Image Data Pre-processing for Pacific Island Countries
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![Page 1: Image Data Pre-processing for Pacific Island Countries](https://reader034.fdocuments.us/reader034/viewer/2022051620/5681355f550346895d9cc521/html5/thumbnails/1.jpg)
Image Data Pre-processingfor Pacific Island Countries
Litia Gaunavou
![Page 2: Image Data Pre-processing for Pacific Island Countries](https://reader034.fdocuments.us/reader034/viewer/2022051620/5681355f550346895d9cc521/html5/thumbnails/2.jpg)
Pre-Processing
• Image Mosaicing
• Haze removal
• Atmospheric correction
• Pan-sharpening
• Ortho-Correction
![Page 3: Image Data Pre-processing for Pacific Island Countries](https://reader034.fdocuments.us/reader034/viewer/2022051620/5681355f550346895d9cc521/html5/thumbnails/3.jpg)
Image Stitching
Stitched ImageImage Tiles
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Haze Removal
Raw LandSat 4 TM (Fiji – 1991) Haze Corrected LandSat 4 TM
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Atmospheric Correction
View Angle
DEM
Sensor type
Calibration data
Sun angle
![Page 6: Image Data Pre-processing for Pacific Island Countries](https://reader034.fdocuments.us/reader034/viewer/2022051620/5681355f550346895d9cc521/html5/thumbnails/6.jpg)
Corrected Image
Raw ALOS Image (Fiji 2007) ALOS Image + atmospheric correction
![Page 7: Image Data Pre-processing for Pacific Island Countries](https://reader034.fdocuments.us/reader034/viewer/2022051620/5681355f550346895d9cc521/html5/thumbnails/7.jpg)
Green, Red, Near Infrared
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Pan-Sharpening
Red
Green
Blue
PanchromaticImage Data
Blue
Green
RedIntensity
Hue
Saturation Saturation
Hue
Multi-spectral IMG Pan-sharpened IMG
IHS Resolution Merge
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Pan-SharpeningHyperspherical Color Space Resolution
Merge
WorldView-2: MS Data WorldView-2 PAN data
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Pansharpen_123 Pansharpen_234
Result
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Reasons for Bundle
• PanSharpen Natural Colour • PanSharpen False Colour Infrared• Multispectral available for Vegetation
Index• ATCOR can be performed• Orthorectification can be performed
![Page 12: Image Data Pre-processing for Pacific Island Countries](https://reader034.fdocuments.us/reader034/viewer/2022051620/5681355f550346895d9cc521/html5/thumbnails/12.jpg)
New Satellites, GeoEye-1 & WorldView-2
• High geo-accuracy ~ 5m1. Star tracker2. Advanced GPS position
• Ortho Correction required to activate high geo-accuracy
![Page 13: Image Data Pre-processing for Pacific Island Countries](https://reader034.fdocuments.us/reader034/viewer/2022051620/5681355f550346895d9cc521/html5/thumbnails/13.jpg)
Ortho Correction
• Orthocorrection requires a DTM• the DTM should have similar scale
as image data
![Page 14: Image Data Pre-processing for Pacific Island Countries](https://reader034.fdocuments.us/reader034/viewer/2022051620/5681355f550346895d9cc521/html5/thumbnails/14.jpg)
Vinaka!