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Presented in “China – Thailand Geo-Informatics Workshop Series I: Agricultural Applications” 30 June - 2 July 2010 at Pattaya, Thailand
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The Potential Use of The Potential Use of THEOS Satellite Image THEOS Satellite Image
for for Land Use SurveyLand Use Survey
China-Thailand Geo-Informatics Workshop Series I: Agricultural Applications
June 29, 2010
Chamaporn PaiboonvorachatLand Use Analysis Division
Land Use Analysis Division
• Land Development Department
• Ministry of Agriculture and Cooperatives
Main responsibility
• Analyze remotely-sensed data for land use
survey and mapping
• Provide land use maps for agricultural land
use planning
Land Use Analysis Division• Hard copy land use maps: 1974
• Digital land use maps: 2000
• Revise maps every two years
2006 2008
2010
Land Use Analysis Division 1
• Mapping in East & Northeast of Thailand
• Overlay previous land use maps on satellite
image
• Visual interpretation - Digitizing
Aerial photo/Satellite Image
Land Use 2008
Objective of the study
•To utilize THEOS image in
monitoring the changing areas
•To assess the accuracy of the
classified areas comparing to ground
truth
Study area• Southwest of Nongyai District, Chonburi Province
Data Preparation
Pre-process
•SPOT 5 : resolution 2.5 meters
▫January 12, 2007
•THEOS : resolution 15 meters
▫October 10, 2009
Data Preparation•Geometric correction : Image-to-image registration
SPOT THEOS
Data Preparation•Rescale SPOT image
2.5 meters
15 meters
Data Preparation
•Atmospheric correction:
Empirical Line
Calibration
▫Forces the remotely-
sensed data to match in
situ spectral reflectance
measurements (Jensen,
2005)
Change Detection
• Differencing Vegetation
Index Images
• Normalized Difference
Vegetation Index
▫ ∆NDVIij = NDVIij(date2) – NDVIij(date1)
• Increase/decrease
vegetation cover
DecreasDecreaseded
Field Survey•Overlay previous land use map, marked
polygons, THEOS image
•Field check: GPS, compass, other instruments
Result
• High classification accuracy of 81.25%
Land use change
• Perennial crop: Eucalyptus, Oil palm, Cashew
nut Young para rubber plantation, cropland
Eucalyptus
SPOT THEOS
Para rubber
Pineapple
Land use change
• Croplands: Sugarcane, Cassava, Pineapple
Young para rubber plantation
SPOT THEOS
Para rubber
Pineapple
Eucalyptus Poultry farm
Uncertainty•Mainly found in croplands•Different time of taking images
SPOT THEOS
Pineapple Pineapple
Sugarcane Sugarcane
Conclusion
•More than 80% correct classification
•THEOS image is useful for change detection
•Provide more efficiency in survey in limited
time
20112011
•THEOS images should be offered in Central
and Southern Regions of Thailand
Thank youThank you