I am looking for suggestions on how to scan the shorelines since curves are not the best data to utilize in these areas? Obviously a single pass around the shoreline is a reasonable solution. With this method, you can adjust the width of your swathes to trim up any extraneous data that falls outside the extents of the shoreline. My question is, could a feature be added to the Sidescan Mosaic module that allowed all Sidescan tracks to be trimmed similar to the way Map Projects are with the isobaths and contours, by adding boundaries (shorelines and islands) and trimming all of the Sidescan data along those boundaries?

If you add the sidescan mosaic output to a map project, you can then use the clip raster to layer feature and use an existing shoreline as the clipping layer. You can also include islands etc as part of the clipping layer.

As a quick followup to my previous reply, this is what I mean:

1. Export your sidescan mosaic to the MBTiles format, with the "add to workspace" option checked.
2. Create a new map project (or use an existing one), and add the image to the project. You can do this by dragging the image from the asset list into the Map View of a project.
3. Create a polygon that you want to use to clip your sidescan mosaic. In this case, I simply created a (very) rough polygon in Google Earth. You could also use a shapefile, if you have one. Import the polygon into a map project using the import layer button:



4. Now open up the layer properties for the mosaic image, check the "Clip image to polygon map layer" option and select your polygon layer from the drop-down list.

5. Turn off visibility for the clipping layer (just uncheck the layer in the layer list).

The image will be clipped:



You could then, if you want, just re-export as an image from the project view, or combine with isobaths, contours etc.

This is perfect. Exactly what I was looking for. I’m sure with practice I will learn little tricks like this, but there isn’t any other platforms to learn about these little features besides the forums. Thanks again!