Image Data Purchase and Pre-processing Litia Gaunavou SPC-SOPAC.

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Presentation transcript:

Image Data Purchase and Pre-processing Litia Gaunavou SPC-SOPAC

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

Image Stitching Stitched Image

Ortho Correction Ortho correction requires a DTMOrtho correction requires a DTM the DTM should have similar scale as image datathe DTM should have similar scale as image data

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

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

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

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

IHS Transformation Intensity Intensity Hue Hue Saturation Saturation Intensity Intensity Hue Hue Saturation Saturation

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

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

Casuarina

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

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

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

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

BND 2, 3, 5 Natural C

BND 3, 5, 7 FCIR

BND 3, 5, 6 FCIR RE

BND 3, 5, 8 FCIR (IR2)

Current WV-2 Bundle Data Backdrop Products: Pan-sharpened natural colourPan-sharpened natural colour Pan-sharpened false colour IRPan-sharpened false colour IR Pan-sharpened false colour REPan-sharpened false colour RE Vegetation index red / near IRVegetation index red / near IR Vegetation index red / REVegetation index red / RE

Vinaka

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