I am deploying QGIS 3.6 on Windows 10.

Using the `Raster > Projections > Warp (Reproject) tool`, I need to reproject a single-band, `float32`, GeoTIFF DEM from EPSG:3413 to EPSG:3857.

The output raster must snap to a pre-existing GeoTIFF, also in EPSG:3857.

**PROBLEM:** The tool does not include a snapping option. The tool's help page is silent on snapping, as is a Google search.

There is a curious input section entitled `"Additional Command Line Parameters"`. But again, no guidance.

How to include snapping when reprojecting?

[![Example](https://i.stack.imgur.com/yPnHI.png)](https://i.stack.imgur.com/yPnHI.png)