1. CEOS WGISS – 25 February 25-29, 2008 Sanya, Hainan Island, China Geo-Informatics and Space Technology Development Agency (GISTDA) THEOS / Land Surface Imaging Suwan Vongvivatanakij THEOS Engineer phuriwaj@gistda.or.th

2. Geo-Informatics and Space Technology Development Agency (GISTDA) Content THEOS Introduction Satellite Performance THEOS Imaging Acquisition Type Geometrical Conditions Gains & Compression THEOS Current Status THEOS Future Service

3. Geo-Informatics and Space Technology Development Agency (GISTDA) Content THEOS Introduction Satellite Performance THEOS Imaging Acquisition Type Geometrical Conditions Gains & Compression THEOS Current Status THEOS Future Service

4. Geo-Informatics and Space Technology Development Agency (GISTDA) THEOS Satellite: Bus Total mass750 kg Dimensions2.1 x 2.1 x 2.4 m Solar array800 W Nominal Lifetime> 5 years Hydrazine80 kg Recording capacity40 Gbit solid-state memory Image Telemetry120 Mbit/sec (X band) Off-nadir viewing+/- 50º (roll and pitch) Attitude control Earth pointing and high agility Orbit determinationGPS

5. Geo-Informatics and Space Technology Development Agency (GISTDA) THEOS Satellite : Payload PANMS Resolution (m) / Imaging swath (km) 2 / 2215 / 90 Spectral ranges (um)0.45 – 0.90B1 (Blue): 0.45-0.52 B2 (Green): 0.53-0.60 B3 (Red): 0.62-0.69 B4 (NIR): 0.77-0.90 Signal to Noise Ratio> 90>100 Imaging dynamics 8 bits among 12 bits Absolute localizations accuracy (level 1B) < 300 m Onboard image processing 2.8 or 3.7 compression ratio (DCT) Optical Payload Panchromatic Camera Multispectral Camera

6. Geo-Informatics and Space Technology Development Agency (GISTDA) THEOS Performance Orbit TypeCircular SSO low earth orbit Altitude822 km No of Orbits per Day14+5/26 orbits per day Local Equator Crossing Time 10:00 am (descending) Orbit Period101 minutes Orbit Inclination98.7° Orbit Cycle26 days (369 orbits) Distance Between Passes (at Equator) 108 km (Between 2 closest passes) 2800 km (Between 2 consecutive passes) Coverage AreaRadius more than 2000 km from Ground Station

7. Geo-Informatics and Space Technology Development Agency (GISTDA) Coverage Area

8. Geo-Informatics and Space Technology Development Agency (GISTDA) Content THEOS Introduction Satellite Performance THEOS Imaging Acquisition Type Geometrical Conditions Gains & Compression THEOS Current Status THEOS Future Service

9. Geo-Informatics and Space Technology Development Agency (GISTDA) Acquisition Type THEOS System allows 2 different missions. Panchromatic, high resolution rather small FOV Multispectral, medium resolution with large FOV Panchromatic Class of Quickbird to Formosat 2 (10 to 20 km swath) More dedicated to cartography, local land use, monitoring and security Multispectral Class of Spot, Landsat, IRS (>60 km swath) More dedicated to agriculture, forestry, natural resources and management

10. Geo-Informatics and Space Technology Development Agency (GISTDA) PAN Sharpening Image PAN MS PAN Sharpening =

11. Geo-Informatics and Space Technology Development Agency (GISTDA) Geometrical Conditions 3 different domains of pointing Nadir (pointing angle <12° from nadir) Nominal (up to 30° from nadir) Full (up to 50° in roll and 45° in pitch) Nadir condition At 30° roll, the effective resolution is about 2.4 x 2.6 meters. Recommended for the acquisitions on cities or when the highest resolution is required. Outside nominal condition Pixel size is increased by a factor 3 across track and 1.7 along track. Geometrical degradation: with roll angle of 50° Especially useful for emergency cases

12. Geo-Informatics and Space Technology Development Agency (GISTDA) Accessibility Performance 5 days full accessibility performance with 30° roll angle 1 st day 2 consecutive days 3 consecutive days 4 consecutive days 5 consecutive days

13. Geo-Informatics and Space Technology Development Agency (GISTDA) Accessibility Performance 2 days full accessibility performance with 50° roll angle no access of on 1 st day access on 1 st day access on 2 nd day Double access over 2 day 1 st day 2 consecutive days

14. Geo-Informatics and Space Technology Development Agency (GISTDA) Geometrical Conditions With up to 50° roll, the accessibility is better than 1 day for 90% of the earth. High pitch is to be able to take several images of the same area in one pass. Stereo Image

15. Geo-Informatics and Space Technology Development Agency (GISTDA) Gains THEOS images are coded on 8 bits. Capability to choose these 8 bits among the 12 bits available after the Analog to Digital Converter. 2 analogue gains with a factor 2 between each 5 digital gains with a factor 2 between each This gives 10 different gains. The transmitted bits are in white.

16. Geo-Informatics and Space Technology Development Agency (GISTDA) Compression On-board compression allows for 2 different compression ratio: High 3.8 Low 2.8 High compression ratio give good image quality for all the THEOS images. Low compression ratio is suitable for complex contents such as urban areas MS images for agricultural application usually need good signal to noise ratio with low compression ratio

17. Geo-Informatics and Space Technology Development Agency (GISTDA) Content THEOS Introduction Satellite Performance THEOS Imaging Acquisition Type Geometrical Conditions Gains & Compression THEOS Current Status THEOS Future Service

18. Geo-Informatics and Space Technology Development Agency (GISTDA) Satellite The satellite is fully integrated and all the tests results confirmed that the satellite is compliance with the specifications. Flight Aptitude Review was considered as closed. Satellite was ship to launch site (Yasny, Russia) Now, Satellite is in storage and ready for launch.

19. Geo-Informatics and Space Technology Development Agency (GISTDA) Ground Segment The infrastructure which consisted of Control Ground Segment and Image Ground Segment have been well prepared. Both hardware and software are installed and tested successfully. On-Site Training: Flight Operation Team have been qualified with their back up. Siracha, Chonburi Province Thailand

20. Geo-Informatics and Space Technology Development Agency (GISTDA) Launcher The Dnepr launcher is being integrated. Final Acceptance of launch base infrastructure was ready to start launch campaign activities.

21. Geo-Informatics and Space Technology Development Agency (GISTDA) Launch Campaign The schedule depends on the drop zone authorization which is subject to the political and intergovernmental agreement between Russia and Uzbekistan.

22. Geo-Informatics and Space Technology Development Agency (GISTDA) Content THEOS Introduction Satellite Performance THEOS Imaging Acquisition Type Geometrical Conditions Gains & Compression THEOS Current Status THEOS Future Service

23. Geo-Informatics and Space Technology Development Agency (GISTDA) THEOS GeoPortal Browse and request satellite images from the catalogue through web interface Keep track of ordering and production status by user account Delivery products to customer through FTP

24. Geo-Informatics and Space Technology Development Agency (GISTDA) Conclusion Monitor and Support the exploitation of resources & other disciplines with the advantage of High Resolution and Large Swath Width, Frequent Time visit High Agility with 2 pushbroom scanning optical instruments Large visibility circle covering Main Part of Asia Satellite, Ground, Launcher are ready and expected to be launched soon. Quick and easy service with browsing, ordering, tracking and delivery by THEOS GeoPortal