Coordinates and measurements

How pins and drawings stay put when you zoom, rotate, and re-export.

Pins and drawings are stored as coordinates normalised to the page (0-1 on each axis), so zoom and device rotation do not move them.

Measurements are calculated against the per-plan scale. If the plan has a known dimension (e.g. a scale bar or a dimensioned line), calibrate once in Plan Settings and all future measurements will be accurate.

PDF pages use Y-up in PDF space; the UI uses Y-down. The app handles the conversion transparently.