I have a .dtm terrain file and GeoTIFF aerial which I imported into ConceptStation, but I would also like to use bing/google earth outside the areas where I have no imagery. It doesn't seem like ConceptStation will let me add the dtm and TIFF on top of maps from GeoCoordination services. What's the best way to go about this?
You cannot have a mix of local files and Bing imagery for your 3sm. If you are in the US, I would recommend that you visit https://earthexplorer.usgs.gov/ and download the raster data for the whole area of the project. You can use Conceptstation to download rasters using the Geocoordinate Services, they are saved in a folder on your hard drive. (look in the options for the exact location)Conceptstation will be a mosaic raster assuring that the highest resolution will be visible.