This question already has an answer here:
I have a coastal line layer (
us-medium-shoreline from http://shoreline.noaa.gov/data/datasheets/medres.html ), which is loaded into a project with On-The-Fly reprojection ( WGS 84 / World Mercator CRS with
+proj=merc +lon_0=0 +k=1 +x_0=0 +y_0=0 +datum=WGS84 +units=m +no_defs) and I'd like to create a 500m buffer around this shoreline with the ultimate goal of intersecting the shoreline with inland polygons.
I'm expecting a polygon with the coastal line as its center, but I keep getting a circular region as resulting layer (with empty attributes table). Clearly I'm missing something as a GIS newbie.