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Advanced Image Data Pre-Processing Techniques for Pacific Island Countries

This document outlines comprehensive image data pre-processing techniques employed in Pacific Island countries, focusing on enhancing remote sensing imagery. Key processes include image mosaicing, haze removal, atmospheric correction, and pan-sharpening. Techniques such as ortho-correction and image stitching are detailed to improve image quality and ensure high geo-accuracy. The integration of various satellite data, including LandSat and ALOS images, showcases the advancement of imaging technology and methodologies. The document emphasizes the significance of accurate atmospheric corrections and the use of Digital Terrain Models (DTMs) for optimal image analysis.

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Advanced Image Data Pre-Processing Techniques for Pacific Island Countries

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  1. Image Data Pre-processingfor Pacific Island Countries LitiaGaunavou

  2. Pre-Processing • Image Mosaicing • Haze removal • Atmospheric correction • Pan-sharpening • Ortho-Correction

  3. Image Stitching Stitched Image Image Tiles

  4. Haze Removal Raw LandSat 4 TM (Fiji – 1991) Haze Corrected LandSat 4 TM

  5. Atmospheric Correction • View Angle • DEM • Sensor type • Calibration data • Sun angle

  6. Corrected Image Raw ALOS Image (Fiji 2007) ALOS Image + atmospheric correction

  7. Green, Red, Near Infrared

  8. Pan-Sharpening IHS Resolution Merge Panchromatic Image Data Red Intensity Red Green Hue Hue Green Saturation Saturation Blue Blue Multi-spectral IMG Pan-sharpened IMG

  9. Pan-Sharpening HypersphericalColor Space Resolution Merge WorldView-2 PAN data WorldView-2: MS Data

  10. Result Pansharpen_123 Pansharpen_234

  11. Reasons for Bundle • PanSharpen Natural Colour • PanSharpen False Colour Infrared • Multispectral available for Vegetation Index • ATCOR can be performed • Orthorectification can be performed

  12. New Satellites, GeoEye-1 & WorldView-2 • High geo-accuracy ~ 5m • Star tracker • Advanced GPS position • Ortho Correction required to activate high geo-accuracy

  13. Ortho Correction • Orthocorrection requires a DTM • the DTM should have similar scale as image data

  14. Vinaka!

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