Working on a map that includes a bathymetry layer, SRTM data for hillshade, and an accurate coastline boundary edge. I noticed though that the pixel resolution of SRTM 90m resolution creates visible blocky edges when zoomed in (this screenshot equates to z12/13 in web mercator zoom levels).
This is in Alaska, approx. latitude 57°N.
Are there any cartography or editing techniques I could use to clean this up?
Either in clipping the data or in smoothly transitioning the edges to the coastline?
Another example dataset (not SRTM but a DTM of the same area) overlaps outside the coastline edge, similar problem: