I'm not a regular GIS user.
I'm trying to extract (save for offline use) topographic maps from a couple different sources, but when I load the extracted file, it's either gray with a pattern of white pixels, or nothing renders at all.
I add the data source, add the source as a layer to the project, then Export --> Save As a GeoTIFF. Create VRT is unticked. The extent is the map canvas. If there's supposed to be a specific resolution specified, then I don't know what that is, but I've been using anywhere between 0.5 and 2. The extents download without issue as far as I can tell, and the sources all render perfectly fine when I stream them directly from the source server. I don't know what I'm doing wrong. Here are a few of the REST/XYZ/WMTS sources I've been using:
- https://basemap.nationalmap.gov/arcgis/rest/services/USGSTopo/MapServer [added as REST]
I've tried exporting raw data and a rendered image. I've tried toying with the resolution. I've tried setting up pyramids, internal and external. My project CRS is EPSG:3857 / Pseudo-Mercator.
What am I doing wrong?