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Image Data Purchase and Pre-processing

Image Data Purchase and Pre-processing. Litia Gaunavou SPC-SOPAC. Pre-Processing. Image Stitching Ortho-Correction Haze removal Atmospheric correction Pan-sharpening. Image Stitching. Stitched Image. Ortho Correction. Ortho correction requires a DTM

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Image Data Purchase and Pre-processing

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  1. Image Data Purchase and Pre-processing LitiaGaunavou SPC-SOPAC

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

  3. Image Stitching Stitched Image

  4. Ortho Correction • Ortho correction requires a DTM • the DTM should have similar scale as image data

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

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

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

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

  9. IHS Transformation • Intensity • Hue • Saturation

  10. IHS Transformation and Re-Transformation in ERDAS Imagine Red Intensity Red Green Hue Green Blue Saturation Blue

  11. Pan-Sharpening IHS Resolution Merge Panchromatic Image Data Red Red Intensity Resolution increase Green Green Hue Hue Blue Saturation Saturation Blue Normal Bands Pan-sharpened IMG

  12. Casuarina

  13. Casuarina Bands: 1, 2, 3, pan-sharpened natural colour combination

  14. Casuarina Bands: 2, 3, 4 pan-sharpened false colour infrared

  15. Casuarina Vegetation Index Bands: 4 – 3 / 4 + 3

  16. Radiometric Resolution Near IR 2 Red Coastal Green Yellow Near IR 1 Blue Red Edge

  17. BND 2, 3, 5 Natural C

  18. BND 3, 5, 7 FCIR

  19. BND 3, 5, 6 FCIR RE

  20. BND 3, 5, 8 FCIR (IR2)

  21. Current WV-2 Bundle Data Backdrop Products: • Pan-sharpened natural colour • Pan-sharpened false colour IR • Pan-sharpened false colour RE • Vegetation index red / near IR • Vegetation index red / RE

  22. Vinaka

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