I hope someone can help with this mystery. I use gdal2tiles.py to create raster tile-sets, see example image attached. Is this a known issue? And what might be happening here, it occurs right along the tile edge in both directions.
Thanks for any considerations.
Hi @Richard_Hawley,
That’s a fairly common issue under extreme magnification, i.e., when you’re zoomed in very close so each pixel in the image maps to much more than one pixel on the screen. It’s basically an interpolation artifact. Screen pixels within the body of a geometry tile are linearly interpolated from the source image. But on the edge, that’s not possible, because there’s no adjacent pixel to interpolate between. So there’s a hard transition between adjacent tiles. I don’t know of any solution, other than using higher-res imagery or not zooming in so close.
