I have some tiff images that I imported into Acrmap. I georeferenced them and turned them into a image service. Now we re-scanned the same images in color and the pixel size is different. How can I bring the new images in without having to georeference again.
Thanks,
Dave McMillan PLS
David McMillan One approach that should work is by writing a world file. Post Georeferencing you can export your raster and write a world file with georeferencing information. After this you should be able to replace the image. Make sure the extension remains the same.
How do I use the same .tfw file. I have it in the same folder as the new un-referenced image. Then when I bring it in it does not appear to use the world file.
Also my size of my original image is 13520 x 13711 pixels and the new image is 6764 x 6920 pixels.
Would that be a problem?
Thanks,
Dave
Minimum you would need to change values 1 and 4 in the world file because the cell size has changed. Those values (same, but #4 is negative) identify how many meters or feet a pixel represents.
Is the origin the same? If not, you're definitely going to have to georeference the new images.
Melita
dave,
You georeferenced 'same' images; and then re-scan the same images (just different pixel) for re-georerancing.... To me, this practice is not recommendable, especially, in operation.
In fact, you can resample the georeferenced images to the desired pixel (coarse, i.e., 2 m from 0.3 m) by the gp tool 'resample'...