THEOS: Thailand Earth Observation System

1
THEOS Thailand Earth Observation System

• Pakorn Apaphant, Ph.D.
• GISTDA, Thailand

2
Introduction

• The 1st EO Satellite of Thailand
• Main purpose for the countrys benefit
• Cooperation agreement between the government of
  Thailand and the government of France
• EADS Astrium was awarded a contract for THEOS
  system development

3
Introduction

• Contract signed on July 19, 2004
• Designed to work at operation level
• Expected to be launched in September 2007

4
Main Features

• Mass 750 kg.
• Orbit Sun Synchronous
• Altitude 822 km.
• Inclination 98.7
• Repeat Cycle 26 days
• Mean Local Time 10.00 a.m.
• Payload
• Panchromatic telescope
• Multi-spectral camera
• On-board Memory 51Gb
• Mission Data X-band Link
• TTC S-band Link
• Attitude Orbit Control and Orbit Determination
• 3-axis stabilized, Star Tracker, Gyro, GPS,
  Magnetic Torque, Sun Sensor
• Design Life Time 5 Years plus
• Expected Launch date Oct 2007

5
Payload
PAN MS Resolution 2 m 15 m Spectral
band P 0.45-0.90 µm Blue 0.45-0.52
µm Green 0.53-0.60 µm Red 0.62
0.69 µm NIR 0.77-0.90 µm Swath Width 22
km 90 km Off-nadir viewing 50 degree
50 degree
6
Imaging Capability

• The PAN telescope and MS camera with Roll axis
  maneuver capability
• Able to take image simultaneously within 1,000
  km. accessible corridor

7
Imaging Capability

• Able to take a single image mode simultaneously
  within 1,900 km. accessible corridor

8
Imaging Capability

• With pitch maneuver, stereo Imaging is then on
  service

9
THEOS Products

• Products levels
• Level 1A - Radiometric correction
• Level 2A - Radiometric and Geometric correction
  with UTM projection
• Level 2B Geometric correction with Ground
  Control Points and Map Projection
• Ortho Image - Geometric correction with DEM
• Pan-sharpened image
• Output Format DIMAP (GeoTIFF)
• Output Product CD/DVD

10
Scene Characteristics
PAN
MS Number of bands 1
4 Spatial resolution 2m
15 m Pixels per line
12000 6000 Number of lines
12000 6000 Image
Area (at nadir) 22 km x 24 km 84 km x 90
km Data volume (approx.) 144 Mbytes
36 Mbs/band
11
Development Progress

• Satellite Development and Ground Segment
  preparation have been well progressed as planned
• Satellite CDR has been performed in April 2006

12
Development Progress

• BUS units are mechanically and electrically
  integrated

13
Development Progress

• Payload Development
• PAN camera made from SiC
• Stability and light weight

14
Development Progress

• Payload Development
• PAN integration is successfully completed

15
Development Progress

• BUS and Panchromatic camera were coupled on June 8

16
CGS construction and installation
Sriracha, Chonburi
CGS system was installed on Jan 9, 2007
17
S Band Antenna installation
S-Band Antenna was installed on Jan 15, 2007
18
Data Policy

• To fulfill national needs and interests
• Operational Applications
• Security Information
• Capacity Building
• Geo-Spatial Business development
• International Interest and Benefits

19
Operational Applications

• Government Sector
• Natural Resources and Environmental Management
• Agriculture
• Crop Plantation, Crop yield forecasting
• Land Use and Land Cover
• Disaster related applications
• Preparedness, prediction, Mitigation, Assessment
• Country Security
• Map Updating

20
THEOS Data Supply
Value Added Image Image Intelligence
Image Data
Geospatial Information
Commercial Companies as VAP resellers and
Service Providers
Commercial Companies as SI and Geo spatial
service providers and consultants
21
International Needs and Interests

• International Ground Stations Data Distributors
• Multi Distribution Zones
• Research Coordination
• Service Providers
• Business Partnership

22
THEOS Global Orbit
23
System Operation Concept for International
Business
S/X-band Near Polar Station
X-band International Ground Stations
Zone Data Distributors
24
THEOS Operations and Services
HQ
CGS
IGS
Data Reception
S-band Station
Catalogue
CUDOS
Satellite Control Center
Data Recording/ Image Archive
Ordering/ Quotation
Image Ground Segment
Mission Planning Center
Order Tracking
USERS
Product Delivery
Invoice/ Billing
25
Data Access Policy

• Direct Reception
• 120 Mbps Downlink in X Band Frequency
• Ground Station Communication Cone
• Polar Station
• 50 GB On Board solid state Memory Recorder

26
Data Access Policy

• 10 minute per orbit in max for IGS
• 3.5 second per image scene
• Data Acquisition request is required
• Non Discrimination Basis

27
For Further Information pakorn_at_gistda.or.th Th
ank you