![Page 1: The potential use of theos satellite image for land use survey](https://reader035.vdocuments.us/reader035/viewer/2022062300/557558ffd8b42a40668b4a97/html5/thumbnails/1.jpg)
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
![Page 2: The potential use of theos satellite image for land use survey](https://reader035.vdocuments.us/reader035/viewer/2022062300/557558ffd8b42a40668b4a97/html5/thumbnails/2.jpg)
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
![Page 3: The potential use of theos satellite image for land use survey](https://reader035.vdocuments.us/reader035/viewer/2022062300/557558ffd8b42a40668b4a97/html5/thumbnails/3.jpg)
Land Use Analysis Division• Hard copy land use maps: 1974
• Digital land use maps: 2000
• Revise maps every two years
2006 2008
![Page 4: The potential use of theos satellite image for land use survey](https://reader035.vdocuments.us/reader035/viewer/2022062300/557558ffd8b42a40668b4a97/html5/thumbnails/4.jpg)
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
![Page 5: The potential use of theos satellite image for land use survey](https://reader035.vdocuments.us/reader035/viewer/2022062300/557558ffd8b42a40668b4a97/html5/thumbnails/5.jpg)
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
![Page 6: The potential use of theos satellite image for land use survey](https://reader035.vdocuments.us/reader035/viewer/2022062300/557558ffd8b42a40668b4a97/html5/thumbnails/6.jpg)
Study area• Southwest of Nongyai District, Chonburi Province
![Page 7: The potential use of theos satellite image for land use survey](https://reader035.vdocuments.us/reader035/viewer/2022062300/557558ffd8b42a40668b4a97/html5/thumbnails/7.jpg)
Data Preparation
Pre-process
•SPOT 5 : resolution 2.5 meters
▫January 12, 2007
•THEOS : resolution 15 meters
▫October 10, 2009
![Page 8: The potential use of theos satellite image for land use survey](https://reader035.vdocuments.us/reader035/viewer/2022062300/557558ffd8b42a40668b4a97/html5/thumbnails/8.jpg)
Data Preparation•Geometric correction : Image-to-image registration
SPOT THEOS
![Page 9: The potential use of theos satellite image for land use survey](https://reader035.vdocuments.us/reader035/viewer/2022062300/557558ffd8b42a40668b4a97/html5/thumbnails/9.jpg)
Data Preparation•Rescale SPOT image
2.5 meters
15 meters
![Page 10: The potential use of theos satellite image for land use survey](https://reader035.vdocuments.us/reader035/viewer/2022062300/557558ffd8b42a40668b4a97/html5/thumbnails/10.jpg)
Data Preparation
•Atmospheric correction:
Empirical Line
Calibration
▫Forces the remotely-
sensed data to match in
situ spectral reflectance
measurements (Jensen,
2005)
![Page 11: The potential use of theos satellite image for land use survey](https://reader035.vdocuments.us/reader035/viewer/2022062300/557558ffd8b42a40668b4a97/html5/thumbnails/11.jpg)
Change Detection
• Differencing Vegetation
Index Images
• Normalized Difference
Vegetation Index
▫ ∆NDVIij = NDVIij(date2) – NDVIij(date1)
• Increase/decrease
vegetation cover
DecreasDecreaseded
![Page 12: The potential use of theos satellite image for land use survey](https://reader035.vdocuments.us/reader035/viewer/2022062300/557558ffd8b42a40668b4a97/html5/thumbnails/12.jpg)
Field Survey•Overlay previous land use map, marked
polygons, THEOS image
•Field check: GPS, compass, other instruments
![Page 13: The potential use of theos satellite image for land use survey](https://reader035.vdocuments.us/reader035/viewer/2022062300/557558ffd8b42a40668b4a97/html5/thumbnails/13.jpg)
Result
• High classification accuracy of 81.25%
![Page 14: The potential use of theos satellite image for land use survey](https://reader035.vdocuments.us/reader035/viewer/2022062300/557558ffd8b42a40668b4a97/html5/thumbnails/14.jpg)
Land use change
• Perennial crop: Eucalyptus, Oil palm, Cashew
nut Young para rubber plantation, cropland
Eucalyptus
SPOT THEOS
Para rubber
Pineapple
![Page 15: The potential use of theos satellite image for land use survey](https://reader035.vdocuments.us/reader035/viewer/2022062300/557558ffd8b42a40668b4a97/html5/thumbnails/15.jpg)
Land use change
• Croplands: Sugarcane, Cassava, Pineapple
Young para rubber plantation
SPOT THEOS
Para rubber
Pineapple
Eucalyptus Poultry farm
![Page 16: The potential use of theos satellite image for land use survey](https://reader035.vdocuments.us/reader035/viewer/2022062300/557558ffd8b42a40668b4a97/html5/thumbnails/16.jpg)
Uncertainty•Mainly found in croplands•Different time of taking images
SPOT THEOS
Pineapple Pineapple
Sugarcane Sugarcane
![Page 17: The potential use of theos satellite image for land use survey](https://reader035.vdocuments.us/reader035/viewer/2022062300/557558ffd8b42a40668b4a97/html5/thumbnails/17.jpg)
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
![Page 18: The potential use of theos satellite image for land use survey](https://reader035.vdocuments.us/reader035/viewer/2022062300/557558ffd8b42a40668b4a97/html5/thumbnails/18.jpg)
Thank youThank you