Nearest neighbor, bilinear and cubic convolution re-sampling produce the same result

[DavidBirkigt]

Hi,

I am re-sampling an aerial image with red green and blue bands (.ecw) with arc 9.3. I understand the differences between re-sampling techniques and was surprised when nearest neighbor, bilinear and cubic convolution produced the same result after re-sampling from .1m to .5m. Attached is a .pdf of a car in the original and resulting image as well as an associated pixel value.

Can anyone shed some light as to why the result was the same?

Thanks

[ErinLatham]

It may be a tricky display thing. I recommend trying to take a difference image with raster calculator between the interpolation methods to see the values change. Sometimes the images do not appear to change due to the raster display options, or even slow caching of the program.

Hope this helps.
Good luck.