3. About Chelys About Chelys About Chelys Software development and integration for the space sector since 1996 Service provider for some of the most important space agencies (ESA, Eumetsat) Multi-mission systems, quality control, image processing and cataloguing of satellite data

4. SRRS SRRS Processing high resolution data requires a high resource usage In the ground segment the processing of HR data is usually on-request Only data at low resolution or a small part of those in high resolution are processed systematically Processing high resolution data requires a high resource usage In the ground segment the processing of HR data is usually on-request Only data at low resolution or a small part of those in high resolution are processed systematically We have developed an architecture, SRRS – Satellite Rapid Response System able to start from raw data (level0), that in general is available just a few seconds after being downloaded from the satellite. We have developed an architecture, SRRS – Satellite Rapid Response System able to start from raw data (level0), that in general is available just a few seconds after being downloaded from the satellite.

5. SRRS Architecture Distributed architecture with a central catalogue and a data driven processing system SRRS SRRS

6. SRRS Data Flows Three main data flows: processing, consultation and on-request ordering SRRS SRRS

7. ALOS/AVNIR ALOS/AVNIR WEB Interface

8. ALOS/AVNIR ALOS/AVNIR WEB Interface

9. Hardware SRRS SRRS Scalable in terms of processing power Each subsystem runs on a separate blade Reliable and fault tolerant SRRS Hardware Architecture SRRS Hardware Architecture In order to get the most out of the system design, weve moved onto blade systems: No internal storage. An external SAN is in charge of managing the storage combining scalability and performance

10. ALOS/AVNIR2 ALOS/AVNIR2 AVNIR2 represented a new challenge as we wanted to work on a sensor with a much higher resolution than MERIS.

11. ALOS/AVNIR2 ALOS/AVNIR2 Now we are going to present the results: Raw Data Image Processor (a new processing system that can be added to the existing SRRS infrastructure) Instrument Process Facility (IPF) Both systems start from the raw data relative to the AVNIR2 bands and from the Telemetry. The first system performs quality control and true color image generation, the other is a true IPF made to generate products.

12. Images When we started to develop the image processor we found that the model used to generate MERIS images was not sophisticated enough to generate realistic images using an instrument with a resolution as high as AVNIRs. ALOS/AVNIR2 ALOS/AVNIR2 AVNIR2 Image Processor AVNIR2 Image Processor Thats why we have implemented the reflectance calculation with the atmospheric correction.

13. Images These adjustments are important in producing accurate band ratio indexes. The system provides progressive, cumulative adjustments: ALOS/AVNIR2 ALOS/AVNIR2 Calculation of Reflectance Calculation of Reflectance First it applies sensor gain and offset values to convert raw image value to calibrated radiance Then it uses the solar elevation angle to compute the TOA reflectance Next, it corrects the TOA values for the additive (band dependent) effects of atmospheric path reflectance (haze) Then path reflectance values are computed empirically from band histograms Finally it corrects for (band dependent) atmospheric attenuation (absorption) effects to compute the scaled reflectance of the surface materials

14. Images Now we will show you the images prior to correction and how we were able to improve them. ALOS/AVNIR2 ALOS/AVNIR2 Raw Data Image Calibrated Radiance after the radiometric correction Scaled Reflectance with atmospheric correction

15. IPF ALOS/AVNIR2 ALOS/AVNIR2 AVNIR2 Instrument Process Facility AVNIR2 Instrument Process Facility While we were developing the image processor, we began to assemble the IPF. simplified model for calculating reflectance not sufficient accurate reflectance crucial for generation of realistic images simplified model for calculating reflectance not sufficient accurate reflectance crucial for generation of realistic images To reduce the reflectance calculation errors, radiance needs to be very precise. Our IPF today generates radiances identical on a binary level to those of the reference IPF.

16. IPF ALOS/AVNIR2 ALOS/AVNIR2 AVNIR2 Instrument Process Facility AVNIR2 Instrument Process Facility IPF can generate the following products: Level1A generation from raw data IPF is able to process from raw data up to a Level1B scene in less than 30 seconds. Processing can be performed: by scene (nominal) in stripline mode Processing can be performed: by scene (nominal) in stripline mode Level1B generation from Level1A Level2 generation from Level1B (under validation)