# Capturing Photos

When surveying, you might want to take a photo from your camera or attach an existing photo from the device gallery to your survey feature.

# Attachment widget in QGIS

TIP

Clone Mergin Maps Project documentation/form_setup documentation/form_setup (opens new window) to follow this example!

To set up a photo widget:

  1. Right-click on a layer, select Properties and go to the Attributes form tab.
  2. In the list of Available Widgets select the text field you want to work with.
  3. In the Widget Display tab:
    • From the drop-down menu, select Attachment
    • Default path defines where images will be saved. If it is not defined, the project home folder will be used.
    • Store the path as Relative to project path or Relative to default path depending on how you want to store the paths.
  4. Apply the changes. Don't forget to save and sync your project!
    photos

Here is an overview of paths that will be stored in various settings of the attachment widget. path/to/project represents the project home folder, where the project file is located.

Default path Store path as Value
- Absolute Path <path/to/project>/image.jpg
- Relative to project path image.jpg
- Relative to default path image.jpg
@project_folder Absolute Path <path/to/project>/image.jpg
@project_folder Relative to project path image.jpg
@project_folder Relative to default path image.jpg
@project_home + '/photos' Absolute Path <path/to/project>/photos/image.jpg
@project_home + '/photos' Relative to project path /photos/image.jpg
@project_home + '/photos' Relative to default path image.jpg

# How to set up a custom folder for storing photos

It can be useful to set up a custom folder for photos, e.g. if you want to use selective synchronisation or if you simply want to have your data organised.

To set up a custom folder:

  1. Create a subfolder in the project folder (here: photos)

  2. Open your project in QGIS

  3. Open the Properties of the survey layer and navigate to the Attributes form tab.
    Select the field, where photos are stored (here: photo) and make sure that the widget type is set to Attachment:
    form

  4. Now we need to change the Default path to the folder we have created. Click on the Data defined override icon and choose Edit...
    edit expression

  5. In Expression String Builder enter the expression @project_folder + '/photos' (replace photos by the name of your folder). Click OK.
    folder expression

  6. The Default path now refers to the custom folder.

  7. Apply the changes. Don't forget to save and sync your project!

# Resizing pictures automatically

Photos that are captured during the field survey or uploaded using Mergin Maps Input can be automatically resized, e.g. to save up storage space. The quality of the photos can be set up in the Mergin Maps project properties using Mergin Maps plugin for QGIS.

# Photos in Mergin Maps Input

Using the photo widget in Mergin Maps Input, you will have two options:

  • Take a photo to use your camera app for taking a photos
  • Add from gallery to attach an existing photo from your device.

photos