Shape and size

In the area (seen from above): drag it, or its corners; two fingers resize and turn it, or turn it only on two opposite edges. A long press anywhere in it plants the pin: the area turns and grows around it, its round handle turns it with one finger; tap the pin to remove it. Tap the size to type it. Up to 2 km for now. Only « Done » or « Generate 3D » lock it.

Roads and bridges

Terrain and contours

A new spacing is used at the next « Generate 3D ».

Water, greenery, trees

Tap two points in the area to draw a section line.

Measure

Export

The file is made on the phone, then « Share » opens the share sheet (Files, AirDrop, Mail…).

Lab measures

Sources and checks