed forward in terms
of performance is the measurement of local tidal loads on Earth's
crust, caused by ocean tides. We plan to study the effect of such
a loading. For this purpose we should be able to study a 600 km
long scene for the detection of centimetre sized phenomena.
Last results over recent earthquakes and atmospheric artifacts
detection will be shown.
Keywords: ESA European
Space Agency - Agence spatiale europeenne,
observation de la terre, earth observation,
satellite remote sensing,
teledetection, geophysique, altimetrie, radar,
chimique atmospherique, geophysics, altimetry, radar,