Initial state

• Our customer Cartophyl / Presta'SCIC, based in French carribean islands Guadeloupe and Martinique
• Land surveying about pesticids in farms, pest control

QGIS project for a given farm :

Initial state

• Each "farm" has its own "datastore" :
  • Postgresql schema for table, fields
  • folder on the filesystem for linked files
• Therefore, the structure for the QGIS project is the same, except the datasource : legend, graduated rendering

Initial state

• Use of Lizmap Web Client to publish their QGIS projects on the web, thanks to QGIS Server
  • opensource
  • same symbology, QGIS layouts, QGIS forms... are published, to their own customers, with login and password
  • https://lizmap.com
  • https://github.com/3liz/lizmap-web-client

Coverage layer/variables

Extent and project properties

Layer properties

And run

• The original layer properties/expressions are saved in the background (in the custom layer properties for PyQGIS geeks here)
• It means that we can always navigate to a different feature (and therefore, re-evaluate all QGIS expressions)
• It changes layer datasources, with your current opened project (similar to atlas preview in a QGIS layout)
  

Bulk generations of projects

• A dynamic output path for the project can be written
• Sub folder is supported

Bulk generations of projects

After a few cups of coffee

Another example

• Use a QGIS expression for the provider filter

Another example

• Use a QGIS expression for the provider filter

Another example

• Use a QGIS expression for the provider filter

Actual version

• Published on https://plugins.qgis.org
• New version is coming soon with some small improvments
• QGIS Processing limitations
• Some "new" project properties and/or layer properties can be added
• Keen to have your feedbacks
• Open to new ideas, like maybe temporal data ?

Lizmap Web Client

• Tight integration, with the Lizmap configuration file
• If the Lizmap configuration file is found on the "main" project,
  the file is copied and adapted

Thank you for your attention !

• Source code : https://github.com/3liz/QgisDynamicLayersPlugin/
• Thanks Cartophyl and Presta'SCIC for this work
• Demos: https://demo.3liz.com
• Email: info@3liz.com / Mastodon: @LizmapForQgis - Coming soon
• Lizmap source code: https://github.com/3liz/lizmap-web-client/
• Watch the replay of the conference yesterday about Lizmap