Survey images & CAD underlays

If you have a survey, you can trace over it instead of (or as well as) the map. Airship accepts both a scanned/exported image and a proper CAD file.

Survey image

Use survey image to load a JP/PNG of a topo or site plan. Set its opacity so you can see your drawing over it, then calibrate the scale (below) and trace the boundary.

CAD underlay (DXF / DWG)

Load a CAD file (DXF, or DWG which is converted automatically) as a true vector underlay. You get:

• Opacity — fade the underlay under your design.
• Units — tell Airship whether the file is in millimetres, metres or feet so it scales correctly.
• Scale (📏) — click two points a known distance apart to set the real-world scale precisely.
• Layers — show or hide individual CAD layers.
• Unload — remove the underlay.

Your drawing tools snap to the CAD linework, so you can trace boundaries and existing features accurately.