I am attempting to create a predictive model for my study area. I have 10m DEMs which I have merged together using the Mosaic to New Raster tool (Picture 1). I am now trying to use the Slope and Aspect tools on the Merged DEMs. While the tools run successfully, noticeable lines appear after each time I run it (Pictures 2). I can only add two photos, but he Aspect has the same lines in it.
I am at a complete loss. Did I incorrectly merge the DEMs? I went through numerous renditions of merging before finding something that a) didn't completely wash out the terrain, and b) didn't have noticeable merge lines.