1. Page 1 ENVISAT Press Day - ESTEC, 1 February 2001 Fabio Rocca Dipartimento di Elettronica e Informazione Politecnico di Milano Envisat for the physics of the land surfaces

2. Page 2 ENVISAT Press Day - ESTEC, 1 February 2001 ASAR, the Advanced Synthetic Aperture Radar has new powerful capabilities: - electronically steered antenna - accessibility to a ~4 times wider swath and thus faster revisiting times - incidence angle range: 15 - 45 degrees - alternating polarization mode - solid state memory It will continue the sequence of C band images taken by ERS 1 - 2 since 1992.

3. Page 3 ENVISAT Press Day - ESTEC, 1 February 2001 Multiswath illumination

4. Page 4 ENVISAT Press Day - ESTEC, 1 February 2001 Single SAR image Multiple SAR image

5. Page 5 ENVISAT Press Day - ESTEC, 1 February 2001 OPTICAL Multiple SAR image

6. Page 6 ENVISAT Press Day - ESTEC, 1 February 2001 An area of Milano (~2,5x2,5 kmq)

7. Page 7 ENVISAT Press Day - ESTEC, 1 February 2001

8. Page 8 ENVISAT Press Day - ESTEC, 1 February 2001 ERS-1 + SPOT Flooding: Mississipi river during Summer 1993

9. Page 9 ENVISAT Press Day - ESTEC, 1 February 2001 Elongation Radar Backscatter Sowing Tillering Floweirng Vegetative phase Reproductive phase 2 ) Tillering 3 ) Elongation 1 ) Sowing

10. Page 10 ENVISAT Press Day - ESTEC, 1 February 2001 Java Map of rice fields derived multitemporal ERS-1 data. Semarang, Java, (Cyan: late rice Magenta: early rice Yellow: non rice)

11. Page 11 ENVISAT Press Day - ESTEC, 1 February 2001 1 Alternating Polarisation modes Left: HH-HV sub-mode Right: HH-VV sub-mode

12. Page 12 ENVISAT Press Day - ESTEC, 1 February 2001 IGN mapSPOT XS image ERS tandem coherence before the storm ERS tandem coherence after the storm Damages estimate (coherence gradient in pink tones) Based on Spot Image coherence products SERTIT Deforestation damage analysis

13. Page 13 ENVISAT Press Day - ESTEC, 1 February 2001 SAR interferometry in Iceland: Vatnajokull eruption

14. Page 14 ENVISAT Press Day - ESTEC, 1 February 2001 USGS SAR interferometry in Alaska Volcano inflation during the eruption.

15. Page 15 ENVISAT Press Day - ESTEC, 1 February 2001 Full resolution IM/IM Optimized IM/WSM Differential Interferometry: coseismic motion of Landers Earthquake

16. Page 16 ENVISAT Press Day - ESTEC, 1 February 2001 Courtesy of CCRS Radarsat interferometry:ice velocity in Antarctica

17. Page 17 ENVISAT Press Day - ESTEC, 1 February 2001 Interferometric motion analysis 27/9/95-12/9/96 Gepatsch Reservoir Ötztal Alps

18. Page 18 ENVISAT Press Day - ESTEC, 1 February 2001

19. Page 19 ENVISAT Press Day - ESTEC, 1 February 2001 Bachu (China) DEM with 10 m vertical precision are achievable; courtesy of DLR Digital elevation models

20. Page 20 ENVISAT Press Day - ESTEC, 1 February 2001 Terrain Motion in L.A., USA: 1992 - today

21. Page 21 ENVISAT Press Day - ESTEC, 1 February 2001 Paris: terrain motion 1992-today

22. Page 22 ENVISAT Press Day - ESTEC, 1 February 2001 Paris: La Villette Science Museum Correlation between building thermal dilation from SAR data and temperatures at the acquisitions times. RMSE = 1.1 mm

23. Page 23 ENVISAT Press Day - ESTEC, 1 February 2001 Page29 ENVISAT Press Day - ESTEC, 1 February 2001 T.R.E. Detecting a crack in a building from space

24. Page 24 ENVISAT Press Day - ESTEC, 1 February 2001 Conclusions ASAR is an invaluable tool for earth observations. Its principal applications will be: - agricultural, forest, and soil moisture monitoring - detecting land use changes - responding to natural hazards - geological exploration - topographic mapping - surface deformation measurements