Measurement Tools

• Measure length and area in Mergin Maps mobile app
• Changing measurement units in QGIS

Measure length and area in Mergin Maps mobile app

In the mobile app, it is possible to measure length and area on a map window. Measurement tools use the same units as are used by the QGIS project.

To open the measurement tools, tap the More button in the bottom navigation panel and use the Measure option.

Use the Add Point button to add points along the line or area you want to measure

• The length between added points is displayed in the Measure panel.
• The current length is displayed near the crosshairs as you move them.
• Use the Undo button to remove the last point.
• To get the area, add the points along the shape. When you move the crosshairs close to the first point, you will see the Close shape option.

When finished with the measurements, tap the Done for length measurement or Close shape for area measurement. The values of perimeter and area will be displayed in the Measure panel.

Tap Repeat to start a new measurement.

Measured values are not saved.

Changing measurement units in QGIS

Units that are used when measuring in the mobile app are defined (and can be changed) in the project in QGIS:

1. Open your Mergin Maps project in QGIS
2. Navigate to the General tab in the Project Properties
3. In the Measurements section, change the Units for distance measurement and Units for area measurement to the units you want to use when measuring length and area in the mobile app
4. Save and synchronise your project

For example, here we switched to length units to feet and area units to acres.

Now, the mobile app displays the length/the perimeter in feet and the area in acres.