The QFieldSync plugin helps preparing and packaging QGIS projects for QField.
QFieldSync supports your project preparation with automating the following:
- Required steps for project setup (e.g. :ref:`portable_project`)
- Creating basemaps from a single raster layer or from a style defined in a map theme.
- Configuring the offline editing functionality and synchronizing changes back.
To get a quick overview of the process, here is a list of typical steps:
- Create a QField package. This is a working copy in a separate folder.
- Copy the QField package to the target device.
- Go out and collect data.
- Copy the modified data back to your desktop computer.
- Synchronize the modified data with your database or files.
The project configuration is saved in the master .qgs project file. This way it is possible to pre-configure a project once and use it repeatedly.
In the project configuration dialog, an action can be defined for each layer individually. Depending on the layer type, different types of actions are available.
- The layer will be copied to the package folder. This is only available for file-based layers.
- No action
- The layer source will be left untouched. This is only available for non-file-based layers like WMS, WFS, Postgis...
- Offline editing
- A working copy of the layer is copied into the package folder. Every change which is done in the packaged project during work is recorded in a changelog. When synchronizing the changes back later on, this log will be replayed and all changes also be applied to the main data base. There is no conflict handling in place.
- The layer will be removed from the working copy. This is useful if a layer is used in the basemap and will not be available in the packaged project.
Base map configuration
A base map is a raster layer which is added as the bottommost layer to the packaged project file.
If the base map option is enabled, a base map will be rendered, whenever the project is packaged. The area of interest - the extent which will be rendered - will be chosen at packaging time.
There are two possible sources for a base map:
- A raster layer. This is useful to take an offline copy of an online layer like a WMS or to take a working copy of an unsupported format like an ECW or MrSID layer.
- Map Theme
- A map theme. This is useful to create a base map based on a combination of several layers with styling. These layers can then be removed from the working package and do not need to be rendered on the device. This can save some disk space and battery on the device.
The tile size defines the spatial resolution. It determines the number of map units per pixel. If the map canvas CRS has meters as units and tile size is set to 1, each raster pixel will have a spatial extent of 1x1 m, if it is set to 1000, each raster pixel will have a spatial extent of 1 square kilometer.
Offline editing configuration
If only synchronize features in area of interest is checked, only features which are within the extent of the map canvas as packaging time will be copied to the offline editing working copy.