I am georeferenced SAR image with me. I have captured multispectral image of the same scene from google earth. Then I have georeferenced google earth image using QGIS with SAR image. I am doubtful that procedure I did is nothing but image registration. Am I right or is image registration different than georeferencing in context of satellite images?
Hi
The georeferensing and registration are same thing. You could watch some video instruction about it in youtube:
https://www.youtube.com/watch?v=PHtxbpboDro
https://www.youtube.com/watch?v=cv6ItuMpnyM
https://www.youtube.com/watch?v=BQm1rrvQq84
https://www.youtube.com/watch?v=cAPykiB2YyA
https://www.youtube.com/watch?v=iaTQe9Pif78
Georeferencing means to associate an image with locations in physical space: a coordenate system. Registration uses two or more scenes of the same place, acquired at different dates, allowing a pixel by pixel comparation.
Generally speaking, the registration is the process used to align two or more images by using the same reference system (no matter which one).
Georeferencing assigns some known map coordinates to selected points, in order to position the image in the map coordinate system. It can be performed for each image independently.
For registration, the "local" coordinates of an image are used to identify the reference system of the obtained mosaic.
If you use, as reference image, a satellite scene having map coordinates, the registration process is equivalent to georeferencing.
Registering means determining the relative orientation between images or point clouds. Georreferencing is determining their spatial orientation (exterior or absolute) in relation to a geo (earth) coordinate system
Geometric correction and overlay are not same. To overlay one image over other, both the images are required to be georeferenced.
there is little difference between the two.....
Geo referencing is mandatory registration where it done by GCP( grond reference point) or projected images.
registration is not always with projected images.
for change detection....you can take any image as master and do registeration with respect to others...here objective is to sitting both image perfectly...even though it is not georeferenced.
Minute difference between both: Georeferencing means: image is on actual co-ordinate. Registration means: one image or map for presenting their relative orientation.
Geo Referencing is the standard process of tying and combining imagery data to the relevant control or coordinate system which may be state plane, local, etc. Usually Geo-referencing and registering yield to tie images to the control points.
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