Image Data Pre-processingfor Pacific Island Countries

Litia Gaunavou

Pre-Processing

• Image Mosaicing

• Haze removal

• Atmospheric correction

• Pan-sharpening

• Ortho-Correction

Image Stitching

Stitched ImageImage Tiles

Haze Removal

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

Atmospheric Correction

View Angle

DEM

Sensor type

Calibration data

Sun angle

Corrected Image

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

Green, Red, Near Infrared

Pan-Sharpening

Red

Green

Blue

PanchromaticImage Data

Blue

Green

RedIntensity

Hue

Saturation Saturation

Hue

Multi-spectral IMG Pan-sharpened IMG

IHS Resolution Merge

Pan-SharpeningHyperspherical Color Space Resolution

Merge

WorldView-2: MS Data WorldView-2 PAN data

Pansharpen_123 Pansharpen_234

Result

Reasons for Bundle

• PanSharpen Natural Colour • PanSharpen False Colour Infrared• Multispectral available for Vegetation

Index• ATCOR can be performed• Orthorectification can be performed

New Satellites, GeoEye-1 & WorldView-2

• High geo-accuracy ~ 5m1. Star tracker2. Advanced GPS position

• Ortho Correction required to activate high geo-accuracy

Ortho Correction

• Orthocorrection requires a DTM• the DTM should have similar scale

as image data

Vinaka!