By default, when using the Model Builder in InfraWorks 360, the included ground imagery comes in at a level 17, which is a resolution of 1.1943 m/pxl [meters per pixel]. This can be upped to a max level of 19 which is a ground resolution of 0.2986 m/pxl.
To make this change, find Ground Imagery under the DATA SOURCES panel and double click, or right-click to configure. Select the Raster tab, and find Bing Maps at the bottom. Use the pull-down to change the resolution:
WARNING: I suggest incremental updates as the size [area] of your model, as well as your network environment will determine how long this update can take. I have had users complain of 20+ hours to finish a lever 19 for a very large model.
Note: You can also turn down the resolution of your model to improve performance. This is especially helpful while laying out your model, and in very large working areas. It can significantly reduce your regen times as well.
Note Note: This imagery data comes from the BING Map servers; you will only get what is currently available via BING Maps.
See it live: https://knowledge.autodesk.com/community/screencast/ea44c378-c7c9-47b0-bad3-14ee2d546d46
Willy Campbell