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Last Post 14 Jan 2009 04:21 AM by anon

Problems georefencing

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anon

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14 Jan 2009 04:21 AM
Hello all My question for today is the following. I am georeferencing Spot images from an hidrography and a road layer. I just want to improve the match since this images are already georeferenced. I am trying the RST and Polynomial degree=1 methods, and the Nearest neighbor and the Bilinear interpolation for the intensity interpolation. When comparing the new images I found that the georefence was different between the nearest nighbor and the Bilinear interpolated images. I was not expecting this result since I thought this two methods had only to do with the pixel values and not its locations... Can someone help me with this.??? Thank you Shaenandhoa García Rangel PhD Candidate

MariM

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15 Jan 2009 08:29 AM
Using the same warp method, are the upper left corner coordinates different or the same with bilinear and NN? Are the output pixel sizes the same? If they are the same, I would think that the georeferencing (the warp grid) is the same and the effect you see is from the resampling method since one is an average and one using the original value. This can make boundary DN values appear to be 'shifted' when they are not.

Deleted User

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16 Jan 2009 03:34 AM
Thank you very muhc for your answer. Everything is indeed the same, thus it must be the visual effect of the average.

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