# How to Add, Edit, Delete Features

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If you are new to Mergin Maps Input, follow our tutorials to get familiar with the app.

Open a project you want to work with in Mergin Maps Input. This can be a project you own or a project that is shared with you, in which case you need to have write permission to add or edit features.

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To be able to transfer your data to your mobile/tablet device, share your project and track changes, you will need to sign up to Mergin Maps.

# Add features

To add a feature, tap the Record button from the bottom panel.

WARNING

A warning will appear when GPS accuracy falls below a threshold. Accuracy thresholds can be changed in Settings.

Surveyed features are added to the active layer, which is shown just above the bottom panel. You can change the active layer by tapping on it and selecting one from the list of editable layers in the project.
active layer

# Capture points

The crosshairs you will see on your map will be used as the recorded location. You can change the position of your point by pinching and dragging the background map. If you want to recenter the map to your current position, tap the GPS button.

To capture your point, press Add Point. A form will open where you can fill in the attributes.

Capturing point

# Capture lines or areas

There are two methods of capturing lines and areas:

  • Using Add point to capture vertices of your line or area:
    Capturing lines

  • Tracking your position using GPS. Long press the GPS button to turn the tracking on and the vertices will be captured automatically based on your position. You can change how often you want to capture a vertex in Line rec. interval in Settings.

    To turn the tracking off, long press the GPS button again.
    GPS tracking

Once you are finished, press Done. If your feature is an area, the shape will be automatically closed by connecting the last and the first vertex.

# Snapping features

since Input 1.6.0

Snapping can be enabled in your Mergin Maps project to make the field survey easier. How to Set Up Snapping will guide you through the snapping options.

If snapping is enabled, the crosshairs will turn purple and snap to vertices (left) or segments (right) of existing features when capturing new features.
input snapping

# Edit attributes and geometry

Tap on a feature and press the edit button. Now you can change the attributes in the form and modify the geometry of features.
Edit button

To edit the geometry of a feature, tap Edit geometry in the bottom panel.

If you are editing a point feature simply adjust the location by panning the map or use GPS in the same manner as when adding new features. Once you are happy with your changes, press Done.

# Edit geometry of lines or areas

since Input 1.8.0

It is also possible to edit the geometry of lines and areas.

Tap on a feature and press the Edit geometry button. The vertices of the feature will be highlighted and you can move or remove them as needed. Press Done to confirm your changes.
Edit

# Redraw geometry of lines or areas

since Input 1.8.0

The existing geometry of lines and areas can also be redrawn.

Tap the Advanced button and select the Redraw option. Now you can record the new geometry using the tools in the bottom panel.

advanced

# Split geometry of lines or areas

since Input 1.6.0

Lines and areas can be split into two or more new features that will keep the same attributes as the original feature.

To split geometry of a feature:

  1. Tap on a feature and press the edit button.
    Edit button

  2. Tap Advanced and select Split geometry
    split geometry

  3. Create the splitting line by adding points. When finished, tap Done
    split geometry

  4. In this case, two individual features are created. Both have the same attributes, except for Feature ID (one feature keeps the original id, the other gets a new one).
    split geometry

# Delete features

If you want to delete the feature, tap on it and press the edit button. Here you have the option to Delete the selected feature.

Edit and delete

# Synchronise changes

Don't forget to upload your changes to Mergin Maps!

Synchronisation in Mergin Maps Input can be done automatically or manually by pressing the sync button. For more details visit Synchronisation in Input.

sync button

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Behind Data Synchronisation contains more information about the synchronisation process in general.

If needed, some files (for example photos) can be excluded from the synchronisation. You can read more about this option in Selective Synchronisation.