| 09 Oct 2009 10:22 AM |
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Hi folks!
It may sound stupid but I cannot find a way to do the following...
I have two remote sensing data cubes, which cover almost the same geographic area, showing some misalignment between them (some shifting and a small difference of spatial resolution). I also have the latitude and longitude information of both images for every pixel. One cube is slightly smaller than the other (601x450 and 604x450).
I would like to project the small image using the coordinates of the other one, so both images will eventually share the same coordinates. Of course the projected cube should be expanded to 604 columns.
I've been looking throughout the "Registration" and "Georeference" menus, but I cannot find a way to do so. "Registration" has some problems regarding edges and the output size, while "Georeference" forces me to use another projection and I would like to keep the original projection of the first image.
I thank you in advance for any help!
Have a good day!
xavi
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Deleted User
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| 12 Oct 2009 03:34 PM |
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Are these images georeferenced in ENVI? If they are, then are they in the same projection, or in different projections? I think it sounds like you may want to look into using the Layer Stacking tool found under Basic Tools > Layer Stacking. Read through the docs for that tool, and see if it meets your needs.
Peg
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Deleted User
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| 13 Oct 2009 02:18 AM |
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Hi Peg,
Thanks for your answer!
Neither image 1 nor image 2 are georeferenced in ENVI. However, I have the corresponding latitude and longitude data for both.
Let "column/line" be the dimensions of image 1. I would like to use these dimensions to project image 2, which represents almost the same terrain but slightly shifted and zoomed. Creating a GLT is not the solution since I then would lose the original dimensions...
The procedure I am looking for should build the output image 2 filling the "blanks" by choosing the spectra which satisfy the latitude and longitude of image 1 for every spatial position. All latitude/longitude combinations of image 1 are within image 2, so building the cube wouldn't be a problem. At worst, some interpolation of the spectra in image 2 may be done to suit the image 1 coordinates better.
Thanks again!
Xavi
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Deleted User
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| 13 Oct 2009 07:47 AM |
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Unless I am misunderstanding the situation, which I very well might be, it sounds like you need to do an image to image registration. You can find tools for this under Map > Registration > Select GCPs: Image to Image or Automatic Registration: Image to Image. The latter automatically finds GCPs between your two images (although you will want to examine and edit them to make sure they're good), which can save you some time.
Peg
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