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Digitize

QField allows to digitize, edit and delete Points, Lines and Polygons on the field. It also supports snapping.

Collect features

Fieldwork

To start digitizing new features, enable the Edit mode in the main menu (pencil button) and select the layer on which you want to add a new feature (the layer will be highlighted in green).

Points

Navigate the crosshair in the center of the screen to the desired location and click the Plus (+) button at the lower right of the screen to confirm the creation of a new point feature.

You can use the keep centered button to force the crosshair to center on your location if you have enabled the GPS.

Lines and polygons

Navigate the crosshair in the center of the screen to the desired start of the line or polygon and click the Plus (+) button at the lower right of the screen to add the first node.

Proceed with adding points to form you line or polygon by clicking the Plus (+) button each time you want to add a new node.

Click the Minus (-) button to remove the last added node.

Click the Close (x) button to cancel the feature creation completely.

When you have added a least 2 nodes for a line or 3 nodes for a polygon, a Save button will appear. Click on it to finish your sketch.

Attribute form

After digitizing a geometry, the attribute form will be displayed if it is not suppressed and you will be asked to enter the attributes for the new feature. The form which appears allows entering attribute values for the new feature.

Remember attribute values

For quick collection of rather homogeneus datasets, it is crucial to not having to enter the same attribute values over an over. The checkboxes at the right of every attribute allow remembering each attribute individually so that the next time you will add a feature on the same layer, these attributes will be automatically pre-filled.

Edit features

Fieldwork

To edit, tap on Menu button > pencil.

You can edit an existing feature by moving, adding or deleting the vertex and also spliting.

Split tool

It is possible to split an existing geometry by drawing a line where it should be split.

Vertex tool

It is possible to move and delete vertices of geometries and add new ones.

Merge tool

Choose two features on the map, select them in the list and merge them: Menu (⁝) Button > Merge Selected Feature(s)

Demonstration of geometries editing

A video demonstration of some editing possibilities:

Freehand digitizing

The freehand digitizing mode allows you to "draw" lines and polygons using their styluspen or mouse. The mode is available for line / polygon feature additions as well as the geometry editor's rings tool.

The freehand digitizing mode is activated through a new toolbar button which appears when QField is set to editing mode and a line or polygon vector is selected.

Topological Editing

If topological editing is activated on the project QGIS before exporting for QField, shared nodes of neighbouring geometries are modified together when moving / deleting vertices and additional vertices are added to segments when a new node is added from neightbouring geometries.

Multi editing

You can make a multi-selection and edit all the features at the same time. In some cases, it can be very efficient.

Delete features

Fieldwork

Deleting features is only possible in digitize mode.

To delete a feature, identify it first by a short tap on it. Then select it with a long press in the identification list, select further features to delete if you want and click the trash button to confirm the deletion.

Snapping

Desktop preparation

While digitizing new features, new points can be snapped to existing geometries.

All configuration can be done in Project > Snapping Settings

Snapping Types

It is possible to snap new points

  • only to nodes of existing geomtries
  • only to segments of existing geomtries
  • to nodes and segments of existing geomtries

Snapping to layers

It is also possible to only snap to one or a few layers.

Snapping tolerance

The snapping tolerance can be specified in map units or pixels.

In almost any case, the units should be set to pixels. We made good experiences with a tolerance value of 20.

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