Configuring an export

Before you run an export, you tell the plugin which layers to publish and, for each one, whether to create a new layer in the project or replace an existing one. These choices live in the export dialog and apply to both Export and Preview flows.

Open the dialog

Open the dialog from the Topologis toolbar icon, or from Web → Topologis Exporter → Publish to Topologis....

Pick layers

The top of the dialog is a table of every layer in your current QGIS project. Each row has a checkbox and a layer name. Tick the layers you want to publish.

Only Point, Line, and Polygon vector layers can be published. Raster, mesh, and any other layer types still appear in the list but their rows are disabled and marked with a warning icon. Hovering the row shows the reason.

Supported layers are sorted to the top of the list, so you don’t have to scroll past unsupported ones in projects that have a lot of basemap rasters.

Pick an operation per layer

Next to each checked layer is an Operation dropdown with two choices:

• Replace existing overwrites the contents of the layer that was previously published from this QGIS layer, keeping the existing Topologis layer’s id and any styling, filters, or references attached to it. Pick this when you’ve made edits in QGIS and want them reflected in the same Topologis layer.
• Create new uploads the layer as a brand-new layer in the project. Pick this the first time you publish a given QGIS layer, or when the data has diverged enough that it’s really a different layer.

The dropdown defaults to Replace existing. The first time you publish a QGIS layer, switch it to Create new. After that, you can leave it on Replace existing for ongoing iteration.

Open the map in a browser after export

At the bottom of the dialog is an Open map in browser checkbox. When it’s on, the resulting map view opens in your default browser as soon as the export finishes. It’s on by default, and the setting is remembered between sessions.

Leave it on the first time you try the plugin so you can see the result without hunting for the right view.

What the plugin does with your data

When you click Export (or Preview), each checked layer goes through the same pipeline:

1. The layer is reprojected to EPSG:4326 (WGS84) if it isn’t already in that CRS.
2. It’s written out as GeoJSON.
3. The GeoJSON is uploaded directly to Topologis storage.
4. A processing job is created in the project’s Data tab, which finishes by adding (or replacing) the layer.

Your original QGIS layer is not modified. The upload runs on a worker thread, so QGIS stays usable while it’s in flight.

Next step

Once layers and operations look right, see Exporting for the actual run, or Preview if you don’t have a token yet.