Post on 03-Jan-2016
description
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!