1. Introduction
An operational earth observation, optical sensors have proven an efficient tool for many applications. Imagery acquired by them offer various wavelengths and reveal specific information about ground features. Applications of satellite remote sensing have been accomplished in several fields. The Geo-Informatics and Space Technology Development Agency use satellite data for the project. Multi-sensory data provides complementary information about scene. In consequence, image fusion improves the interpretability of the images, recently, higher quality satellite images are available than ever.

2. Study area

Fig. 1. Chiang Mai area in northern of Thailand.
2. Data Used

2.1 Satellite Data

SPOT-1 Panchromatic	1988
LANDSAT-5/TM		1988
LANDSAT-7/ETM	 	2002
IRS-1D Panchromatic		2002

Table 1. Landsat-5/ 7 image

Band	Spectral range(mm)	Resolution(m)
3	0.63-0.69	30
4	0.75-0.90	30
5	1.55-1.75	30

Fig. 2. Landsat image color composite 453:RGB, 30m resolution.
Table 2. SPOT-1 image

Band	Spectral range(mm)	Resolution(m)
Pan	0.51-0.73	10

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