Annotation Tools — Help Centre

The annotation editor is a full-screen, mobile-optimised tool for marking up survey photos. Open it by tapping any photo in a survey.

Available tools

Arrows

Draw a line from one point to another with an arrowhead. After drawing, enter a label (e.g. "2.4m", "150mm"). Use arrows for linear measurements, directions, and callouts.

How to use: Tap the start point, then drag to the end point. A label input appears automatically.

Angles

Measure a corner or slope with a three-point arc. Tap the vertex first, then each arm endpoint. Enter a label for the measured angle.

How to use: Tap three points — vertex, first arm end, second arm end. A label input appears automatically.

Text labels

Place a text callout anywhere on the photo. Use for notes, descriptions, or labels that don't need a measurement line.

How to use: Tap where you want the label, then type your text.

Freeform drawing

Draw freely on the photo with your finger. Use for highlighting areas, sketching outlines, or marking boundaries.

How to use: Touch and drag to draw. The line follows your finger.

Working with annotations

Select and move — tap the Select tool, then tap an annotation to select it. Drag to reposition.
Delete — select an annotation and tap the delete button.
Change colour — select from the colour palette in the toolbar before drawing.
Undo/Redo — use the undo and redo buttons in the top bar. Up to 20 steps of history are stored.

Touch controls

Single finger — draw or place annotations (in draw mode), or pan the image (in select mode).
Two fingers — pinch to zoom and two-finger pan. Works in any mode.

Saving

Annotations save automatically when you tap Done or navigate back. If you're offline, annotations are queued and sync when you reconnect.

All coordinates are stored as percentages, so annotations display correctly regardless of screen size or orientation.