1. Orfeo Toolbox
Geometric pre-processing
Stéphane MAY
stephane.may@cnes.fr
orfeo-toolbox.org
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2. Geometric corrections
Goal
Orthorectify images
➢ Transform images from satellite referential to terrestrial referential
Cartographic or geographic projection
➢ Use of the geometrical model
Impact of the geometrical model precision
Superpose images
➢ Superpose images for pan-sharpening, change detection
OTB orthorectification works for :
➢ Spot 5, Ikonos, Quickbird, GeoEye, WorldView
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3. Geometric corrections
Menu Geometry > Reproject Image (1/2)
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4. Geometric corrections
Menu Geometry > Reproject Image (2/2)
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5. Use case 1 : Orthorectify an image without DEM
Menu File > Open
./img_kalideos_reunion/2003-05-04/j_1a/1.0/IMAGERY.TIF
Menu Geometry > Reproject image
UTM / Linear
User defined Parameters :
➢ Longitude : 55.612 Latitude : -21.290
Spacing X : 10, Spacing Y : -10 (m)
Size X : 520, Size Y : 500
File > Save dataset
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6. Use case 1 : Orthorectify an image without DEM
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7. Use case 2 : Orthorectify an image with DEM
Menu File > Open
./img_kalideos_reunion/2003-05-04/j_1a/1.0/IMAGERY.TIF
Menu Geometry > Reproject image
UTM / Linear
User defined Parameters :
➢ Longitude : 55.612 Latitude : -21.290
Spacing X : 10, Spacing Y : -10 (m)
Size X : 520, Size Y : 500
DEM : enter the directory where .hgt files are
File > Save dataset
Visualization > Viewer > Add 2 images and compare
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8. Use case 2b : Orthorectify an image
Use the command line tools
gdalinfo image.tif
otbObtainUTMZoneFromGeoPoint -lat -21.290 -lon 55.612
otbOrthoRectification-cli -in ./img_kalideos_reunion/2003-05-
04/j_1a/1.0/IMAGERY.TIF -out output.tif -ul 978771 7638749 -rpc 10 -size
500 520 -spacing 10 -10 -mapProj UTM 39 S -interp LINEAR
otbConvertGeoToCartoPoint -lat -21.290 -lon 55.612 -mapProj UTM 39 S
otbConvertCartoToGeoPoint -x 978771 -y 7638749 -mapProj UTM 39 S
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9. Monteverdi – Superimpose two images
Menu Geometry > Superimpose two images
Combination of geometrical models of the two images (note : works
only with images with geometrical model)
➢ Image to be superimposed : use of the direct geometrical model to
build Longitude/Latitude projection
➢ Combination with the inverse model of the reference image.
➢ Reprojection
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10. Monteverdi – Superimpose two images
Menu Geometry > Superimpose two images
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11. Use case 3 : Superimpose an image
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12. Use case 3b : Superimpose an image
Use the command line tool
otbSuperimpose-cli -inR img_geom1.tif -inM
../data_formation/img_kalideos_reunion/2004-08-
19/j_1a/1.0/IMAGERY.TIF -out output2.tif
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13. Monteverdi – Manual registration
Menu Geometry > Homologous points extraction
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14. Use case 4 : Manual registration
Menu File > Open
Last 2 ortho images
Menu Geometry > Homologous points extraction
Select homologous points
File > Save dataset
Visualization > Viewer > Add 2 images (2003 and 2004 registered) and
compare
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15. Orfeo Toolbox - Registration
Use command line tools
otbRigidTransformResample-cli -in output2.tif -out output2_tr.tif -tx 150
-ty -90
otbFineRegistration-cli -ref output.tif -sec output2.tif -w output2.tif -out
disparity.tif -wo output2_reg.tif -er 10 10 -mr 9 9 -co 150 -90 -m CC
-spa 0.5 -ssr 10 10
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16. Monteverdi – Build a simple sensor model
Menu Geometry > GCP to sensor model
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17. Use case 5 : P+XS fusion
Menu File > Open
./img_kalideos_reunion/2003-05-04/thr_1a/1.0/IMAGERY.TIF
./img_kalideos_reunion/2003-05-04/j_1a/1.0/IMAGERY.TIF
Menu Geometry
Orthorectification of PAN image over a selected ROI (Region of Interest)
Menu Geometry > Superimpose 2 images
Image to reproject : Reader1 (XS)
Reference image : Projection>OutputImage
Option : DEM : enter the directory where .hgt files are
Filtering > Pan-sharpening > Simple RSC pan sharpening
File > Save dataset
Filtering > Pan-sharpening > Bayesian fusion
File > Save dataset
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Visualization > Viewer > Add 2 images (2 fusions) and compare 17

18. Monteverdi
Thank you for your attention !
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