COMPARISON of THEOS and LANDSAT 5

A Comparison of THEOS and Landsat 5 Multi-Temporal-Imagery for Monitoring Rice in Thailand

Table of Contents

Chapter 1: Introduction1

Study Area5

The Aim Of Study6

Objectives of the study7

Chapter 2: Literature Review10

Introduction of Remote sensing10

The definition of Remote Sensing10

Component of remote sensing10

Concept of resolution11

1.Spatial resolution11

2.Spectral resolution11

3.Temporal resolution12

4.Radiometric resolutions13

Type of sensor for Earth observation satellite (Active and Passive sensor)13

The THEOS Satellite13

1) Payload and Bus13

Technical Details of THEOS Instruments18

THEOS Ground Segment19

Satellite Parameters19

LANDSAT-5 20

Cross comparison Satellite , Inter-sensor satellite comparison23

Approaches for Comparison and Evaluation of Satellites25

Geometric correction for comparison25

Atmospheric correction approach27

Comparison of basic features among the two sensor data30

Inter band correlation/band to band correlation30

Reflectance estimation30

Vegetation Indices especially NDVI31

Empirical relationship31

References32

Chapter 1: Introduction

Knowledge of the spatial information such as spatial distribution and geographical location are significant for production at various spatial scales. Analysis of remote sensing is effective tool for highlighting the agricultural features such as quality, quantity and types of crops from regional to local and global spatial scales. Satellite sensors has wide range of spatial resolution and temporal frequency, from high to lower resolution swath width.

THEOS satellite was launched on 1 October 2008 into a sun-synchronous orbit at an altitude of 822 km at the equator by Dnepr LV rocket from Dombarovsky, Yasny. It will circle the Earth in 101.4 minutes with an equatorial crossing at 10:00 am local time on the descending track (North to South) track completing a little more than 14 orbits per day.

THEOS has a design life of five years with a follow-on mission now in the planning stage. The satellite will transmit data to the THEOS Image Ground Segment (IGS) which will house the data reception and processing facilities. Command and control of the satellite will be provided by the THEOS Control Ground Segment (CGS) in Thailand.

The Astrium-on behalf of the Thai Space Agency THEOS (Geo-Informatics and Space Technology Development Agency) built optical Earth observation satellite to THEOS (Thailand Earth Observation System) on 6 August 2008 aboard a Dnepr rocket from the Russian Jasny launch into space. THEOS will swing in at a height of 820 km in the same orbit, the satellite is already on the SPOT-5 will orbit (Chander, 2009, pp.893-903).

THEOS remains the sole property of THEOS, which cares automatically to its operation in orbit. With the THEOS system in Thailand is soon over georeferenced image data to the entire planet and the required processing capacity for the various application areas of the system, such as cartography, land use planning and land use, monitoring of agricultural land, Forest Service, Coast Guard and management of flood risks. THEOS is in less than two days can provide current images to anywhere in Thailand.

The THEOS contract includes the production and the start of the optical satellites, the development of Erdsegments for its direct use and control of Thailand and the provision of modern archiving and image processing systems. Theos is based on the AstroSat family, Astrium's new generation of high-resolution optical Earth observation satellites, and benefit from the many years of relevant experience, which the manufacturer ...